Trany And Tcase Swap Question

[88mj2.5]

Will a 5 speed and t case out of a 1995 yj i4 bolt up to my 88 2.5 mj looking to so a 4x4 swap and trying to figure tcase out and the extra gear would be nice any feed back would be great thanks

Cody

[mnkyboy]

The clocking of the t-case will be a little different but it should fit.

 

 

[88mj2.5]

So the bell housing will bolt up to the back of the block?

And i don't think that would make to much of an issue slightly different drive shaft angles?

[Bounty Hunter]

Yes, they'll bolt up, but the front output side of the transfer case will be closer to the tub than if using a XJ/MJ transmission. There may be fitment issues here.

[Geonovast]

5th gear won't be much use to you. The 2.5 tends to dog pretty bad in 5th with 3.55 axles. I did the same thing with an MPFI 2.5, and didn't even bother with 5th unless I was doing more than 70 on level ground.

 

You can still use the trans obviously, for the 4wd conversion, but if you rely on 5th a lot, your mileage is probably going to go down. Just something to keep in mind.

[Bounty Hunter]

He's right, forgot the 2.5L 4spd was plagued with 3.55 gears, despite my MJ having the same setup LOL.

[88mj2.5]

Hmm thats good to know the front axle i am looking to get has 3.55s i was gonna jack the back up to check before i buy it and could tail shafts be swaped to make the 4 speed work?

And thats shocking never knew that with 5th gear I'm still pretty new to the mj world lol

[88mj2.5]

A front axle *

[Bounty Hunter]

No. You can use the 5spd, just don't plan on using 5th gear unless you gear the axles lower.

[88mj2.5]

Ok sounds good thanks for the help

[mnkyboy]

With 3.55s and 33" tires I rarely could use 4th gear.

 

 

[88mj2.5]

Wow thats nuts prly to to at least 4.10 before it gets lifted then

[mnkyboy]

I'm at 4.88 now and it finally feels like I could use 5th.

 

 

[88mj2.5]

Wow hows the mpgs with that combo?

[mnkyboy]

Not sure, I started car pooling just before I did the gears so it doesnt see much time on the road anymore.

 

I would guess 18-20mpg but fuel mileage tends to average a little lower here due to terrain and our ethanol blend gas.

[88mj2.5]

Thats awesome I'm glad to hear that i wanted to build the truck but i didnt wanna loose the mpg