Level your truck by lowering the rear! From the factory, your GM 1500 sits lower in the front than the rear. Leveling the truck from front to rear can drastically improve the look of your vehicle. This simple lowering shackle makes it easy to reduce the amount of rear height, giving you a level look from front to back for an improved appearance.?;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.