I am one that has heard of this swap, just never seen it. I so happen to have a wealth of info about this onhand.
Use a late 90's dodge dakota bellhousing on the ax15 to make it bolt up to the 2.5L. AX-15 trans came stock behind the dakota 2.5l, the bell housings can be found at yards, or search car-part.com. Prices vary from $50-100 for the bell housing. You'll also need a new pilot bearing from advance adapters thats around $20, and a mid 80's 4cyl camaro clutch $50-$150 depending on brand.
Full write up can be found here...The AX-5 to AX-15 Swap Thread - NAXJA Forums -::- North American XJ Association
Parts list, your needs will vary some depending on what all you already have with your old trans and what your new ax-15 comes with. Heres if you need everything.
For both INTERNAL and EXTERNAL Slave AX-15
96-98 Dodge Dakota bellhousing from 2.5L
Clutch Disc 84 Camaro 4 cyl 4 speed --- Centerforce P/N 383824 or Autozone P/N CP4198
Clutch Throughout Bearing --- NAPA P/N BRGN4093
Pressure plate --- Keep your stock 2.5L pressure plate for your year
Flywheel --- Get your resurfaced or buy a new for your year 2.5L
Clutch Slave --- Dodge Dakota 96 NAPA P/N UP360045
Clutch Line --- makes it easy to hook up to Jeep master cylinder to Dakota slave Advanced Adapters P/N 716130TJ + 716130H (call them at 805 238 7000 for your application)
Pilot Bushing --- Advanced Adapters P/N 716167 for .750" OD input shaft tip. If smaller .60" OD then reuse stock. Measure the AX-15 with calipers to find out.
T-Case Linkage --- Stock linkage from an AX-15 equipped XJ or NOVAK SK2X
Clutch Shift Fork --- See factory part numbers below if your external slave AX-15 did not come with the throughout bearing linkage
For INTERNAL SLAVE AX-15. You need these parts to convert the AX-15 to external slave.
4636 382 ----- Front bearing retainer (this part can be had from partsmike.com for less $$$ than the dealer but it is still ***
5252 053 ----- Seal front bearing (got it from the dealer its cheap)
5210 7555 ----- Clutch release fork (relatively cheap around $20 from dealer)
5208 7542 ----- Clutch release pivot (cheap from dealer or may come on the Dakota Bellhousing)