The TeraFlex TJ: Large Control Arm Joint Rebuild Kit includes all the necessary components to rebuild the large joint of a TeraFlex Front/Rear Lower Short Control Arm, Front/Rear Lower LCG Long Control Arm, or Rear Upper Pro LCG Long Control Arm. Environmental factors such as dust, fluids, and road grime take their toll on bushings. For optimal performance, we advise periodically rebuilding your joint to restore it to factory tolerances.