2005 GMC Sierra 1500 Pickup Owner's Manual - Page 376

Vehicle* Axle Ratio Maximum Trailer Weight GCWR K-3500 Extended Cab (4WD)* 6000 V8 Dual 4.10 9,400 lbs (4 264 kg) 16,000 lbs (7 257 kg) Rear Wheel 6000 V8 Single 4.10 9,600 lbs (4 354 kg) 16,000 lbs (7 257 kg) Rear Wheel 8100 V8 Dual 4.10 12,000 lbs (5 443 kg) 22,000 lbs (9 979 kg) Rear Wheel 8100 V8 Single 4.10 12,000 lbs (5 443 kg) 22,000 lbs (9 979 kg) Rear Wheel 6.6L V8 Diesel Dual 3.73 12,000 lbs (5 443 kg) 23,500 lbs (10 659 kg) Rear Wheel (Manual) 6.6L V8 Diesel Dual 3.73 12,000 lbs (5 443 kg) 23,500 lbs (10 659 kg) Rear Wheel (Auto) 6.6L V8 Diesel Single 3.73 12,000 lbs (5 443 kg) 22,000 lbs (9 979 kg) 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. Vehicle* Axle Ratio K-3500 Crew Cab (4WD)* 6000 V8 Dual 4.10 Rear Wheel 6000 V8 Single 4.10 Rear Wheel 8100 V8 Dual 4.10 Rear Wheel 4-82 Maximum Trailer Weight 9,100 lbs (4 128 kg) 9,400 lbs (4 264 kg) 12,000 lbs (5 443 kg) GCWR 16,000 lbs (7 264 kg) 16,000 lbs (7 264 kg) 22,000 lbs (9 979 kg)