Production vehicles are built using rubber bushings in control arms, strut arms, leaf springs, body mounts, motor mounts, transmissionmounts, sway bars and shocks. Additionally, rubber components can be found being used on coil spring pads, leaf spring pads and suspensionbump stops. Not only are rubber components on the soft side, to accommodate the typical car and truck buyer, they tend to deteriorate rapidly.This contributes to premature component failure, a ?spongy? ride and less than ideal performance handling.PROTHANE? urethane can correct these conditions, while improving driveability.