This 6.5-inch lift kit for the new Chevrolet Silverado/GMC Sierra 2500/3500 HD with four-wheel drive will clear the large wheel and tire packages you desire.
The comprehensive kit includes a new front crossmember, steering knuckles, brackets, skidplates, stainless-steel brake lines, and all the necessary hardware for a seamless installation. Key to the BDS system is their new front torsion bar mount that links directly to the front lower A-arms, meaning the torsion bars won't need to be dropped for better overall clearance and the front suspension geometry won't be significantly altered. The stiffly sprung rear gets a 5-inch block to achieve a more level stance and BDS 5500-series dampers replace the factory shocks.
BDS advertises the lift will be able to clear tires measuring up to 37 x 12.5 inches on a 20-inch wheel.