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Just random thoughts, and maybe you've already considered....
- I would think that if you had a problem in the driven powertrain (aft part of the tranny back to and including the diff), that you would detect a difference in the sound when going from powered to coasting conditions.
- Have you tried swerving the car side to side while underway to see if it the noise gets better or worse, depending on the direction you're turning?
- Have you checked the tires (very closely, BTW) for out-of-round condition? Many times a "slipped belt" on a radial tire will cause that tire to generate excessive noise.
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1971 142E ITB racer, 1973 1800ES, 2002 S60 T5
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