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Re: Center Diff Noise on 4ksq

From: "Roos, Hans" <Hans.Roos@caere.com>
Date: Tue, 28 Jan 1997 08:18:23 -0800
Subject: Center Diff Noise on 4ksq

>Hi All,
>I was playing around with the differential locks the other day and while
>stopped at a light, car in neutral with the center diff locked, there
>was a deep hum and a vibration that is not present when the center
>differential isn't locked.  Is this normal?  Also, it seemed to take
>quite a while for the diff to unlock, while under way, this was on a
>straight piece of road.  Anything to be concerned about?

My 1984 80 quattro does this.

If you leave the centre diff locked, the next time you start it up the car 
sounds very noisy.  Its as if the engine mountings have changed to metal 
instead of rubber.

My centre diff likes to unlock when changing up a gear i.e. 2nd to 3rd.

A few years ago it would only unlock if I drove in reverse for a short 
distance.  I couldn't see anything wrong with the cable, but when I changed 
the rear diff mounting rubber bushes, the problem went away.

1984 Audi 80 quattro
1989 Audi 100 Avant
 - -Hans