Control arm bushings usually consist of an outer metal sleeve, a durable rubber or polyurethane bushing, and an inner metal sleeve. Control arm bushings are important for driving comfort and handling. They cushion the suspension system which in turn controls noise and vibrations, and also provide a softer ride over bumps. Bushings can flex and move while retaining stiffness and the ability to return to their original shape and position. If you're adding a lift kit to your vehicle, remember that the upper control arm influences wheel travel, suspension durability, and wheel alignment. If you're looking for a suspension modification that improves overall vehicle performance with no compromises, a replacement control arm is a good place to start.