Most pickup trucks are made with a rake & the rear is normally a little higher than the front, so that they sit level when fully loaded. These leveling kits improve the look of the truck by raising up the front to match the rear (when unloaded). Each kit is a little different for each vehicle application & they work with the stock springs and shocks. Includes all hardware and detailed instruction sheet. Fits: 2011-2018 Chevy Silverado 2500/3500 HD 4WD 2011-2018 GMC Sierra 2500/3500 HD 4WD