Key Features of The Skyjacker 6 " lift kit for the Chevy Silverado and GMC Sierra include the fact that no cutting of the upper front differential housing mount or drive shaft modification is required. The kit includes CNC machined steering knuckles, drop bracketry for the front upper differential mounts, heavy-duty crossmembers, bracketry to drop the torsion bar cross member. Rear leaf springs with bushings & u-bolts included. The installation is reversible, a feature few other lifts have. Shocks are sold separately.