2004 Chevrolet Silverado Owners Manual

include the weight of the people inside. But, you can figure about 150 lbs. (68 kg) for each seat. The total cargo load must not be more than your vehicle’s CWR.

4-68

Refer to the Truck-Camper Loading Information label in glove box for dimensions A and B as shown in the following illustration.

Here is an example of proper truck and camper match:

Use the rear edge of the load floor for measurement purposes. The recommended location for the cargo center of gravity is at point C for the CWR. It is the point where the mass of a body is concentrated and, if suspended at that point, would balance the front and rear.

A. Camper Center of Gravity B. Recommended Center of Gravity Location Zone The camper’s center of gravity should fall within the center of gravity zone for your vehicle’s cargo load. You must weigh any accessories or other equipment that you add to your vehicle. Then, subtract this extra weight from the CWR. This extra weight may shorten the center of gravity zone of your vehicle. Your dealer can help you with this. If your slide-in camper and its load weighs less than the CWR, the center of gravity zone for your vehicle may be larger.

4-69

Your dealer can help you make a good vehicle-camper match and help you determine the CWR. After you’ve loaded your vehicle and camper, drive to a weigh station and weigh the front and rear wheels separately. This will tell you the loads on the axles. The loads on the front and rear axles shouldn’t be more than either of the GAWRs. The total of the axle loads should not be more than the GVWR. Open the driver’s door and look at the Certification/Tire label to find out your GAWR and GVWR. If you’ve gone over the weight ratings, move or take out some things until all the weight falls below the ratings. Of course, you should always tie down any loose items when you load your vehicle or camper. When you install and load your slide-in camper, check the manufacturer’s instructions. If you want more information on curb weights, cargo weights, Cargo Weight Rating and the correct center of gravity zone for your vehicle, your dealer can help you. Just ask for a copy of † Consumer Information, Truck-Camper Loading.†

4-70

Trailer Recommendations You must subtract your hitch loads from the CWR for your vehicle. Weigh your vehicle with the trailer attached, so that you won’t go over the GVWR or GAWR. If you are using a weight-distributing hitch, weigh the vehicle without the spring bars in place. You’ll get the best performance if you spread out the weight of your load the right way, and if you choose the correct hitch and trailer brakes. For more information, see TowingaTraileron page4-71.

Pickup Conversion to Chassis Cab General Motors is aware that some vehicle owners may consider having the pickup box removed and a commercial or recreational body installed. Before you do so, first contact GM Customer Assistance for information on such conversions specific to this vehicle. Owners should be aware that, as manufactured, there are differences between a chassis cab and a pickup with the box removed which may affect vehicle safety. The components necessary to adapt a pickup to permit its safe use with a specialized body should be installed by a body builder in accordance with the information available from GM Customer Assistance. See Customer Assistance Offices on page7-4.

To identify the vehicle trailering capacity of your vehicle, you should read the information in “Weight of the Trailer” that appears later in this section. If yours was built with trailering options, as many are, it’s ready for heavier trailers. But trailering is different than just driving your vehicle by itself. Trailering means changes in acceleration, braking, handling, durability and fuel economy. Successful, safe trailering takes correct equipment, and it has to be used properly. That’s the reason for this part. In it are many time-tested, important trailering tips and safety rules. Many of these are important for your safety and that of your passengers. So please read this section carefully before you pull a trailer.

Towing a Trailer

{CAUTION:

If you do not use the correct equipment and drive properly, you can lose control when you pull a trailer. For example, if the trailer is too heavy, the brakes may not work well — or even at all. You and your passengers could be seriously injured. Pull a trailer only if you have followed all the steps in this section. Ask your dealer for advice and information about towing a trailer with your vehicle.

Notice: Pulling a trailer improperly can damage your vehicle and result in costly repairs not covered by your warranty. To pull a trailer correctly, follow the advice in this part, and see your dealer for important information about towing a trailer with your vehicle.

4-71

If You Do Decide To Pull A Trailer Notice: Pulling a fifth-wheel camper with a vehicle that is equipped with the SS trim package could damage the vehicle. Do not pull a fifth-wheel camper with a vehicle equipped with the SS trim package. If you do, here are some important points: • There are many different laws, including speed limit restrictions, having to do with trailering. Make sure your rig will be legal, not only where you live but also where you’ll be driving. A good source for this information can be state or provincial police.

• Consider using a sway control. See “Hitches” later

in this section.

• Don’t tow a trailer at all during the first 500 miles (800 km) your new vehicle is driven. Your engine, axle or other parts could be damaged.

• Then, during the first 500 miles (800 km) that you

tow a trailer, don’t drive over 50 mph (80 km/h) and don’t make starts at full throttle. This helps your engine and other parts of your vehicle wear in at the heavier loads.

4-72

• If you have an automatic transmission, you can tow

in DRIVE (D). You may want to shift the transmission to THIRD (3) or, if necessary, a lower gear selection if the transmission shifts too often, such as under heavy loads and/or hilly conditions. If you have a manual transmission and you are towing a trailer, it’s better not to use the highest gear. See Tow/HaulModeLightonpage3-53.

Three important considerations have to do with weight: • The weight of the trailer • The weight of the trailer tongue • The weight on your vehicle’s tires Tow/Haul Mode Tow/Haul is a feature on automatic transmission equipped vehicles that assists when pulling a heavy trailer or a large or heavy load. The purpose of the Tow/Haul mode is to: • Reduce the frequency and improve the predictability of transmission shifts when pulling a heavy trailer or a large or heavy load.

• Provide the same solid shift feel when pulling a heavy trailer or a large or heavy load as when the vehicle is unloaded.

• Improve control of vehicle speed while requiring less throttle pedal activity when pulling a heavy trailer or a large or heavy load.

Automatic transmission equipped vehicles are provided with a button at the end of the shift lever which when pressed enables Tow/Haul. When the button is pressed, a light on the instrument panel will illuminate to indicate that Tow/Haul has been selected. Tow/Haul may be turned off by pressing the button again, at which time the indicator light on the instrument panel will turn off. The vehicle will automatically turn off Tow/Haul every time it is started. Tow/Haul is designed to be most effective when the vehicle and trailer combined weight is at least 75% of the vehicle’s Gross Combined Weight Rating (GCWR). See “Weight of the Trailer” later in the section. Tow/Haul is most useful under the following driving conditions: • When pulling a heavy trailer or a large or heavy

load through rolling terrain.

• When pulling a heavy trailer or a large or heavy

load in stop and go traffic.

• When pulling a heavy trailer or a large or heavy

load in busy parking lots where improved low speed control of the vehicle is desired.

Operating the vehicle in Tow/Haul when lightly loaded or with no trailer at all will not cause damage. However, there is no benefit to the selection of tow/haul when the vehicle is unloaded. Such a selection when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy. Tow/Haul is recommended only when pulling a heavy trailer or a large or heavy load. Weight of the Trailer How heavy can a trailer safely be? It depends on how you plan to use your rig. For example, speed, altitude, road grades, outside temperature and how much your vehicle is used to pull a trailer are all important. And, it can also depend on any special equipment that you have on your vehicle.

4-73

Use one of the following charts to determine how much your vehicle can weigh, based upon your vehicle model and options. Maximum trailer weight is calculated assuming the driver and one passenger are in the tow vehicle and it has all the required trailering equipment. The weight

of additional optional equipment, passengers and cargo in the tow vehicle must be subtracted from the maximum trailer weight. Above the 5,000 lbs. (2 268 kg) trailer rating, the handling/trailering suspension is required on C-1500 models and the handling/trailering or off-road suspension is required on K-1500 models.

