The complete automotive resource for buyers, sellers, and owners like you.
Car, Truck and SUV Forums at Roadfly
+ Bentley Forums
+ BMW Forums
+ Cadillac Forums
+ Chevrolet Forums
+ Ferrari Forums
+ Jaguar Forums
+ Lamborghini Forums
+ Lotus Forums
+ Mercedes-Benz Forums
+ Maserati Forums
+ MINI Forums
+ Porsche Forums
+ General Discussion
+ Marketplace Forums
Re: whirring sound from rear (archive)
[ Follow Ups ] [ 7-series Message Board ] [ Msg. Board FAQ ]
Posted by mike wong on November 18, 2001 at 23:17:28:

In Reply to: whirring sound from rear posted by Jim on November 17, 2001 at 00:10:59:

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?)

Follow Ups:


[ Follow Ups ] [ 7-series Message Board ] [ Msg. Board FAQ ]
Questions, comments, or problems, please visit the Roadfly help desk.
Roadfly.com Logo © 1997 - 2008 Jump Internet Inc. All rights reserved.