Tappy Posted July 13, 2006 Share Posted July 13, 2006 I need to get rid of my 2.5 and switch to the 4.0 (the 2.5 is dead and why not upgrade?). By looking at it, it doesnt look to complicated. its a '89 as well as the 4.0 I'm getting. Pretty mutch what I'm asking for is anything that i should know/look out for before doing this Hey btw great forum! :cheers: Link to comment Share on other sites More sharing options...
Pete M Posted July 13, 2006 Share Posted July 13, 2006 You'll need just about everything from the donor rig. Wiring, motor mounts, exhaust, cooling system, transmission and maybe even the t-case. Oh, and driveshafts too. If your's is an 86, then you'll need the front clip too (radiator crossmember, hood and latches) Link to comment Share on other sites More sharing options...
jage Posted July 14, 2006 Share Posted July 14, 2006 Yeah my AX5 tranny is like a 21 spline output and the AX15s are 23 or something. So you should probably get the Tcase or research. I've read you have to relocate the motor mounts in the MJ. I wasn't sure about it so I backed out of doing a 4.0 swap - for one reason my 2.5 is in decent shape, plus I had an AX5 laying around, and the dashboard would have been out of a Grand. The only thing I had to buy was a clutch. So it was a better choice for me - but yeah if you're 2.5 is trashed why not upgrade? Good luck! Link to comment Share on other sites More sharing options...
Tappy Posted July 14, 2006 Author Share Posted July 14, 2006 Alright, well it looks like ill be best off if i just by a doner rig. I was hoping i wouldnt need a replace anything behind the tranny :headpop: well anyways ive got a 4 speed now and and a 5 speed would be nice, so in the spirit of replacing things with better things ill see if i can find a doner rig with a 4.0 and a 5 speed tranny. sweet :chillin: thanks! Link to comment Share on other sites More sharing options...
JeepJeep82 Posted July 14, 2006 Share Posted July 14, 2006 I just completed the same swap. I have a 90ish mj now. The wiring in the cab will be fine. You just have to swap the engine harness. That does include the brain. I went from a 2wd, 2.5, 4 speed to a 4wd, 4.0, auto with a 242 t case and every thing bolted in. I had a 89 donor xj. Just watch everything you take apart and it is not bad. On my donor I labeled all six injectors on the wiring side because I have heard to many nightmares about getting them staight. Every Question I had was covered in a forum somewhere so it should be no problem. Good luck and if I can help let me know. Link to comment Share on other sites More sharing options...
Tappy Posted July 24, 2006 Author Share Posted July 24, 2006 Its finnaly under way, the drivetrain should be out by tommarro night fallowed by the arrival of the donar truck tuesday. caaannnt wait to finish this prodject, i have yet to even drive an MJ. I'm sure ill have more questions along the way so ill talk to you guys then Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now