SuperPro SPF5756K Rear Upper & Lower Trailing Arm Bushing SetSuperPro SPF5756K Rear Upper & Lower Trailing Arm Bushing Set Time, mileage, weight, power, torque, towing and hauling all enemies of rubber bushings in hard working full size trucks. The more that is asked of soft rubber OEM bushings the more quickly they degrade and potentially fail. The 'DS' series RAM 1500 has been an owner favorite since its introduction in 2010, so much so that it soldiered on for many years along side the 'DT' series intended