AFCO Rebuildable Lower Ball Joint, Steel Cap, 71-76 Impala - 21038Improves weight transfer. Frees up suspension for more consistent, repeatable chassis tuning. Precision machined to tight tolerances, providing consistent resistance throughout the travel of the ball joint, to deliver consistent performance. Road inputs are controlled more effectively by the shock and spring instead of the tire, which improves traction. Removes suspension bind and allows shock & spring to have more precise wheel control. Position: