Fits: 2001 thru 2010 Chevy Silverado/GMC Sierra 2500HD/3500HD LB7/LLY/LBZ/LMM Duramax Diesel 

Cranking up the factory torsion bar keys overloads the adjusters and limits suspension travel, creating a harsher ride and accelerating front-end wear. Kryptonite uses specially re-indexed torsion-bar adjusting keys that level the vehicle without compromising suspension performance and ride quality. With this kit installed, you can use up to 33" diameter tires. Installation is straight forward and can be accomplished in less than two hours, excluding the required professional alignment. Kryptonite Upper Control Arms are recommend for the best in leveling kit ride quality.