Liftcraft - Adjustable 1-3" Front + 2" Rear Lift Kit for 99-07 GMC Sierra 1500 & Chevy Silverado 1500 4x4 6-Lug | Torsion Keys + Lift Blocks + Axle Shims + Unloading Tool (Steel + T6 Billet) LIFT: 1-3 inch adjustable front and 2 inch rear suspension lift over stock FITMENT: 1999 - 2007(classic) Chevrolet Silverado 1500 and 1999 - 2007(classic) GMC Sierra 1500 4WD models | NOTE: *6-lug models only / **Please contact us prior to payment if your truck has rear overload leaf springs. MATERIAL: High Strength Steel Torsion Bar Lift Keys, two times the strength of your factory keys | 6061-T6 Billet Aluminum Lift Blocks with ideal strength and weight INSTALLATION: Bolt-on kit, only takes a few hours to install; No modifications required CONTENTS: Carbon Steel Torsion Keys (2), Aluminum Lift Blocks (2), Extended U-Bolts (4), Aluminum Axle Shims (2), Carbon Steel Unloading Tool (1), Hardware and Detailed Instructions - Liftcraft suspension lift and leveling kits come with a lifetime guarantee and are the easiest, safest, and most affordable way to improve the look of your truck and run bigger tires