Careful dude. I just got my truck with 160k on it and I took it to a shop to change all the fluids and after they changed the tranny it would not shift out of first and rather then paying a bunch to bandaid it together, I oppted for a rebuild with much stronger parts.
I thought I was doing a good thing by changing the fluids and turns out that it bit me on the butt!
this is typical of high miles and no tranny service in the past (or so I am told by many )
http://www.powerstroke.org/forum/7-3...id-change.html