Rear clunk refined

["J. Smethers" <smethers@fast.net>]

Audi'tes,

I had posted earlier today regarding a rear clunk on my 4KCSQ.  I drove
around tonight with a friend in the back seat.  It's definitely coming from
the rear.  I am get the same sound by accelerating hard and then quickly
backing off the throttle.  Something is shifting back there and my friend
confirmed he could feel vibration on the left side.  That is the side the
sound is coming from.  
When I bought the car, I had a two control arm installed and a 4-wheel
alignment.  Is it possible something was not connected correctly.  I don't
want to pay for another alignment if I don't have to.
Thanks for the help.

Regards, Jeffrey Smethers
smethers@fast.net
'84 318i
'86 4000CS Quattro