no no no no no. even if you could bolt it up the torque of a 4.0 would destroy it in no time. i used to have a cherokee that had a 2.8 and the ax-5. the previous owner used it just as a daily driver, never wheeled it, and broke the countershaft.
if you do a 4.0 swap you'd need an ax-15 which was stock behind these motors. you can also find them in v6 dodge dakotas, then you'd also need a jeep bellhousing as the dodge motor is a different pattern. also you need either the transfer case from an ax-15 or a new input gear for your stock transfer case. the ax-5 has a 21 spline output shaft while the ax-15 has a 23 spline.
there are literally millions of 4.0's out there as they put them in wranglers, cherokees, and grand cherokees so finding one should be cake. the wrangler was the most common 5 speed application though so the ax-15 might be a little tricky to find in the junkyard.
some may call it overbuilt. my right foot calls it future scrap.
Titan Engines in Ocala, FL. They have 3 year 36,000 mile warr. and have styles from stock to Stroker. They will work with you on add ons.( ignition, intake etc.) even install them for you. Cam sizes are customer choice. Find them on E-bay.
I got a 4.2 from jeepenginesales.com. They carry almost all jeep engines and have a great warranty. I want to say they have a 1 year unlimited mileage and 7 years limited on the 2.5. Prices vary a bit but the 2.5 is about 1700 including 399.00 for the core that you get back when you send yours in. I have had no problems with my engine after a year of use(110.6 miles round trip to work 5 days a week).
I have a usable 2.5 in East Central IOWA.......came out of a 93YJ with 85K miles.....was running when we pulled it. Send me a PM if you are curious.
"For Gawd's sake, put a RELAY in there or you could burn the whole damn Jeep to the ground" ...this quote brought to you by people who do not understand the law.....Kirchoff's, Ohm's, or Faraday's.
Violation of KISS shall always ring false in TRUE engineering. - ME___
Had 75CJ5, 89YJ, 93YJ. Have 82CJ7 & 95YJ____Not one burnt yet due to lack of relays.