BMR BK046 Differential Bushing Kit minimizes power robbing differential movement by replacing the OE soft rubber bushings with four high durometer front polyurethane bushings and 2 rear Delrin bushings. The combination of 95 durometer polyurethane bushings and Delrin effectively eliminates wheelhop with minimal contribution to road noise or driveline vibrations. BMR differential bushings should be considered an absolute must for any type of high horsepower application.