Run your rear coils at the right angle; these shims correct the rear coil angle of a lifted TJ by 10 degrees, thus putting them at the optimum angle for on and off-road applications. A bowed coil spring can rub against the track-bar bracket or other components. Utilizing a correction shim keeps the coil straight, thus prolonging the life of the coil itself as well as giving a more pleasurable driving experience.
