I agree that it could be a servo and even considered the valve body, but in my case I heard the "clunk" after I put into reverse. After doing the google thing, I have heard other people have had the same noise under the same conditions and referred to the band as being the problem. I don't really have a place anymore to tear the tranny down so I am looking for a transmission to swap out. Actually found out a friend of mine has a 2002 Explorer he wrecked with a 5r55w tranny. From what I can tell it should work but won't know for sure until I try. As to the problem with the original post in this thread, your correct that the tranny could have a problem other than the band.