Transmission or possible u-joint

What is your question?

Put escalade in to reverse. As i was rolling backwards a loud noise started and sounded like rocks bamging against something. I instantly stopped and put in park shut ut off and a few mintutes later started it and everything seems fine. Then noticed a little bit of tramsfluid is leaking but is not low. What could this be?

What makes this problem better or worse?

It stopped when I turned the engine off and on

How long has your 2007 Cadillac Escalade had this problem?

Just once