Still the same old Aisin Warner tranny. Makes a lot of heat with the converter unlocked. You pull a steep grade with lots of slip, the converter really heats the fluid. You might gain some marginal improvement in at temp with rad airfow, but I'd let it go.
That's what I thought. Yea, the OP would probably be better off looking through the Cherokee threads. Lots of info on there about transmission coolers.
What I got off those threads was to pull the transmission out of the radiator and install a standalone cooler. About half put one in front of the condenser/radiator. The guys running 37/38+ tires install a separate cooler with its own fan and put it where it'll fit.
Mitsu never did a deep sump pan for the AW3, but there is a company out there that does sell one. The dipstick is on the PS side though. For whatever its worth. General opinion seemed to be leaning towards that not being worth the effort - what was really needed was a separate cooler and/or fan.
I'm not a huge fan of the in-radiator cooler. It is nowhere near as efficient as a properly installed stand-alone unit.