Supreme Suspensions - 2011-2018 Silverado Sierra 2500HD 3500HD Lift Leveling Kit Adjustable 1 To 3 Inch Front + 1 Inch Rear With Shock Extender Brackets 4WD 4x4 Pro FITMENT: 2011 - 2018 Chevy Silverado 2500HD, 2011 - 2018 Chevy Silverado 3500HD, 2011 - 2018 GMC Sierra 2500HD and 2011 - 2018 GMC Sierra 2500HD (4WD). For models with 8-lug axle configurations. CONTENTS: 2x Cold-Forged Carbon Steel MAX-Torsion Keys, 2x Billet Aluminum Rear Lift Blocks, 4x Extended Plated Steel U-Bolts, 2x Carbon Steel Shock Extenders, Installation Hardware, installation Instructions and Pro Pack. TECHNICAL NOTES: 1 - 3 inch front and 1 inch rear suspension lift. Maintains factory ride quality. INSTALLATION: Easy installation takes 2 - 4 hours. A torsion bar puller is required. An alignment is recommended after install. BENEFITS: Improves the look of your truck and increases ground clearance, allowing you to fit larger custom rims and tires. Factory shocks can be reused. (2x) Carbon Steel Adjustable Torsion Keys (2x) Billet Aluminum Rear Lift Blocks (4x) Extended Plated Steel U-Bolts (2x) Carbon Steel Shock Extenders Installation Hardware Installation Instructions Supreme Suspensions Pro Pack