On the W124 cars, the rear links & mounting bushings will allow the REAR to change.

If that happens you will constantly have to move the steering wheel to keep the car going straight.

MOST likely in the rear. Try watching the rear wheels & move the trans position from drive to reverse. IF you see a change in the positioning of the wheel in the opening then either 1 of the links OR a bushing is the problem.

You might try power braking in both D & R a few times to load the drive line.

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