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

C-1500 Regular Cab Short Box (2WD)*

4800 V8 (Auto)

4300 V6 (Auto)

4300 V6 (Manual)

9,000 lbs. (4 082 kg) 9,500 lbs. (4 309 kg) 8,000 lbs. (3 628 kg) 8,500 lbs. (3 855 kg) 11,000 lbs. (4 994 kg) 12,000 lbs. (5 443 kg) 9,000 lbs. (4 082 kg) 10,000 lbs. (4 535 kg) 12,000 lbs. (5 443 kg) 13,000 lbs. (5 897 kg) * Fifth-wheel or gooseneck kingpin weight 15 percent to 25 percent of trailer weight up to 1,500 lbs. (680 kg) maximum.

4,600 lbs. (2 087kg) 5,100 lbs. (2 313kg) 3,600 lbs. (1 633 kg) 4,100 lbs. (1 860 kg) 6,500 lbs. (2 948 kg) 7,500 lbs. (3 401 kg) 4,500 lbs. (2 041 kg) 5,500 lbs. (2 495 kg) 7,500 lbs. (3 401 kg) 8,500 lbs. (3 855 kg)

3.08
3.42
3.08
3.42
3.42
3.73
3.42
3.73
3.42
3.73

4800 V8 (Manual)

5300 V8

4-74

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

C-1500 Extended Cab Short Box (2WD)*

4800 V8 (Auto)

4300 V6 (Auto)

4800 V8 (Manual)

4300 V6 (Manual)

9,500 lbs. (4 309 kg) 10,000 lbs. (4 536 kg) 8,500 lbs. (3 859 kg) 11,000 lbs. (4 990 kg) 12,000 lbs. (5 443 kg) 9,000 lbs. (4 086 kg) 10,000 lbs. (4 540 kg) 12,000 lbs. (5 443 kg) 13,000 lbs. (5 897 kg) 13 000 lbs. (5 897 kg) 14 000 lbs. (6 350 kg) * Fifth-wheel or gooseneck kingpin weight 15 percent to 25 percent of trailer weight up to 1,500 lbs. (680 kg) maximum. **Maximum 8,000 lbs. (3 628 kg) for fifth-wheel or gooseneck. ***Maximum 7,500 lbs. (3 401 kg) for fifth-wheel or gooseneck.

4,700 lbs. (2 133 kg) 5,200 lbs. (2 360 kg) 3,700 lbs. (1 678 kg) 6,100 lbs. (2 769 kg) 7,100 lbs. (3 223 kg) 4,100 lbs. (1 859 kg) 5,100 lbs. (2 313 kg) 7,100 lbs. (3 223 kg) 8,100 lbs. (3 677 kg)** 7,700 lbs. (3 493 kg)*** 8,700 lbs. (3 946 kg)***

3.42
3.73
3.42
3.42
3.73
3.42
3.73
3.42
3.73
3.73
4.10

5300 V8 w/4WS

5300 V8

Vehicle*

Axle Ratio C-1500 Crew Cab Short Box (2WD)*

Maximum Trailer Weight

GCWR

6000 V8

6000 V8 w/4WS

3.73
4.10
3.73
4.10

8,300 lbs. (3 765 kg) 10,300 lbs. (4 672 kg) 8,000 lbs. (3 629 kg) 10,000 lbs. (4 536 kg)

14,000 lbs. (6 350 kg) 16,000 lbs. (7 257 kg) 14,000 lbs. (6 350 kg) 16,000 lbs. (7 257 kg

* Fifth-wheel or gooseneck kingpin weight 15 percent to 25 percent of trailer weight up to 2,500 lbs. (1 133 kg) maximum.

4-75

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

C-1500 Crew Cab (2WD)*

5300 V8

3.42
3.73

6,800 lbs. (3 084 kg) 7,800 lbs. (3 538 kg)

12,000 lbs. (5 443 kg) 13,000 lbs. (5 897 kg)

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

C-1500 Regular Cab Long Box (2WD)*

4800 V8 (Auto)

4300 V6 (Auto)

4300 V6 (Manual)

9,000 lbs. (4 086 kg) 9,500 lbs. (4 313 kg) 8,000 lbs. (3 632 kg) 8,500 lbs. (3 859 kg) 11,000 lbs. (4 994 kg) 12,000 lbs. (5 448 kg) 9,000 lbs. (4 086 kg) 10,000 lbs. (4 540 kg) 12,000 lbs. (5 448 kg) 13,000 lbs. (5 902 kg) * Fifth-wheel or gooseneck kingpin weight 15 percent to 25 percent of trailer weight up to 1,500 lbs. (680 kg) maximum.

4,400 lbs. (1 995 kg) 4,900 lbs. (2 222 kg) 3,400 lbs. (1 542 kg) 3,900 lbs. (1 769 kg) 6,300 lbs. (2 857 kg) 7,300 lbs. (3 311 kg) 4,300 lbs. (1 950 kg) 5,300 lbs. (2 404 kg) 7,300 lbs. (3 311 kg) 8,300 lbs. (3 764 kg)

3.08
3.42
3.08
3.42
3.42
3.73
3.42
3.73
3.42
3.73

4800 V8 (Manual)

5300 V8

4-76

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

C-1500 Extended Cab Long Box (2WD)*

4800 V8 (Auto)

4800 V8 (Manual)

11,000 lbs. (4 994 kg) 12,000 lbs. (5 448 kg) 9,000 lbs. (4 086 kg) 10,000 lbs. (4 540 kg) 12,000 lbs. (5 448 kg) 13,000 lbs. (5 902 kg) * Fifth-wheel or gooseneck kingpin weight 15 percent to 25 percent of trailer weight up to 1,500 lbs. (680 kg) maximum.

5,900 lbs. (2 676 kg) 6,900 lbs. (3 129 kg) 3,900 lbs. (1 769 kg) 4,900 lbs. (2 222 kg) 6,900 lbs. (3 129 kg) 7,900 lbs. (3 583 kg)

3.42
3.73
3.42
3.73
3.42
3.73

5300 V8

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

K-1500 Regular Cab Short Box (4WD)

4300 V6 (Auto)

4800 V8 (Auto)

4300 V6 (Manual)

9,500 lbs. (4 313 kg) 10,000 lbs. (4 540 kg) 8,500 lbs. (3 859 kg) 9,000 lbs. (4 086 kg) 12,000 lbs. (5 448 kg) 13,000 lbs. (5 902 kg) 10,000 lbs. (4 540 kg) 11,000 lbs. (4 994 kg) 13,000 lbs. (5 902 kg) 14,000 lbs. (6 356 kg) * Fifth-wheel or gooseneck kingpin weight 15 percent to 25 percent of trailer weight up to 1,500 lbs. (680 kg) maximum.

