UCL rear trailing arms help keep your rear wheel centered in the wheel well. Without them, your rim and tire would be pushed forward in the fender. This can cause the tire to rub and also looks funny, as its not sitting centered in the wheel well. Our arms are built from massive wall tubing and are rated for over 1,000 hp. To properly set your drive shaft angle, all trailing arms are fully adjustable via threaded ends. All parts are finished in a durable black powder coat finish and come with a lifetime warranty against manufacturer defects.