I so understand the lack of tub Jeeps...And if one does show up it is either an old mail/postal AM General or a left over mass of Car-B-que! Kinda hard to salvage an aluminum tranny from a melted vehicle.
I'd suspect the AX15 is the same either way. Novak doesn't go into particulars there so maybe try an end run. Look up part numbers for both engines with that tranny. Pilot bearing, throw out bearing, maybe input seals for the t-case...? There will (very likely anyway)be a difference between an auto t-case and a manual one. And Jeep, as far as I know, used 4 different configurations for the NP231. 21 and 23 spline inputs as well as a "short" or "long" input. And maybe a combination there in?