When working on Cadillac Seville and Eldorado, always replace the lower ball joint if you find the seal damaged or loose. Plug in your car on jack stands and let the suspension fall free so we can examine it. Check the tire top and bottom to see if moving the top up and down makes the knuckle move higher or lower on its lower
Control Arm. If the knuckle moves, replace the joint. Give the ball stud wheel a shake, then examine if it moves at each end, especially where the stud meets the stud end or castellated nut. Doing this helps prevent stud bending or hole getting bigger. When you find the ball joint unstuck and loose, or see it shifting in and out of its socket, you must change the entire ball joint and socket assembly. To service the front suspension ball joint, place the vehicle on jack stands, take off the wheel, and if your engine is a 4.6L model, disconnect the road sensing suspension position sensor from the control arm. After removing the cotter pin and nut from the ball joint stud, we need to use a ball joint separator tool to unscrew it from the
Steering Knuckle. The recommended drill bit is 13 mm. Put the new ball joint on the lower control arm. Bolt it in place with three mounting bolts and nuts, but place the bolts from the control arm end, and tighten the nuts to OEM specifications. Put the ball joint onto the steering knuckle and fix its castelated nut, tightening it to official specifications. After putting in a fresh cotter pin, tune the nuts to get the pin hole aligned before insertion. Reconnect the suspension sensor if it monitors road conditions, take away the CV-joint boot protetor tool, put the tire and wheel back on, then bring the vehicle back to ground level.