2004 GMC Sierra 1500 Pickup Owner's Manual - Page 376

Vehicle* Axle Ratio Maximum Trailer Weight GCWR C-2500 Regular Cab Long Box HD (2WD)* 6000 V8 4.10 10,600 lbs. (4 808 kg) 16,000 lbs. (7 257 kg) 3.73 12,000 lbs. (5 443 kg) 20,000 lbs. (9 072 kg) 8100 V8 4.10 12,000 lbs. (5 443 kg) 22,000 lbs. (9 979 kg) 6.6L V8 Diesel 3.73 12,000 lbs. ( 5 443 kg)** 22,000 lbs. (9 979 kg) C-2500 Extended Cab Short Box HD (2WD)* 6000 V8 4.10 10,300 lbs. (4 676 kg) 16,000 lbs. (7 257 kg) 3.73 12,000 lbs. (5 443 kg) 20,000 lbs. (9 072 kg) 8100 V8 4.10 12,000 lbs. (5 443 kg) 22,000 lbs. (9 979 kg) 6.6L V8 Diesel 3.73 12,000 lbs. (5 443 kg)** 22,000 lbs. (9 979 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 C-2500 Extended Cab Long Box HD (2WD)* 6000 V8 4.10 10,200 lbs. (4 626 kg) 3.73 12,000 lbs. (5 443 kg) 8100 V8 4.10 12,000 lbs. (5 443 kg) 6.6L V8 Diesel 3.73 12,000 lbs. (5 443 kg)** GCWR 16,000 lbs. (7 257 kg) 20,000 lbs. (9 072 kg) 22,000 lbs. (9 979 kg) 22,000 lbs. (9 979 kg) 4-80