Supreme Suspensions - Silverado Sierra Leveling Kit Adjustable 1 to 3 Inch Front Suspension Lift + Shock Extenders Chevy Heavy Duty 2500HD 3500HD 4WD 4x4 (Easy Install) 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 Carbon Steel Shock Extenders, Installation Hardware, installation Instructions and Pro Pack. TECHNICAL NOTES: 1 - 3 inch front suspension lift. Maintains factory ride quality. INSTALLATION: Easy installation takes 1 - 2 hours. A torsion bar puller is required. An alignment is recommended after install. BENEFITS: Improves the look of your truck and increases ground clearance, so you can fit larger tires. Factory shocks can be reused. TWICE as strong as factory keys and indexed for lift. Adjustable lift height lifts according to your preference. (2x) Carbon Steel Adjustable Torsion Keys (2x) Carbon Steel Shock Extenders Installation Hardware Installation Instructions Supreme Suspensions Pro Pack