1999-2006 GM 1500 4.5" Lift Kit with NX2 Nitro Shocks (BDS181H)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. Features Front Lift Method: Cross Member Rear Lift Method: Block Shocks Included: