4.5 Inch Lift Kit Silverado/Sierra 1500 99-06 4WD 5 Inch Block BDS SuspensionEngineered 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