Tranny Swap or Rebuild

I have a 99 4.0 XJ automatic and would like to have a stouter transmission. What are my options without having to go into a ton of fabrication. Is there any upgrades to these trannys? Like having it professionaly rebuilt and the valve body worked to increase line pressure? Any input?

AFAIK there are no shift kits for the AW4. There is a valve kit out there for $500 if you are really itching to spend money on the tranny. Other than that your options are beefing up the torque converter (fab work) or modifying the TCU somehow.

The main thing I read about the AW-4 is it generates more heat then most automatics, and most of the "modifications" to them seem to center around improved cooling.
There's also the FUBAR 1-2 shift pattern, which seems to drive a market for aftermarket manual controllers.

Are you having a problem with yours, or is it more of a "preventative" upgrade?

I'm just looking at options. I'm not having any trouble right now and I will run it till it dies, but I want to know what to do when it takes a dirt nap.

The AW-4 is the only trans ever offered behind the 4.0 in a Cherokee. The early Wrangler had a Chrysler A-999 three-speed that would be a mechanical bolt in, and I think there were a couple different Autos offered in the Grand Cheerokee with a six. These would all "bolt in" without a ton of adapters, etc.
Problem is:
A-999: No overdrive, purely hydraulic, Engine computer would probably have a fit.
Anything out of a Grand: Transmission probably wouldn't like the control signals from the engine computer, and the engine computer would, again probably have a fit. Any swap would probably require a new engine computer, and a separate controller for the trans.
Any thing else is fab, Fab, FAB!
I'd say get a spare AW-4 if your worried about it breaking.