4,800 lbs. (2 177 kg) 5,300 lbs. (2 404 kg) 3,800 lbs. (1 724 kg) 4,300 lbs. (1 950 kg) 7,200 lbs. (3 265 kg) 8,200 lbs. (3 719 kg)** 5,200 lbs. (2 359 kg) 6,200 lbs. (2 812 kg) 8,200 lbs. (3 719 kg) 9,200 lbs. (4 173 kg)

3.42
3.73
3.42
3.73
3.73
4.10
3.73
4.10
3.73
4.10

4800 V8 (Manual)

5300 V8

4-77

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

K-1500 Extended Cab Short Box (4WD)*

4800 V8 (Auto)

4800 V8 (Manual)

5300 V8

5300 V8 w/4WS

3.73
4.10
3.73
4.10
3.73
4.10
3.73
4.10

6,800 lbs. (3 084 kg) 7,800 lbs. (3 538 kg)** 4,800 lbs. (2 177 kg) 5,800 lbs. (2 630 kg) 7,800 lbs. (3 538 kg)** 8,800 lbs. (3 991 kg)** 7,400 lbs. (3 356 kg) 8,400 lbs. (3 810 kg)

** Maximum weight 7,700 lbs. (3 492 kg) for fifth-wheel or gooseneck. K-1500 Crew Cab Short Box (4WD)*

6000 V8

6000 V8 w/4WS

3.73
4.10
3.73
4.10

8,000 lbs. (3 629 kg) 10,000 lbs. (4 535 kg) 7,700 lbs. (3 492 kg) 9,700 lbs. (4 399 kg)

12,000 lbs. (5 443 kg) 13,000 lbs. (5 897 kg) 10,000 lbs. (4 535 kg) 11,000 lbs. (4 990 kg) 13,000 lbs. (5 897 kg) 14,000 lbs. (6 350 kg) 13,000 lbs.(5 897 kg) 14,000 lbs. (6 350 kg)

14,000 lbs. (6 350 kg) 16,000 lbs. (7 257 kg) 14,000 lbs. (6 356 kg) 16,000 lbs. (7 264 kg)

* Fifth-wheel or gooseneck kingpin weight 15 percent to 25 percent of trailer weight up to 2,500 lbs. (1 133 kg) maximum.

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

K-1500 Crew Cab (4WD)*

5300 V8

3.73
4.10

7,500 lbs. (3 401 kg) 8,500 lbs. (3 855 kg)

13,000 lbs. (5 897 kg) 14,000 lbs. (6 350 kg)

4-78

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

K-1500 Regular Cab Long Box (4WD)*

4300 V6 (Auto)

4800 V8 (Auto)

4300 V6 (Manual)

9,500 lbs. (4 309 kg) 10,000 lbs. (4 536 kg) 8,500 lbs. (3 855 kg) 9,000 lbs. (4 082 kg) 12,000 lbs. (5 443 kg) 13,000 lbs. (5 897 kg) 10,000 lbs. (4 536 kg) 11,000 lbs. (4 990 kg) 13,000 lbs. (5 897 kg) 14,000 lbs. (6 350 kg) *Fifth-wheel or gooseneck kingpin weight 15 percent to 25 percent of trailer weight up to 1,500 lbs. (680 kg) maximum. **Maximum weight 8,900 lbs. (4 036 kg) for fifth-wheel and gooseneck.

4,600 lbs. (2 086 kg) 5,100 lbs. (2 313 kg) 3,600 lbs. (1 632 kg) 4,100 lbs. (1 859 kg) 7,000 lbs. (3 175 kg) 8,000 lbs. (3 628 kg) 5,000 lbs. (2 267 kg) 6,000 lbs. (2 721 kg) 8,000 lbs. (3 628 kg) 9,000 lbs. (4 082 kg)**

3.42
3.73
3.42
3.73
3.73
4.10
3.73
4.10
3.73
4.10

4800 V8 (Manual)

5300 V8

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

K-1500 Extended Cab Long Box (4WD)*

4800 V8

4800 V8 (Manual)

5300 V8

3.73
4.10
3.73
4.10
3.73
4.10

6,600 lbs. (2 993 kg) 7,600 lbs. (3 447 kg)** 4,700 lbs. (2 133 kg). 5,700 lbs. (2 587 kg) 7,600 lbs. (3 447 kg)** 8,600 lbs. (3 900 kg)**

12,000 lbs. (5 443 kg) 13,000 lbs. (5 897 kg) 10,000 lbs. (4 536 kg) 11,000 lbs. (4 990 kg) 13,000 lbs. (5 897 kg) 14,000 lbs. (6 350 kg)

*Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 1,500 lbs. (680 kg) maximum. **Maximum weight 6,800 lbs (3 084 kg) for fifth-wheel and gooseneck.

4-79

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

Silverado SS 6000 V8

4.10

7,600 lbs. (3 447 kg)

13,000 lbs. (5 897 kg)

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

C-2500 LD (2WD)*

6000 V8

3.73
4.10

8,700 lbs. (3 946 kg) 10,700 lbs. (4 853 kg)

14,000 lbs. (6 356 kg) 16,000 lbs. (7 264 kg)

*Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 2,500 lbs. (1 133 kg) maximum.

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

C-2500 Regular Cab Long Box HD (2WD)* 6000 V8

6.6L V8 Diesel C-2500 Extended Cab Short Box HD (2WD)* 6000 V8

4.10
3.73
4.10
3.73

4.10
3.73
4.10
3.73

10,600 lbs. (4 808 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. ( 5 443 kg)**

10,300 lbs. (4 676 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg)**

16,000 lbs. (7 257 kg) 20,000 lbs. (9 072 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

16,000 lbs. (7 257 kg) 20,000 lbs. (9 072 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

6.6L V8 Diesel *Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 2,500 lbs. (1 133 kg) maximum.

8100 V8

8100 V8

4-80

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

C-2500 Extended Cab Long Box HD (2WD)* 6000 V8

8100 V8

8100 V8

6.6L V8 Diesel C-2500 Crew Cab Short Box HD (2WD)** 6000 V8

10,200 lbs. (4 626 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg)**

16,000 lbs. (7 257 kg) 20,000 lbs. (9 072 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

10,000 lbs. (4 536 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg)

16,000 lbs. (7 257 kg) 20,000 lbs. (9 072 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

6.6L V8 Diesel *Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 2,500 lbs. (1 133 kg) maximum.

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

C-2500 Crew Cab Long Box HD (2WD) 6000 V8

8100 V8

6.6L V8 Diesel *Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 2,500 lbs. (1 133 kg) maximum.

10,000 lbs. (4 536 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg)**

16,000 lbs. (7 257 kg) 20,000 lbs. (9 072 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

4.10
3.73
4.10
3.73

4.10
3.73
4.10
3.73

4.10
3.73
4.10
3.73

4-81

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

K-2500 LD (4WD)*

6000 V8

3.73
4.10

8,300 lbs. (3 765 kg) 10,300 lbs. (4 672 kg)

14,000 lbs. (6 350 kg) 16,000 lbs. (7 257 kg)

*Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 2,500 lbs. (1 133 kg) maximum.

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

K-2500 Regular Cab Long Box HD (4WD)* 6000 V8

8100 V8

6.6L V8 Diesel *Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 2,500 lbs. (1 133 kg) maximum.

10,300 lbs. (4 672 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg)

16,000 lbs. (7 257 kg) 20,000 lbs. (9 072 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

K-2500 Extended Cab Short Box HD (4WD)* 6000 V8

8100 V8

6.6L V8 Diesel *Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 2,500 lbs. (1 133 kg) maximum.

10,100 lbs. (4 581 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg)

16,000 lbs. (7 257 kg) 20,000 lbs. (9 072 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

4.10
3.73
4.10
3.73

4.10
3.73
4.10
3.73

4-82

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

K-2500 Extended Cab Long Box HD (4WD)** 6000 V8

8100 V8

8100 V8

6.6L V8 Diesel K-2500 Crew Cab Short Box HD (4WD)* 6000 V8

9,900 lbs. (4 490 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg)

16,000 lbs. (7 257 kg) 20,000 lbs. (9 072 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

9,900 lbs. (4 490 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg)

16,000 lbs. (7 257 kg) 20,000 lbs. (9 072 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

6.6L V8 Diesel *Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 2,500 lbs. (1 133 kg) maximum.

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

K-2500 Crew Cab Long Box HD (4WD) 6000 V8

8100 V8

6.6L V8 Diesel * Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 2,500 lbs. (1 133 kg) maximum.

