Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › installing balljoint boot new ball joint › installing balljoint boot new ball joint August 19, 2014 at 12:03 am #622980 AustinParticipant ball joint goes in. I believe the snap ring goes under the control arm on the bottom of the BJ. in the groove, and then slip the bottom over, and put the wrap ring around the boot. The boot should not go through the control arm.