Supreme Suspensions -GMC Sierra 1500 Lift Leveling Kit Adjustable 1" - 3" Front Carbon Steel Torsion Keys + 1.5" Rear Billet Blocks with U-Bolts 4WD 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, 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 2 to 4 hours. An alignment is always recommended if you are altering the height of your vehicle. A torsion bar puller is required. Extended U-Bolts may be required for overload models. 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 Installation Hardware Installation Instructions Supreme Suspensions Pro Pack