9,700 lbs. (4 399 kg) 12,000 lbs. (5 443kg) 12,000 lbs. (5 443kg) 12,000 lbs. (5 443kg)

16,000 lbs. (7 257 kg) 20,000 lbs. (9 072 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

4.10
3.73
4.10
3.73

4.10
3.73
4.10
3.73

4.10
3.73
4.10
3.73

4-83

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

4.10
4.10
3.73

9,800 lbs. (4 445 kg)

C-3500 Extended Cab (2WD) 6000 V8
8100 V8
6.6L V8 Diesel C-3500 Crew Cab (2WD)* 6000 V8
8100 V8
6.6L V8 Diesel *Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 3,500 lbs. (1 587 kg) maximum. ** Limited to 12,000 lbs. (5 443 kg) with weight distributing hitch.

16,000 lbs. (7 257 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

16,000 lbs. (7 257 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

15,400 lbs. (6 985 kg)** 15,200 lbs. (6 894 kg)**

15,200 lbs. (6 894 kg)** 15,000 lbs. (6 803 kg)**

9,600 lbs. (4 354 kg)

4.10
4.10
3.73

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

K-3500 Regular Cab (4WD) 6000 V8 Dual Rear Wheel 6000 V8 Single Rear Wheel 8100 V8 Dual Rear Wheel 8100 V8 Single Rear Wheel 6.6L V8 Dual Rear Wheel 6.6L V8 Single Rear Wheel

4.10
4.10
4.10
4.10
3.73
3.73

9,900 lbs. (4 490 kg) 10,100 lbs. (4 581 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg)

16,000 lbs. (7 257 kg) 16,000 lbs. (7 257 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

4-84

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

4.10
4.10
4.10
4.10

K-3500 Extended Cab (4WD)* 6000 V8 Dual Rear Wheel 6000 V8 Single Rear Wheel 8100 V8 Dual Rear Wheel 8100 V8 Single Rear Wheel 6.6L V8 Diesel Dual Rear Wheel 6.6L V8 Diesel Single Rear Wheel * Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 3,500 lbs. (1 587 kg) maximum.

16,000 lbs. (7 257 kg) 16,000 lbs. (7 257 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg)

9,500 lbs. (4 309 kg) 9,700 lbs. (4 399 kg) 12,000 lbs. (5 443 kg) 12,000 lbs. (5 443 kg)

12,000 lbs. (5 443 kg)

12,000 lbs. (5 443 kg)

22,000 lbs. (9 979 kg)

22,000 lbs. (9 979 kg)

3.73

3.73

Vehicle*

Axle Ratio

Maximum Trailer Weight

GCWR

4.10

9,300 lbs. (4 218 kg)

K-3500 Crew Cab (4WD)* 6000 V8 Dual Rear Wheel 6000 V8 Single Rear Wheel 8100 V8 Dual Rear Wheel 6.6L V8 Diesel Single Rear Wheel *Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 3,500 lbs. (1 587 kg) maximum.

12,000 lbs. (5 443 kg)

12,000 lbs. (5 443 kg)

22,000 lbs. (9 979 kg)

22,000 lbs. (9 979 kg)

16,000 lbs. (7 264 kg)

16,000 lbs. (7 264 kg)

9,500 lbs. (4 309 kg)

4.10

4.10

3.73

4-85

The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and trailer including any passengers, cargo, equipment and conversions. The GCWR for your vehicle should not be exceeded. You can ask your dealer for our trailering information or advice, or you can write us at the address listed in your Warranty and Owner Assistance Information Booklet. In Canada, write to:

General Motors of Canada Limited Customer Communications Centre, 163-005
1908 Colonel Sam Drive Oshawa, Ontario L1H 8P7

Weight of the Trailer Tongue The tongue load (A) of any trailer is an important weight to measure because it affects the total or gross weight of your vehicle. The Gross Vehicle Weight (GVW) includes the curb weight of the vehicle, any cargo you may carry in it, and the people who will be riding in the vehicle. If you have a lot of options, equipment, passengers or cargo in your vehicle, it will reduce the tongue weight your vehicle can carry, which will also reduce the trailer weight your vehicle can tow. And if you will tow a trailer, you must add the tongue load to the GVW because your vehicle will be carrying that weight, too. See LoadingYourVehicleonpage4-57
for more information about your vehicle’s maximum load capacity.

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Fifth wheel or gooseneck kingpin weight should be 15 to 25 percent of the trailer weight up to the maximum amount specified in the trailering chart for your vehicle. See “Weight of theTrailer”, and “Fifth-Wheel and Gooseneck Trailering” in this section. Do not exceed the maximum allowable tongue weight for your vehicle. Choose the shortest hitch extension that will position the hitch ball closest to the vehicle. This will help reduce the effect of trailer tongue weight on the rear axle. After you have loaded the trailer, weigh the trailer and then the tongue separately, to see if the weights are proper. If they are not, you may be able to get them right by moving some items around in the trailer. Total Weight on Your Vehicle’s Tires Be sure your vehicle’s tires are inflated to the upper limit for cold tires. You’ll find these numbers on the Certification label at the rear edge of the driver’s door or see Loading Your Vehicle for more information. Then be sure you don’t go over the GVW limit for your vehicle, or the GAWR, including the weight of the trailer tongue. If you use a weight distributing hitch, make sure you don’t go over the rear axle limit before you apply the weight distribution spring bars.

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The trailer tongue weight (A) should be 10 percent to 15 percent of the total loaded trailer weight, up to a maximum or 600 lbs. (272 kg) for the 1500 series, and up to a maximum of 600 lbs. (272 kg) for the 2500 series with a weight carrying hitch. The trailer tongue weight (A) should be 10 percent to 15 percent of the total loaded trailer weight, up to a maximum of 1,000 lbs. (453 kg) for the 1500 series and up to a maximum of 1,500 lbs. (680 kg) for the 2500 series with a weight distributing hitch.

Hitches It’s important to have the correct hitch equipment. Crosswinds, large trucks going by and rough roads are a few reasons why you’ll need the right hitch. Weight Distributing Hitches and Weight Carrying Hitches

A: Body to Ground Distance

B: Front of Vehicle

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When using a weight-distributing hitch, the hitch must be adjusted so the distance (A) remains the same both before and after coupling the trailer to the tow vehicle. If you use a step-bumper hitch, the bumper could be damaged in sharp turns. Make sure there is ample room when turning to avoid contact between the trailer and the bumper. If you will be pulling a trailer that, when loaded, will weigh more than 5,000 lbs (2 270 kg) be sure to use a properly mounted weight-distributing hitch and sway control of the proper size. This equipment is very important for proper vehicle loading and good handling when driving. Always use a sway control if the trailer will weigh more than these limits. You can ask a hitch dealer about sway controls. Fifth Wheel and Gooseneck Trailering Fifth wheel and gooseneck trailers can be used with many pickup models. These trailers place a larger percentage of the weight (kingpin weight) on the tow vehicle than conventional trailers. Make sure this weight does not cause the vehicle to exceed GAWR or GVWR. Fifth wheel or gooseneck kingpin weight should be 15 to 25 percent of the trailer weight up to the maximum amount specified in the trailering chart for your vehicle. See “Weight of the Trailer” in this section for more information.

