Engineered to improve stance, performance, and capability, the BDS 4.5-inch lift kit for the 1999-2006 Chevy Silverado and GMC Sierra 1500 4WD is a must have upgrade. For maximum ground clearance, BDS designed a No Torsion Bar Drop System where the torsion bars are mounted directly to the top of the lower a-arm eliminating the need to drop the torsion bar cross-member. This kit includes everything necessary to set your truck up right with clearance for up to 33" tires.