Rough Country - 257.20-4.75-inch Suspension & Body Lift Combo Kit w/Premium N2.0 Shocks for Chevrolet: 07-13 Silverado 1500 4WD; GMC: 07-13 Sierra 1500 4WD Features: Easy bolt-on installation; Maintains factory ride quality; Increased ground clearance; Able to be returned to stock; Levels the front with the rear of the vehicle; No need to disassemble your struts to install; Differential drops maintain proper axle angle.; Control arms include POM ball joints for greater range of motion and easier installation.; Fabricated blocks are stronger and offer a longer lifespan than cast blocks.; Includes application valved N3 series shocks Fits: 2007-2013 4WD Chevrolet Silverado 1500; 2007-2013 4WD GMC Sierra 1500 Notes: Requires minor cutting and drilling.; Does NOT fit 2007 "Classic" models.; Does NOT fit models with electric steering.; New fabricated blocks replace your factory block.; Retain your factory wheels with our 0.25" wheel spacers (#1065). Kit Contents: FRONT: Upper strut spacers, Upper control arms, Upper ball joints, Differential drops, Differential skid plate, Hardware; REAR: 3in fabricated lift blocks, U-bolts, Hardware; SHOCKS: (2) Rear Premium N3 series; BODY: Body spacers, Front bumper brackets, Ground strap bracket, Grade 8 hardware Specs: SKU: 257.20; Est. Install Time: 6 - 8 hours