The hitch should be located in the pickup bed so that it’s centerline is over or slightly in front of the rear axle. Take care that it is not so far forward that it will contact the back of the cab in sharp turns. This is especially important for short box pickups. Trailer pin box extensions and sliding fifth wheel hitch assemblies can help this condition. There should be at least six inches of clearance between the top of the pickup box and the bottom of the trailer shelf that extends over the box. Make sure the hitch is attached to the tow vehicle frame rails. Do not use the pickup box for support. Safety Chains You should always attach chains between your vehicle and your trailer. Cross the safety chains under the tongue of the trailer to help prevent the tongue from contacting the road if it becomes separated from the hitch. Instructions about safety chains may be provided by the hitch manufacturer or by the trailer manufacturer. If you are towing a trailer up to 5,000 lbs. (2 271 kg) with a factory-installed step bumper, you may attach the safety chains to the attaching points on the bumper. If you are towing a trailer up to your vehicle’s trailer rating limit you may attach the safety chains to the attaching point on the hitch platform. If you

are towing with an aftermarket hitch follow the trailer or hitch manufacturer’s recommendation for attaching safety chains. Always leave just enough slack so you can turn with your rig. Never allow safety chains to drag on the ground. Trailer Brakes If your trailer weighs more than 2,000 lbs. (900 kg) loaded, then it needs its own brakes – and they must be adequate. Be sure to read and follow the instructions for the trailer brakes so you’ll be able to install, adjust and maintain them properly. Your trailer brake system can tap into the vehicle’s hydraulic brake system only if: • The trailer parts can withstand 3,000 psi

(20 650 kPa) of pressure.

• The trailer’s brake system will use less than

0.02 cubic inch (0.3 cc) of fluid from your vehicle’s master cylinder. Otherwise, both braking systems won’t work well. You could even lose your brakes. If everything checks out this far, make the brake tap at the port on the master cylinder that sends the fluid to the rear brakes. But don’t use copper tubing for this. If you do, it will bend and finally break off. Use steel brake tubing.

4-89

Driving with a Trailer

{CAUTION:

If you have a rear-most window open and you pull a trailer with your vehicle, carbon monoxide (CO) could come into your vehicle. You can not see or smell CO. It can cause unconsciousness or death. See Engine Exhaustonpage2-51. To maximize your safety when towing a trailer:

• Have your exhaust system inspected for leaks, and make necessary repairs before starting on your trip.

• Keep the rear-most windows closed. • If exhaust does come into your vehicle through a window in the rear or another opening, drive with your front, main heating or cooling system on and with the fan on any speed. This will bring fresh, outside air into your vehicle. Do not use the climate control setting for maximum air because it only recirculates the air inside your vehicle. See ClimateControlSystem onpage3-20.

4-90

Towing a trailer requires a certain amount of experience. Before setting out for the open road, you’ll want to get to know your rig. Acquaint yourself with the feel of handling and braking with the added weight of the trailer. And always keep in mind that the vehicle you are driving is now a good deal longer and not nearly as responsive as your vehicle is by itself. Before you start, check all trailer hitch parts and attachments, safety chains, electrical connector, lamps, tires and mirror adjustment. If the trailer has electric brakes, start your vehicle and trailer moving and then apply the trailer brake controller by hand to be sure the brakes are working. This lets you check your electrical connection at the same time. During your trip, check occasionally to be sure that the load is secure, and that the lamps and any trailer brakes are still working. While towing a trailer or when exposed to long periods of sunshine, the floor of the truck bed may become very warm. Avoid putting items in the truck bed that might be affected by high ambient temperatures. Following Distance Stay at least twice as far behind the vehicle ahead as you would when driving your vehicle without a trailer. This can help you avoid situations that require heavy braking and sudden turns.

Passing You’ll need more passing distance up ahead when you’re towing a trailer. And, because you’re a good deal longer, you’ll need to go much farther beyond the passed vehicle before you can return to your lane. Backing Up Hold the bottom of the steering wheel with one hand. Then, to move the trailer to the left, just move that hand to the left. To move the trailer to the right, move your hand to the right. Always back up slowly and, if possible, have someone guide you. Making Turns Notice: Making very sharp turns while trailering could cause the trailer to come in contact with the vehicle. Your vehicle could be damaged. Avoid making very sharp turns while trailering. When you’re turning with a trailer, make wider turns than normal. Do this so your trailer won’t strike soft shoulders, curbs, road signs, trees or other objects. Avoid jerky or sudden maneuvers. Signal well in advance.

Turn Signals When Towing a Trailer The arrows on your instrument panel will flash whenever you signal a turn or lane change. Properly hooked up, the trailer lamps will also flash, telling other drivers you’re about to turn, change lanes or stop. When towing a trailer, the arrows on your instrument panel will flash for turns even if the bulbs on the trailer are burned out. Thus, you may think drivers behind you are seeing your signal when they are not. It’s important to check occasionally to be sure the trailer bulbs are still working. Driving On Grades Reduce speed and shift to a lower gear before you start down a long or steep downgrade. If you don’t shift down, you might have to use your brakes so much that they would get hot and no longer work well. If you have an automatic transmission, you can tow in DRIVE (D). You may want to shift the transmission to lower gear selection if the transmission shifts too often (e.g., under heavy loads and/or hilly conditions). You may also want to activate the tow/haul mode if the transmission shifts too often. See Tow/HaulMode Light on page3-53.

4-91

If you have a 5-speed manual transmission and you are towing a trailer, it’s better not to use FIFTH (5) gear. Just drive in FOURTH (4) gear (or, as you need to, a lower gear). If you have a 6-speed manual transmission and you are towing a trailer, it’s better not to use SIXTH (6) gear. Drive in FIFTH (5) gear (or, as you need to, a lower gear). When towing at high altitude on steep uphill grades, consider the following: Engine coolant will boil at a lower temperature than at normal altitudes. If you turn your engine off immediately after towing at high altitude on steep uphill grades, your vehicle may show signs similar to engine overheating. To avoid this, let the engine run while parked, preferably on level ground, with the automatic transmission in PARK (P) for a few minutes before turning the engine off. For manual transmissions, let the engine run while parked, preferably on level ground, with the transmission out of gear and the parking brake applied, for a few minutes before turning the engine off. If you do get the overheat warning, see EngineOverheatingonpage5-35.

Parking on Hills

{CAUTION:

You really should not park your vehicle, with a trailer attached, on a hill. If something goes wrong, your rig could start to move. People can be injured, and both your vehicle and the trailer can be damaged.

But if you ever have to park your rig on a hill, here’s how to do it: 1. Apply your regular brakes, but don’t shift into

PARK (P) yet for an automatic transmission, or into gear for a manual transmission.

2. Have someone place chocks under the trailer

wheels.

3. When the wheel chocks are in place, release the regular brakes until the chocks absorb the load.

4. Reapply the regular brakes. Then apply your parking brake and shift into PARK (P) for an automatic transmission, or REVERSE (R) for a manual transmission.

4-92

5. If you have a four-wheel-drive vehicle, be sure the

transfer case is in a drive gear and not in NEUTRAL.

6. Release the regular brakes.

{CAUTION:

It can be dangerous to get out of your vehicle if the shift lever is not fully in PARK (P) with the parking brake firmly set. Your vehicle can roll. If you have left the engine running, the vehicle can move suddenly. You or others could be injured. To be sure your vehicle will not move, even when you are on fairly level ground, use the steps that follow. Always put the shift lever fully in PARK (P) with the parking brake firmly set. If the transfer case on four-wheel-drive vehicles is in NEUTRAL, your vehicle will be free to roll, even if your shift lever is in PARK (P). So, be sure the transfer case is in a drive gear — not in NEUTRAL.

When You Are Ready to Leave After Parking on a Hill 1. Apply your regular brakes and hold the pedal down

while you: • Start your engine • Shift into a gear • Release the parking brake

2. Let up on the brake pedal. 3. Drive slowly until the trailer is clear of the chocks. 4. Stop and have someone pick up and store the

chocks.

Maintenance When Trailer Towing Your vehicle will need service more often when you’re pulling a trailer. See ScheduledMaintenanceon page6-4for more information. Things that are especially important in trailer operation are automatic transmission fluid (don’t overfill), engine oil, axle lubricant, belt, cooling system and brake system. Each of these is covered in this manual, and the Index will help you find them quickly. If you’re trailering, it’s a good idea to review these sections before you start your trip. Check periodically to see that all hitch nuts and bolts are tight.

