umm.. as far as what all you need to replace, then you need to talk to Hammer, apenn, and the guy that's got a Turbo GT..
Here's the link to Baumann Engineering, I have never dealt with them, but their products seem to hold up to stress.. I know there are a coupld forced induction guys here with automatics, they would be better to ask about the specifics.. I just would hate to see you throw out a perfectly good tranny when you could just have it rebuilt, unless you can't afford the down time.
BE - 4R70W/AODE Site