The control arms are stronger than the stock arms and are 100% bolt-on. The control arm are a direct fit and will work on trucks with stock height, or with lift kit for up to 6" lift. Adjustable control arms allow you to easily re-center your axle, adjust your pinion and caster angles, and allow your axle to move freely on and off the road free of unnecessary binding. New control arms with solid bushings can also help with problems like death wobble.