4-93

Trailer Wiring Harness Your vehicle is equipped with one of the following wiring harnesses for towing a trailer or hauling a slide-in camper. Basic Trailer Wiring All regular, extended cab crew cab pickups have a six-wire trailer towing harness.

The six-wire harness contains the following trailer circuits: • Yellow: Left Stop/Turn Signal • Dark Green: Right Stop/Turn Signal • Brown: Taillamps • White: Ground • Light Green: Back-up Lamps • Light Blue: Center High-Mounted

Stoplamp (CHMSL)

If you need to upgrade your trailer wiring harness, an additional 2–wire harness and 7 pin universal trailer connector are available from your dealer.

The six-wire harness is located at the rear of the vehicle and is tied to the vehicle’s frame. The harness requires the installation of a trailer-wiring harness connector, which is available through your dealer.

4-94

Heavy-Duty Trailer Wiring Harness Package

Your pickup may be equipped with the eight-wire trailer towing harness. This harness with a seven-pin universal trailer connector is attached to a bracket on the hitch platform. * The Center High-Mounted Stoplamp (CHMSL) wire is tied next to the trailer wiring harness for use with a trailer, slide-in camper or cap.

The eight-wire harness contains the following trailer circuits: • Yellow: Left Stop/Turn Signal • Dark Green: Right Stop/Turn Signal • Brown: Taillamps • White: Ground • Light Green: Back-up Lamps • Light Blue: CHMSL • Red: Battery Feed • Dark Blue: Trailer Brake If your trailer is equipped with electric brakes, you can get a jumper harness (electric trailer brake control) with a trailer battery feed fuse from your dealer. If you need to tow a light-duty trailer with a standard four-way round pin connector you can also get an adapter from your dealer.

4-95

Camper/Fifth-Wheel Trailer Wiring Package The eight-wire camper harness is located under the front edge of the pickup box on the driver’s side of the vehicle, attached to the frame bracket. A connector will have to be added to the wiring harness which connects to the camper. The eight-wire harness contains the following camper/trailer circuits: • Yellow: Left Stop/Turn Signal • Dark Green: Right Stop/Turn Signal • Brown: Taillamps • White: Ground • Light Green: Back-up Lamps • Light Blue: Center High-Mounted

Stoplamp (CHMSL) • Red: Battery Feed • Dark Blue: Trailer Brake

4-96

If your vehicle is equipped with the “Heavy-Duty Trailering† option, please refer to Heavy-DutyTrailer WiringPackage, earlier in this section. When the camper-wiring harness is ordered without the heavy-duty trailering package, an eight-wire harness with a seven-pin connector and separate CHMSL connector are located at the rear of the vehicle and are tied to the vehicle’s frame.

Instrument Panel Jumper Wiring Harness

{CAUTION:

Be sure to use only the correct trailer brake harness, the one intended for use on your vehicle. If you use some other trailer brake harness, even if it seems to fit, your trailer brakes may not work at all. You could have a crash in which you or others could be injured. Use only the trailer brake harness intended for your vehicle. If it is no longer available to you, be sure to get a proper replacement from your dealer.

This harness is included with your vehicle as part of the heavy-duty trailer wiring package. This harness is for an electric brake controller and includes a trailer battery feed fuse. It should be installed by your dealer or a qualified service center.

4-97

Four-Wire Harness Adapter

This adapter is included with your vehicle as part of the heavy-duty trailer wiring package.

Use this adapter to connect a standard four-way round pin connector to the seven-wire harness on your vehicle.

Connect the adapter with the tab pointing up (see arrow). The flip cap on the vehicle’s seven-wire harness will lock onto the tab and help hold the adapter in place. Plug the four-way round pin connector onto the adapter.

4-98

Auxiliary Battery The auxiliary battery provision can be used to supply electrical power to additional equipment that you may choose to add, such as a slide-in camper.

If your vehicle has this provision, this relay will be located on the passenger’s side of the vehicle, next to the auxiliary battery.

When using this provision, connection should only be made to the upper stud (A) of the relay. Do not make connections to the lower stud (B) of the relay. The auxiliary battery circuit is protected by a megafuse located behind the auxiliary battery. Be sure to follow the proper installation instructions that are included with any electrical equipment that you install.

Notice: Leaving electrical equipment on for extended periods will drain the battery. Always turn off electrical equipment when not in use and do not use equipment that exceeds the maximum amperage rating for the auxiliary battery provision. Power Winches If you wish to use a power winch on your vehicle, only use it when your vehicle is stationary or anchored.

Power Take-Off (PTO) Before using a PTO, if equipped, refer to the manufacturer’s or installer’s instructions. To engage a PTO on a vehicle with a manual transmission do the following: 1. Hold the clutch pedal down. 2. Set the parking brake. 3. Shift the transmission into NEUTRAL (N). 4. Engage the PTO. Refer to the manufacturer’s

or installer’s for instructions on electrically engaged PTOs.

5. For mobile operations, shift the transmission into the gear you want, apply the regular brakes and release the parking brake. For stationary operations, leave the parking brake applied.

4-99

6. Release the clutch and regular brakes as you normally would. When the clutch is released, the PTO will start.

7. Turn the PTO rotary switch to ON. To engage a PTO on a vehicle with an automatic transmission do the following: 1. For stationary use shift the transmission into

PARK (P).

2. Turn the PTO rotary switch ON. 3.

If the engine speed is below the PTO engage speed limit, the PTO will start. The blinking LED on the PTO control switch indicates PTO engage is requested. When PTO engages the LED will switch from blinking to a steady light.

To use PTO speed control in Preset Mode (Factory Setting) do the following: 1. Engage the PTO 2. Select PARK (P) or NEUTRAL (N) range. Apply the parking brake if NEUTRAL (N) is selected. Torque Converter Clutch (TCC) is not available in NEUTRAL (N) and is available only in PARK (P) when engine speed is above 1,100 rpm.

3. Make sure your foot is off the brake pedal (and off

the clutch on vehicles equipped with a manual transmission).

4. Select the desired engine speed for PTO operation.

Read the following preset mode information regarding operation.

Preset Mode: PTO speed control mode is used for stationary applications. (PTO will remain engaged while mobile in the preset mode, however PTO set and resume speed controls will be inoperative). This mode provides a default standby speed of 800 or 850 rpm (depending on the engine/transmission combination) and two default PTO control speeds which follow: 1. PTO Set Speed of 1,250 rpm, or 2. PTO Resume Speed of 1,700 rpm. Please note that the standby speed (800/850 rpm) is not to be used as a PTO control speed. Vehicles not equipped with cruise control will not have the resume speed capability.

4-100

To use PTO speed control in variable mode (while mobile) do the following: 1. Engage the PTO. 2. Vehicle speed must be greater than 5 mph. 3. Make sure your foot is off the brake pedal (and off

the clutch for vehicles equipped with a manual transmission).

To use PTO speed control in variable mode (while stationary) do the following: 1. Engage the PTO. 2. Vehicle speed must be less than 5 mph. 3. Make sure your foot is off the brake pedal (and off

the clutch for vehicles equipped with a manual transmission).

4. Select the desired engine speed by using the foot

pedal, and select SET on the PTO switch or the cruise control.

4. Select the desired engine speed by using the foot

pedal, and select SET on the PTO switch or the cruise control.

4-101

Step-Bumper Pad Your vehicle has a rear step bumper with a rear step pad at the center of the bumper.

If you will be using the bumper to tow a trailer, and your step-bumper has three cutout circles, you must push out the center cutout circle to install the trailer ball.

