Has it always done this? If this sound is new, I would suspect a problem.
BTW, I had a problem with the Universal at the rear Diff. It wasn't lubricated correctly during the build, and there was a clunk now when going from forward to reverse or back (I have a manual - but the problem is the same irrespective of transmission).
There's a TSB and revised 'parts pack' on this. Considering you have the same year and model, it might be the same thing.
Last edited by AlanAZ; 01-24-2010 at 08:07 PM.
Reason: mo info