the 6spd trans is not an AX-15, but would still bolt up (assuming you could ever find one).
The TJ/YJ unit is slightly different, but it still works. I have one in my 88. If you found one, you'll still need to track down an XJ/MJ shifter (the wrangler one is taller, but still works) and the XJ/MJ trans mount and crossmember (very different in a wrangler). It will clock (rotate) the t-case up a bit, but that's pretty easy to overcome and will give you better ground clearance under the t-case.