Rough Country - RC0500-1.5-inch Lowering Shackles (Pair) for Chevrolet: 99-18 Silverado 1500 4WD/2WD; GMC: 99-18 Sierra 1500 4WD/2WD FEATURES: Easy bolt-on installation.; Maintains factory ride quality.; Works with both 4wd and 2wd models.; Lowers the rear to be level with the front of the vehicle. 1999-2018 4WD/2WD Chevrolet Silverado 1500 Pickup; 1999-2018 4WD/2WD GMC Sierra 1500 Pickup KIT CONTENTS: Lowering shackles; Hardware Est. Install Time: 1-2 hours; SKU: RC0500 FITMENT: 1999-2018 4WD/2WD Chevrolet Silverado 1500 Pickup; 1999-2018 4WD/2WD GMC Sierra 1500 Pickup