Unless something is loose or you hit a curb, look at the following:

upper strut mount. any cracks in the rubber, they need to be replaced and you will then need another alignment.

Rear links -- look for out of center bushings or signs of torn rubber. Another test is to jack the rear wheel free of the ground and set the parking brake, they apply torque to a lug bol. If the wheel moves back and forth with torque on the lug bolt, the links need replacing.

Rotate tires, if the pull follows a tire, replace it, the belt is loose.

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!