Supreme Suspensions - Chevy GM HD Lift Kits HD Series 1.5" Rear Suspension Lift Blocks CNC Machined Aircraft Billet (Black) PRO FITMENT: 2000 - 2008 Sierra 2500HD and Silverado 2500HD CONTENTS: 2x Aircraft Billet Lift Blocks, 4x Extended Zinc Plated U-Bolts, Installation Hardware, Instructions and Pro Pack. TECHNICAL NOTES: 1.5 inch rear suspension lift. Maintains factory ride quality. Alignment after lift is recommended. BENEFITS: Improves the look of your truck and increases ground clearance, allowing you to fit larger custom rims and tires. Factory shocks can be reused. Solid sheer strength and light weight lift material CNC machined from Aircraft Billet. INSTALLATION: Easy 'bolt-on' installation takes 1 - 2 hours. No special tools required.