Auto Trans swap help.

[Pete M]

car-part.com might be of help with junkyard searches   

 

be sure to flesh out your forum signature with what you have.  and you should start build threads on each of your Jeeps!   

 

MJs here:  https://comancheclub.com/forum/8-member-projects-your-comanches/

 

other cool stuff here: https://comancheclub.com/forum/40-member-projects-other-cool-stuff/

[JEEP_cannible]

Thanks Gogmorgo,and Eagle for the help.The list really helps explain a few things.Knowing now that the trans out of the WJ is not a good swap for the MJ I have .Helps out even more with what I was trying to do.I also pushed to find out some more things about the drive train in the ford.The axle's are converted to 6 lug the rear is actually a ford 9'.I still need to check the tag again to see if its a posi. or limited slip.Their also the same width as the XJ and my MJ. Both are hung with leaf springs. so their not going to be much help. The t case is out of a J10 truck,(M715 or something close to it).I also found out that its a lot like an older version of like the Atlas t case.Heavier, larger,and the added PTO.It could make for a good swap in a crawler with a  2wd trans.I was also told the check the gearing in the axles before I use them in anything.The company that did the mini truck conversions is known for not matching the gear ratios.This part didn't sound right to me,but a friend that owns a couple said.The front could be lower geared than the rear so it would pull harder when your stuck? That just didn't sound cool to me.He said that they had a dash plate that said something like( not to be driven in 4wd for extended periods of time).I couldn't find one in either of the two spots they should have been.I'm going to check closer anyway better safe than sorry.If I can find a trans this hole set up maybe going under my XJ. I may have a trans for my MJ. after all. I love my truck,and thanks again for the help.

[Eagle]

On 3/31/2019 at 10:58 AM, gogmorgo said:

The WJ trans would probably bolt onto your MJ's 4.0, and then you'd have to make your own mount for the crossmember. The tough part would be getting the computer controls to work. If there's a standalone computer running it that wouldn't be too difficult, but if it's built into the ecu, then it gets more difficult. It's not the same automatic from the MJ/XJ platform so you won't be able to run it off XJ computers, either. 

 

 

The WJ used a PCM (Powertrain Control Module). It handles both the engine and the transmission. Not compatible with an MJ unless you upgrade the entire system to the WJ electronics.

[mjeff87]

Small little tidbit to add to this, but it's the tiny little things on a project like this that end up driving you nuts......if you do swap an auto in, in addition to everything that Paradise lists out so well, you're going to need new (shorter) flexplate bolts to bolt the plate to the back of the crank.  Flywheel bolts are longer than flexplate bolts and won't work.

 

I'd hate to see you (or anyone) go through all the work and finally get ready to bolt everything up and find out you need different hardware.  Which always seems to happen to me at 0200 on a Sunday morning, when nothing is open.  LOL.