I've never seen a production deep pan for an AW-4 at all. A member here, GoJeep, made one a few years ago. That's the only one I've ever seen. If someone does make a deep trans pan for the early(87-forward) XJ auto, the same pan will fit the '00.
The only thing I can think you saw was a pan for the '84-'86, which would have had a Chrysler sourced TF-904, which several companies do make a deep pan for.
Thanks tbburg for the useful post. You are correct in that I was referring to the '84-'86 models for the deep trany pan. PML makes one of the Jeep Liberty 42RLE, but the Jeep Liberty also shares the same trany as the Wrangler, Nitro, etc.
I agree the only benefit of a deep sump pan is that it adds volume of ATF which in turn keeps the tranny/ATF cooler- some employ fins to add to the cooling effect. You can accomplish the same thing by adding a larger and external cooler infront of the rig- without scaraficing ground clearance.
You can pick up a nice B&M universal kit from Pep boys for about 100 bucks. They also make a compact unit you can mount anywhere with a remote 6" or 8" waterproof fan on it.
Summit sells a variety of coolers that are "inline" that are 12 or more inches long and are finned tubes like a baseboard heater that you can plumb inline if you want to keep in the intank cooler.
Not everyone who owns a Jeep Cherokee is needing to preserve every square inch of clearance space. Lift Kits and skid plates are used to offset clearance issues. As noted above, the main advantage is to hold more fluid. Obviously a deeper pan will hold more fluid, thus providing more cooling. The Aluminum pan and fins would also reduce transmission temperatures. A magnetic drain plug would capture metal shavings, keeping your fluid clean. We already have a drain plug, so that’s not an issue like it is with most trany pans. A temperature sending unit would allow you to monitor transmission temperatures. The larger capacity is nice for those of us who tow.