Supreme Suspensions - Silverado 2500HD Lift Kit + Nitro-Charged Performance Shocks Adjustable 1" to 3" Front MAX Torsion Keys + 3" Solid Aircraft Billet Rear Lift Blocks + Shims FITMENT: 2001 - 2010 Chevy Silverado 2500HD (2WD 4WD). CONTENTS: 2x Cold-Forged MAX Torsion Carbon Steel Lift Keys, 2x Solid Aircraft Billet Lift Blocks, 4x Extended Zinc Plated U Bolts, 4x Nitro-Charged Performance Shocks, 2x Axle Pinion Alignment Shims, Installation Hardware, Installation Instructions, and Pro Pack. TECHNICAL NOTES: Adjustable 1 to 3 Inch Front Leveling Lift and 3 Inch Rear Lift. INSTALLATION: Easy 'bolt-on' installation takes 3 to 4 hours. A torsion bar puller is required. BENEFITS: Improves the look of your truck and increases ground clearance, allowing you to fit larger custom rims and tires. Nitrogen-charged shocks provide an enhanced ride quality and off-road capability.