If your step-bumper has only one cutout circle, you will have to cut out the circle, then remove it to install the trailer ball.

Variable Mode: PTO speed control mode can be used for both stationary and mobile applications. This mode allows PTO to be controlled in a fashion similar to how cruise control sets vehicle speed. The operator can set to an rpm (between 800 and 2,200) with the cruise control feature or with the SET position on the PTO switch. The operator is then able to increase rpm in increments of 100, or † tap up† with the resume position on the cruise control. Or, the operator can decrease rpm in increments of 100 with the SET switch on the PTO or the cruise control. Vehicles not equipped with cruise control will not have the “tap up” capability. All engine speed values listed above are factory preset values. With the exception of the TCC lockup speed (1,100 rpm) and the “tap† of these values are programmable and can be adjusted by your dealer or body upfitter. If the PTO software settings do not match the settings shown here, then they may have already been altered in order to satisfy the requirements of the installed PTO system and body equipment. When the PTO switch is turned on, the engine is limited to 2200 rpms. If there are no accessories installed on the vehicle, make sure the PTO switch is turned off.

increment (100 rpm), all

4-102

Section 5

Service and Appearance Care

Service ............................................................5-3
Doing Your Own Service Work .........................5-3
Adding Equipment to the Outside of Your

Vehicle ......................................................5-4
Fuel ................................................................5-4
Gasoline Octane ............................................5-4
Gasoline Specifications ....................................5-5
California Fuel ...............................................5-5
Additives .......................................................5-6
Fuels in Foreign Countries ...............................5-7
Filling Your Tank ............................................5-7
Filling a Portable Fuel Container .......................5-9
Checking Things Under the Hood ....................5-10
Hood Release ..............................................5-10
Engine Compartment Overview .......................5-12
Engine Oil ...................................................5-17
Engine Air Cleaner/Filter ................................5-22
Automatic Transmission Fluid (Except

Allison Transmission®) ................................5-24

Automatic Transmission Fluid

(Allison Transmission®) ...............................5-27
Manual Transmission Fluid .............................5-30
Hydraulic Clutch ...........................................5-31
Engine Coolant .............................................5-32
Coolant Surge Tank Pressure Cap ..................5-34
Engine Overheating .......................................5-35

Cooling System ............................................5-38
Engine Fan Noise .........................................5-43
Power Steering Fluid .....................................5-44
Windshield Washer Fluid ................................5-45
Brakes ........................................................5-47
Battery ........................................................5-50
Jump Starting ...............................................5-51
All-Wheel Drive ..............................................5-57
Rear Axle .......................................................5-58
Four-Wheel Drive ............................................5-58
Noise Control System .....................................5-61

Tampering with Noise Control System

Prohibited .................................................5-61
Bulb Replacement ..........................................5-62
Halogen Bulbs ..............................................5-62
Headlamps ..................................................5-63
Front Turn Signal, Sidemarker and

Daytime Running Lamps .............................5-64
Roof Marker Lamps ......................................5-65
Center High-Mounted Stoplamp (CHMSL)

and Cargo Lamp .......................................5-67

Pickup Box Identification and Fender

Marker Lamps ...........................................5-68
Taillamps .....................................................5-69
Replacement Bulbs .......................................5-71

5-1

Section 5

Service and Appearance Care

Windshield Wiper Blade Replacement ..............5-72
Tires ..............................................................5-73
Inflation - Tire Pressure .................................5-81
Dual Tire Operation .......................................5-82
Tire Inspection and Rotation ...........................5-83
When It Is Time for New Tires .......................5-85
Buying New Tires .........................................5-86
Uniform Tire Quality Grading ..........................5-87
Wheel Alignment and Tire Balance ..................5-88
Wheel Replacement ......................................5-88
Tire Chains ..................................................5-90
If a Tire Goes Flat ........................................5-91
Changing a Flat Tire .....................................5-92
Spare Tire .................................................5-112
Appearance Care ..........................................5-112
Cleaning the Inside of Your Vehicle ...............5-113
Care of Safety Belts ....................................5-115

Weatherstrips .............................................5-115
Cleaning the Outside of Your Vehicle .............5-116
Sheet Metal Damage ...................................5-118
Finish Damage ...........................................5-119
Underbody Maintenance ...............................5-119
Chemical Paint Spotting ...............................5-119
Vehicle Care/Appearance Materials ................5-120
Vehicle Identification .....................................5-121
Vehicle Identification Number (VIN) ................5-121
Service Parts Identification Label ...................5-121
Electrical System ..........................................5-121
Add-On Electrical Equipment .........................5-121
Windshield Wiper Fuses ...............................5-122
Power Windows and Other Power Options ......5-122
Fuses and Circuit Breakers ..........................5-122
Capacities and Specifications ........................5-130

5-2

Service Your dealer knows your vehicle best and wants you to be happy with it. We hope you will go to your dealer for all your service needs. You will get genuine GM parts and GM-trained and supported service people. We hope you will want to keep your GM vehicle all GM. Genuine GM parts have one of these marks:

Doing Your Own Service Work If you want to do some of your own service work, you will want to use the proper service manual. It tells you much more about how to service your vehicle than this manual can. To order the proper service manual, see ServicePublicationsOrderingInformationon page7-11. Your vehicle has an air bag system. Before attempting to do your own service work, see ServicingYourAir Bag-Equipped Vehicle on page1-84. You should keep a record with all parts receipts and list the mileage and the date of any service work you perform. See MaintenanceRecordonpage6-18.

{CAUTION:

You can be injured and your vehicle could be damaged if you try to do service work on a vehicle without knowing enough about it.

• Be sure you have sufficient knowledge,

experience, the proper replacement parts and tools before you attempt any vehicle maintenance task.

CAUTION:

(Continued)

5-3

Gasoline Octane For all except the Silverado SS model, use regular unleaded gasoline with a posted octane of 87 or higher. If the octane is less than 87, you may get a heavy knocking noise when you drive. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. Otherwise, you might damage your engine. A little pinging noise when you accelerate or drive uphill is considered normal. This does not indicate a problem exists or that a higher-octane fuel is necessary. If you are using 87 octane or higher-octane fuel and hear heavy knocking, your engine needs service. If you have the Silverado SS model, use premium unleaded gasoline with a posted octane of 91 or higher for best performance. You may also use middle grade or regular unleaded gasoline rated at 87 octane or higher, but your vehicle’s acceleration may be slightly reduced. If the octane is less than 87, you may get a heavy knocking noise when you drive. If this occurs, use gasoline rated at 87 octane or higher as soon as possible. Otherwise, you might damage your engine.

CAUTION:

(Continued)

• Be sure to use the proper nuts, bolts and

other fasteners. “English” and “metric” fasteners can be easily confused. If you use the wrong fasteners, parts can later break or fall off. You could be hurt.

Adding Equipment to the Outside of Your Vehicle Things you might add to the outside of your vehicle can affect the airflow around it. This may cause wind noise and affect windshield washer performance. Check with your dealer before adding equipment to the outside of your vehicle. Fuel If your vehicle has a diesel engine, see “Diesel Fuel Requirements and Fuel System” in the Diesel Engine Supplement. For vehicles with gasoline engines, please read this.

5-4

Gasoline Specifications It is recommended that gasoline meet specifications which were developed by automobile manufacturers around the world and contained in the World-Wide Fuel Charter which is available from the Alliance of Automobile Manufacturers at www.autoalliance.org. Gasoline meeting these specifications could provide improved driveability and emission control system performance compared to other gasoline.

In Canada, look for the “Auto Makers’ Choice” label on the pump.

