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We had something like this issue on my daughter's 940 (same front suspension). Reportedly the caster angle on the right side was off a fair bit and the only correction was a longer lower control arm. (Replacing the bushings made no difference). The alignment shop was quite thorough and after a test drive the head guy said the car still "leads" to the right a little. Apparently Volvo do/did stock two or three lengths of control arms for caster adjustment...or maybe that's urban legend?
As the tendency to wander right with hands off the wheel was very slight and the expense to correct it considerable, it has been lived with for many years now with no apparent tire wear abnormality.
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Son's XC70, daughter's 940, my 81 and 83 240's, 89 745 (V8) and S90. Also '77 MGB and some old motorcycles
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