Reduce differential bushing deflection and minimize wheelhop with polyurethane differential bushings from BMR Suspension. Polyurethane is a synthetic polymer that has many properties that make it far superior to OEM rubber bushings. Polyurethane deflects far less that soft rubber, and it doesn’t breakdown from exposure to petroleum products, road salt, ozone, and other elements of the harsh undercar environment suspension bushings live in. BMR’s polyurethane differential bushings (BK001) drastically increase differential stability over the factory rubber bushings. The bushings are molded from 68-durometer polyurethane, which reduced bushing deflection, while still absorbed road noise and engine vibrations. This allows you to increase performance without decreasing comfort.