I've been looking for either mountaineer's or explorers that are 96-2001. Supposedly these are the easiest to swap in. Few electrical mods, and a trans. spacer to keep the stock transfer case.
Sadly, no good doners so far... I'm gonna keep looking, but wanted to explore the option of beefing up the 4.0 still. The 4.0 would be a little different at very least.. but the name of the game is HP and torque.. which the 5.0 would give me.. just gotta keep my fingers crossed for a solid doner..