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Differential Advise



The stock E30 M3 differential is 4.10:1 There is usually a silver tag on
the differential which identifies it gearing.There is no noise
difference between the limited slip and non-limited slip. If you have a
limited slip the tag ID shows a "S" before the gearing number. The noise
you are hearing could be: (1) a wheel bearing going bad or (2) a very
high increase gearing ratio ( will sound like a buzz bomb).
More than likely its your wheel bearing.
Henry