TC Kline Mono-ball Rear Trailing Arm Bushing Set - For the ultimate in response grip & stability. This bushing set is designed to eliminate the unwanted bump steer which is inherent in the stock rubber bushings. By substituting the stock bushing with a spherical ball joint, (replaceable), mounted in an aluminum housing, these bushing replacements prevent toe changes caused by bushing flex during cornering and can also help prevent tearing of the trailing arm mounts.