Kryptonite KR6693 Lower Ball Joint (Stock Control Arm)The Kryptonite Lower Ball Joint (Stock Control Arms) KR6693 will replace the broken unit in your GM Silverado Sierra 2500HD 3500HD. Because this ball joint is designed for heavy duty use, it can withstand even the roughest terrain and still function effectively. A robust Black Oxide coating has been applied to this ball joint to prevent corrosion and maintain functioning. Kryptonite ball joints, pre greased with premium grease, are ready for