Supreme Suspensions - Adjustable 1 - 3" Front Suspension Lift + Shock Extenders Silverado 4WD Leveling Kit (Black) PRO CONTENTS: 2x Cold-Forged Carbon Steel MAX-Torsion Keys and Shock Extenders, Hardware, Instructions and Pro Pack. TECHNICAL NOTES: 1 - 3 inch front suspension lift. For Silverdo Classic 4WD models with 6-lug axle configurations. INSTALLATION: Easy bolt-on installation takes 1 - 2 hours. A torsion bar puller is required. BENEFITS: Improves the look of your truck and increases ground clearance, so that you can fit larger tires. Designed so that you can reuse your factory shocks. TWICE as strong as factory keys and indexed for lift.