Rear Differential Polyurethane Bushing Kit for SC300/SC400/SoarerDoes your rear end clunk while shifting gears? Chances are your original rubber bushings are worn out and need to be replaced. These Strongflex polyurethane bushings will restore the ride quality and performance of your rear differential. Strongflex products are made of polyurethane better than traditional rubber parts. Polyurethane has the added benefits of increased safety, better durability and sustainability of the steering and suspension systems.