Rough Country - 160.20-6-inch Suspension Lift Kit w/Premium N3 Shocks for Chevrolet: 77-87 3/4-Ton Pickup 4WD, 77-91 3/4-Ton Suburban 4WD; GMC: 77-87 3/4-Ton Pickup 4WD, 77-91 3/4-Ton Suburban. FITMENT: Chevrolet: 77-87 3/4-Ton Pickup 4WD, 77-91 3/4-Ton Suburban 4WD; GMC: 77-87 3/4-Ton Pickup 4WD, 77-91 3/4-Ton Suburban 4WD NOTES: Extended brake lines are recommended (Front 71-78: #89340 Front 87-91: #89360 Rear: #89335); If vehicle is equipped with a front sway-bar, drop brackets are recommended (#1019) KIT CONTENTS: Front: Lifted leaf springs, raised steering arm, brake line relocation brackets, u-bolts, and hardware; Rear: 4-inch lift blocks, add-a-leafs, u-bolts, and hardware; Shocks: (4) Premium N3 Shocks SPECS: Installation Time: 6-8 hours; Recommended Tire Size: 37-by-13.50; Weight: 177.28-lbs; Superseded: 160S FITMENT: Chevrolet: 77-87 3/4-Ton Pickup 4WD, 77-91 3/4-Ton Suburban 4WD; GMC: 77-87 3/4-Ton Pickup 4WD, 77-91 3/4-Ton Suburban 4WD