a wrangler one could also be made to work, but not directly. you'll still need XJ/MJ t-case linkages and an XJ/MJ AX-4/5 shifter handle. plus the wrangler trannys seem to all rotate the t-case up slightly. this can be a good thing cause it provides a bit better ground clearance, or a problem if the t-case hits the floor (which can be solved with a big hammer).
car-part.com can help in junkyard searches.