Liftcraft - Differential Drop Kit for 2007 - 2018 Chevrolet Silverado 1500 and GMC Sierra 1500 6-Lug 4WD FITMENT: 2007-2018 Chevrolet Silverado 1500 6-Lug 4WD and 2007-2018 GMC Sierra 1500 6-Lug 4WD | NOTE: Will not fit 2007 Classic models MATERIAL: CNC machined from solid aluminum blocks INSTALLATION: Bolt-on kit, only takes a couple of hours to install; No modifications required CONTENTS: Differential Drop Kit (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