89 MJ 4x4 conversion questions

[JFAComanche6]

Can I use a 10/5 tranny with a wrangler 231 t-case for a 4x4 swap? and can I use a front d30 from a 1990-96 xj axle on my 89 MJ?

I'm also not sure how to read the gearing off the tag on my d35 rear end.

[Pete M]

what year wrangler?

 

what is your engine/trans?

[HKB3]

The 10/5 is 21 spline output shaft, you would need a 231 from a 4cyl. wrangler.

What is your location? I have a 231-10/5 I am not using, the trans is stuck in 1st gear but the 231 is in perfect working order.

[JFAComanche6]

I have an 89 MJ with a 4.0 and the 2wd 10/5 tranny, and I live in the texoma area of north texas.

[JFAComanche6]

And the wrangler is an 88, probably an I6. I'm wanting to pull the 10/5 out of it but am not sure if I have to bolt a different tcase on it-

[Pete M]

the 10/5 only bolts behind an inline 6, so either it's a 6, or it's not a 10/5. :thumbsup:

 

If it is a 10/5, the yes you can use it. there are some differences though. the shifter tower is likely different and you'll want to swap over yours (I know for sure this is the case with the AX-15s, but haven't seen a wrangler 10/5 to confirm). and you'll need the t-case shifter handle and linkages from an MJ/XJ. I'm assuming the 10/5 bellhousing in the wrangler will have the provisions for the MJ's CPS.

 

as for the axles, you should have 3.07s under the truck now. I'd take the opportunity to swap both axles out for something with a better ratio. I'd go for at least 3.55s from a 4.0/auto XJ.

[JFAComanche6]

Okay thanks this was very helpful

[JFAComanche6]

Off the top of your head, does anyone know how much they had to cut their 2wd rear driveshaft when the t-case was finally bolted on?

[carnuck]

If it has the rubber insert, then shops won't touch it to cut it down.

[Pete M]

I had my rubber insert driveshaft cut down, no problemo. :thumbsup: but i have heard of shops refusing. (mostly out of ignorance. just have them cut down the non-rubber insert end :D )

[JFAComanche6]

I don't see any rubber on my driveshaft, I'm not sure how theyd cut it I just don't wanna screw up my driveshaft and be without my comanche til I buy another driveshaft

[Pete M]

it's inside the axle end if it's there. what's the diameter of the driveshaft? the rubber isolator ones are bigger than the regular ones.

[JFAComanche6]

It's...pretty damn big, and heavy.

[Pete M]

if you reach down at the axle end, you'll find that there's an outer shell, a half inch gap, then an inner shell. that gap is where the rubber isolator resides. :thumbsup: