By the way, their automatic prior to the 1980s was a GM TH400. The trans was rotated slightly and redrilled to fit the AMC block. I put one in my '69 Javelin with a B&M shift kit and it was an entirely different car. Sometime in the '80s they switched to the Chrysler 737 Torqueflite. Another rock-solid automatic.
Advance Adapters in Pasa Robles CA may still be around. They used to make adapters for all kinds of engine/trans swaps for Jeeps. They may have a kit to put your preferred tranny behind a Jeep six. I used their stuff to put a Saginaw 4 speed from a Camaro behind the Buick V6 in my Jeep.
