Check the coupler, it's common for it to loose it's bushings, makes the car wander and the steering wheel will rattle on rough pavement -- clack-clack noise. Watch the coupler while someone move the wheel, if the rear half of the coupler moves independent of the front half, replace it.

Should tighten the steering up quite a bit.

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!