Do you guys over there have Tremec transmissions, (sorry if thats a stupid question) and if so can an NP235 or 205 transfer be bolted to the back of the TKO-600 (5 speed) or the T-56 Magnum. (6 speed)

 

Looks like you might need a divorced Tcase to use one of those:

nothing 4x4 here:

Tranzilla - Rockland Standard Gear, Inc.

maybe they will build you one:

TTC: TREMEC Transmissions

http://www.ttcautomotive.com/English...sp?mode=Region

 

Well, GM put a T5 in the S10s, and I think AMC used them in the early 80s, but they are a pretty weak transmission for a four wheel drive truck. The GM would have the wrong spline count to find a left hand drop transfer case for as well.
I would look for a M5R2, and rebuild it. That was the HD trans option in the Thunderbird over the T5.

 

That Tranzilla sounds like one hell of a box.....