I would say check the bushings.. thrust arm bushings or whatever you may have that you said are original.. I had the same thing on my E34 (between 42-52 mph).. I dont know how similar problems can be between E34 and E39, but give it a shot! Mine works just fine now..
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<span style='color:Green'>...no matter how slow your BMW is, at the end of the day, you still drive a BMW</span> :redspotda
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