I posted this question a few months back on the Yahoo board and didn't get much info, so I thought I would try again.

I occasionally get a loud clunk/clank/pop when I am backing up. Also, it has been happening sometimes when I have to stop on the brakes in a hurry. It is not the ABS. It has a distinct sound and doesn't happen all of the time. I have had it into the dealership 3 times and no one can figure it out. Mainly because it is tough to recreate.

They have tightened my U-bolts, but that is about it. It sounds like it is coming from the rear, but it could be anywhere. The best description of the noise is to imagine a hollow piece of metal having a dent popped out of it. It is a very deadening clunk.

Any thoughts? Ideas?

Thanks.