Ball joint on the lower control arm.

Should be obvious which side if you listen outside the car.

Change PRONTO, they can fail with the result the control arm hits the ground and the wheel kicks out sideways. Not fun.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!