California Fuel If your vehicle is certified to meet California Emission Standards (see the underhood emission control label), it is designed to operate on fuels that meet California specifications. If this fuel is not available in states adopting California emissions standards, your vehicle will operate satisfactorily on fuels meeting federal specifications, but emission control system performance may be affected. The malfunction indicator lamp may turn on (see MalfunctionIndicatorLamponpage3-49 ) and your vehicle may fail a smog-check test. If this occurs, return to your authorized GM dealer for diagnosis. If it is determined that the condition is caused by the type of fuel used, repairs may not be covered by your warranty.

Canada Only

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Additives To provide cleaner air, all gasolines in the United States are now required to contain additives that will help prevent engine and fuel system deposits from forming, allowing your emission control system to work properly. You should not have to add anything to your fuel. However, some gasolines contain only the minimum amount of additive required to meet U.S. Environmental Protection Agency regulations. General Motors recommends that you buy gasolines that are advertised to help keep fuel injectors and intake valves clean. If your vehicle experiences problems due to dirty injectors or valves, try a different brand of gasoline. Gasolines containing oxygenates, such as ethers and ethanol, and reformulated gasolines may be available in your area to contribute to clean air. General Motors recommends that you use these gasolines, particularly if they comply with the specifications described earlier.

Notice: Your vehicle was not designed for fuel that contains methanol. Do not use fuel containing methanol. It can corrode metal parts in your fuel system and also damage the plastic and rubber parts. That damage would not be covered under your warranty. Some gasolines that are not reformulated for low emissions may contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT); ask the attendant where you buy gasoline whether the fuel contains MMT. General Motors does not recommend the use of such gasolines. Fuels containing MMT can reduce the life of spark plugs and the performance of the emission control system may be affected. The malfunction indicator lamp may turn on. If this occurs, return to your authorized GM dealer for service.

5-6

Fuels in Foreign Countries If you plan on driving in another country outside the United States or Canada, the proper fuel may be hard to find. Never use leaded gasoline or any other fuel not recommended in the previous text on fuel. Costly repairs caused by use of improper fuel would not be covered by your warranty. To check the fuel availability, ask an auto club, or contact a major oil company that does business in the country where you will be driving.

Filling Your Tank

{CAUTION:

Fuel vapor burns violently and a fuel fire can cause bad injuries. To help avoid injuries to you and others, read and follow all the instructions on the pump island. Turn off your engine when you are refueling. Do not smoke if you are near fuel or refueling your vehicle. Keep sparks, flames and smoking materials away from fuel. Do not leave the fuel pump unattended when refueling your vehicle — this is against the law in some places. Keep children away from the fuel pump; never let children pump fuel.

The fuel cap is located behind a hinged door on the driver’s side of the vehicle.

5-7

While refueling, hang the fuel cap by the tether using the hook located on the inside of the filler door.

To remove the fuel cap, turn it slowly to the left (counterclockwise). It will require more effort to turn the fuel cap on the last turn as you loosen it.

5-8

{CAUTION:

If you spill fuel and then something ignites it, you could be badly burned. Fuel can spray out on you if you open the fuel cap too quickly. This spray can happen if your tank is nearly full, and is more likely in hot weather. Open the fuel cap slowly and wait for any “hiss” noise to stop. Then unscrew the cap all the way.

Be careful not to spill fuel. Don’t top off or overfill your tank and wait a few seconds after you’ve finished pumping before you remove the nozzle. Clean any spilled fuel from painted surfaces as soon as possible. See CleaningtheOutsideofYourVehicleon page5-116. When you put the fuel cap back on, turn it to the right (clockwise) until you hear a clicking sound. It will require more effort to turn the fuel cap on the last turn as you tighten it. Make sure you fully install the cap. The diagnostic system can determine if the fuel cap has been left off or improperly installed. this would allow fuel to evaporate into the atmosphere. See Malfunction Indicator Lamp on page3-49.

{CAUTION:

If a fire starts while you are refueling, do not remove the nozzle. Shut off the flow of fuel by shutting off the pump or by notifying the station attendant. Leave the area immediately.

Notice: If you need a new fuel cap, be sure to get the right type. Your dealer can get one for you. If you get the wrong type, it may not fit properly. This may cause your malfunction indicator lamp to light and may damage your fuel tank and emissions system. See MalfunctionIndicatorLampon page3-49.

Filling a Portable Fuel Container

{CAUTION:

Never fill a portable fuel container while it is in your vehicle. Static electricity discharge from the container can ignite the gasoline vapor. You can be badly burned and your vehicle damaged if this occurs. To help avoid injury to you and others:

• Dispense gasoline only into approved

containers.

• Do not fill a container while it is inside a

vehicle, in a vehicle’s trunk, pickup bed or on any surface other than the ground. • Bring the fill nozzle in contact with the

inside of the fill opening before operating the nozzle. Contact should be maintained until the filling is complete.

• Do not smoke while pumping gasoline.

5-9

Checking Things Under the Hood

Hood Release To open the hood do the following:

{CAUTION:

Things that burn can get on hot engine parts and start a fire. These include liquids like fuel, oil, coolant, brake fluid, windshield washer and other fluids, and plastic or rubber. You or others could be burned. Be careful not to drop or spill things that will burn onto a hot engine.

1. Pull the handle inside

the vehicle located under and to the left of the steering wheel.

5-10

2. Then go to the front of the vehicle and pull up on

the secondary hood release located near the center of the grill.

3. Lift the hood.

Before closing the hood, be sure all filler caps are on properly. Pull down the hood and close it firmly.

5-11

Engine Compartment Overview When you lift up the hood on the VORTEC™ 4300 V6 engine, you’ll see the following:

5-12

A. Engine Air Cleaner/Filter. See EngineAir

Cleaner/Filter on page5-22.

B. Coolant Surge Tank. See EngineCoolanton

page5-32.

C. Air Filter Restriction Indicator (If Equipped). See

Engine Air Cleaner/Filter on page5-22.

D. Engine Oil Dipstick. See EngineOilonpage5-17. E. Automatic Transmission Dipstick (If equipped).

See AutomaticTransmissionFluid(ExceptAllison Transmission®) on page5-24 or Automatic TransmissionFluid(AllisonTransmission®)on page5-27.

F. Fan. See Cooling System on page5-38. G. Engine Oil Fill. See EngineOilonpage5-17.

H. Power Steering Fluid Reservoir. See PowerSteering

Fluid on page5-44.

I. Remote Negative (- ) Terminal (GND). See Jump

Starting on page5-51.

J. Remote Positive (+) Terminal. See JumpStartingon

page5-51.

K. Brake Fluid Reservoir. See Brakesonpage5-47. L. Clutch Fluid Reservoir (If Equipped). See Hydraulic

Clutch on page5-31.

M. Underhood Fuse Block. See FusesandCircuit

Breakers on page5-122.

N. Battery. See Battery on page5-50. O. Windshield Washer Fluid Reservoir. See Windshield

Washer Fluid on page5-45.

5-13

When you lift up the hood on the VORTEC™ 5300 V8 engine (VORTEC™ 4800 and 6000 V8 engines similar), you will see the following:

5-14

A. Engine Air Cleaner/Filter. See EngineAir

Cleaner/Filter on page5-22.

B. Coolant Surge Tank. See EngineCoolanton

page5-32.

C. Air Filter Restriction Indicator (If Equipped). See

Engine Air Cleaner/Filter on page5-22.

D. Engine Oil Dipstick. See EngineOilonpage5-17. E. Automatic Transmission Dipstick (If Equipped).

See AutomaticTransmissionFluid(ExceptAllison Transmission®) on page5-24 or Automatic TransmissionFluid(AllisonTransmission®)on page5-27.

F. Engine Oil Fill. See EngineOilonpage5-17.