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Raise and support vehicle under lower control arms. Clamp self-locking pliers on hub at axle drive nut, so that pliers are in a horizontal position. Using a suitable stand, mount dial indicator so that contact tip of indicator points downward and rests against pliers. Place pry bar between lower control arm and drive axle outer race, and pull down on bar. If dial indicator reading exceeds 0.125", replace ball joint.