Supreme Suspensions - Sierra Silverado 1500 6-Lug 3" Front + 3" Rear Lift Kit w/Shock Extenders & Block Shims CONTENTS: 2x Cold-Forged MAX-Torsion Carbon Steel Keys, 2x Carbon Steel Shock Extenders, 2x Solid Aircraft Billet Lift Blocks, 4x Extended Zinc Plated U-Bolts, 2x Axle Pinion Alignment Shims, Installation Hardware, Instructions and Pro Pack. FITMENTS: Chevy Silverado 1500 1999-2007 4WD; GMC Sierra 1500 1999-2007 4WD TECHNICAL NOTES: Adjustable 1 - 3 inch front suspension lift and 3 inch rear lift. For 4WD models with 6-lug axle congurations. 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 lift indexed. Solid sheer strength and light weight premium Aircraft Billet material. INSTALLATION: Easy 'bolt-on' installation takes 2 - 4 hours. A torsion bar puller is required.