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Do you get any clunking from the rear going over bumps? The rear trailing arms holds the wheel in position relative to the rest of the suspension, and if that ball joint is really worn out it could allow some movement of the wheel fore and aft, which changes the camber and toe. This toe change would cause the rear end to wander around like you describe.
Also if the rubber bushings on the chassis side of the lower control arm or toe arm are worn out, this could allow some movement.
Also a failed rear wheel bearing would allow the rear to wander.
Lastly, even just a bad alignment with toe out in the rear would give a wandering back end.
Any noises at all when driving, or any recent work done?
Steve
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