2006 GMC Sierra 1500 Pickup Owner's Manual - Page 387

Vehicle* Axle Ratio Maximum Trailer Weight GCWR K-1500 Extended Cab Long Box (4WD)* 3.42 6,500 lbs (2 948 kg) 12,000 lbs (5 443 kg) 4800 V8 3.73 6,500 lbs (2 948 kg) 12,000 lbs (5 443 kg) 4.10 7,500 lbs (3 402 kg) 13,000 lbs (5 897 kg) 3.42 4,500 lbs (2 041 kg) 10,000 lbs (4 536 kg) 4800 V8 (Manual) 3.73 4,500 lbs (2 041 kg) 10,000 lbs (4 536 kg) 4.10 5,500 lbs (2 495 kg) 11,000 lbs (4 990 kg) 3.42 7,500 lbs (3 402 kg)** 13,000 lbs (5 897 kg) 5300 V8 3.73 7,500 lbs (3 402 kg)** 13,000 lbs (5 897 kg) 4.10 8,500 lbs (3 856 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. Vehicle* Axle Ratio Maximum Trailer Weight C-2500 Regular Cab Long Box HD (2WD)* 6000 V8 4.10 10,500 lbs (4 763 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 20,000 lbs 22,000 lbs 22,000 lbs (7 257 kg) (9 072 kg) (9 979 kg) (9 979 kg) 4-75