The OE ball joints use a nylon insert that fails prematurely, causing shimmying and poor handling. And because the OE ball joints are an integral piece of the OE control arm, you cannot simply replace the ball joint, you have to replace the entire control arm assembly. Our reinforced aluminum control arm upgrade is not only lighter and stronger than stock, it has replaceable ball joints. Plus, our ball joints use an all-metal insert that performs better and last longer than the OE part. This Kit includes the upgraded control arms for both sides as well as a pair of our heavy duty front control arm bushings.