'87 4000 Quattro CLUNK!

[Christopher Flanner]

Since my last post, I have spent at least 8 hours under my 4000 trying 
to figure out what is causing the rear end clunk.  I was wrong about 
one thing in my previous post.  Even though the differential mounts 
looked good while inspected in their installed locations, one was 
actually slightly bad.  I took them both off and one had a separated 
rubber to metal interface (1 of 4 on the mount was bad).  I replaced 
both mounts with new ones.  The clunk has not changed at all.

I also had a friend repeatedly cause the clunk while I looked under the 
car.  Everything I saw moved in a controlled and damped manner, 
inconsistent with the clunk sound.

I have not given up.  Every effect has a cause, right?

Chris