4 speed

I assume that you are talking manual shift 4-speed.
Start checking local wrecking yards, I have even seen Ramcharges with 4-speeds. The trans is the same no matter what engine.
Grab the transfer case when you find one, if I remember correctly the cast iron piece between the transfer case and transission are different lenghts between an auto and 4-speed.

The major problem I see is finding the factory aluminum bell-housing, they pop up for sale every once in a while but they are very expensive to buy.