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Re: whirring sound from rear (archive)
[ Follow Ups ] [ 7-series (E23) Message Board ] [ Msg. Board FAQ ]
Posted by mike wong on November 18, 2001 at 23:20:18:

In Reply to: whirring sound from rear posted by Jim on November 17, 2001 at 00:20:38:

thought I always left the window open or the door seals were letting road noise in. But it was a bad differential. First try changing the fluid.
As that did not cure the whine, I changed my differential this summer. The factory non LSD ratio for an automatic is 3.25. From a wrecking yard, I found a differential from an 1984 733 with a 3.46 ratio.
Didn't seem to affect the speedometer, but noticed that engine revs about 2-300 rpm higher
at freeway speeds. Now also has a bit quicker acceleration :) think I lost .4 mpg (lead foot?)

check the following post - has one for sale.

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