Supreme Suspensions - GMC Sierra Leveling Kit Adjustable 1" - 3" Front + 1.5" Rear Suspension Lift Keys Blocks with U-Bolts and Pro Performance Series Shocks 4WD 4x4 (Black) PRO FITMENT: 1999 - 2007 GMC Sierra 1500 (4WD). Will only fit Classic models. CONTENTS: 2x Carbon Steel Adjustable Torsion Keys, 2x Billet Aluminum Rear Lift Blocks, 4x Plated Steel U-Bolts, 4x Pro Performance Series Shocks, Installation Hardware, Installation Instructions and Supreme Pro Pack TECHNICAL NOTES: 1 - 3 inch front suspension lift and 1.5 inch rear suspension lift. Fits 6-Lug models only. INSTALLATION: Easy bolt-on installation takes 3 to 5 hours. An alignment is always recommended if you are altering the height of your vehicle. A torsion bar puller is required. BENEFITS: Improves the look of your truck and increases ground clearance, so you can fit larger tires. Upgraded suspension performance. TWICE as strong as factory keys and lift indexed. Solid light weight blocks CNC machined from Aircraft Billet. (2x) Carbon Steel Adjustable Torsion Keys (2x) Billet Aluminum Rear Lift Blocks (4x) Plated Steel U-Bolts (4x) Pro Performance Series Shocks Installation Hardware Installation Instructions Supreme Suspensions Pro Pack