Rough Country - 25820 - 4-inch Non-Torsion Drop Suspension Lift Kit w/ Premium N3 Shocks for Chevrolet: 99-06 Silverado 1500 4WD; GMC: 99-06 Sierra 1500 4WD FITMENT: Chevrolet: 99-06 Silverado 1500 4WD; GMC: 99-06 Sierra 1500 4WD KIT CONTENTS: Front: Lifted knuckles, differential drop brackets, front and rear drop crossmembers, skid plate, sway bar links, CV spacers, and non torsion bar drop brackets; Rear: 5-inch lift blocks and u-bolts; Shocks: (4) Premium N3 Shocks BENEFITS: Maintains factory ride quality; Will work with Auto Trac; Unmatched ground clearance; Torsion bars stay in factory location; Newly Redesigned; Easier Installation; Axles maintain factory position and angle; No drivetrain or exhaust modifications required; Designed to reuse factory compression travel stop TECHNICAL NOTES: Does not fit HD models; Frame bracket modification required; If equipped with factory 17-inch wheels, 17-inch or larger aftermarket wheels must be used; Torsion bar unloading tool required for installation ITEM SPECIFICS: Installation Time: 8-10 hours; Backspacing: 4.5-inches; Recommended Tire Size: 33-by-12.50; Weight: 200.89-lbs; Superseded: 258N2, 258S