90' T-case on 00' AW4

[zfinger]

I've got a 90' MJ about to get a full 00' swap and I came across another hick-up. I'm swapping in the 00' motor and automatic transmission. My 90' t-case already has a SYE kit in it. I don't have the 00' t-case. Going 90' AX-15 to a 00' AW4.

 

So its a 231 with the 21 spline input gear. It'll need to be a 23 spline. What are my options? Can I buy the 23 spline piece I need and swap it out in the t-case?

[Jeepman]

Your 1990 AX15 should be a 23 spline already so it should be a direct bolt on...

[Blue XJ]

I picked up a 23 spline input for mine on another forum for $50 shipped. There is a change to the case in 94 i think, there is a thick and thin input bearing design, make sure you get a gear that matches yours.

[zfinger]

Your 1990 AX15 should be a 23 spline already so it should be a direct bolt on...

I hope you're correct. I've been doing some more reading and it appears you should be right.

AX15 - 23 spline

AW4 pre-91 - 21 spline

AW4 post-91 - 23 spline

[jpnjim]

Sounds like you already have the 23 spline,

but be careful if you do end up changing input gears, there was some kind of a pitch change, or two over the years, and you will know immediately if you have an incompatible gear.

 

Wrong input = sounds like rocks in a blender

[relyt120]

MAKE SURE YOUR AUTO TRANNY IS FOR A 4X4 ,2WD TRANNY CANNOT ACCEPT A transfer case

[zfinger]

MAKE SURE YOUR AUTO TRANNY IS FOR A 4X4 ,2WD TRANNY CANNOT ACCEPT A transfer case

 

The donor was a 4x4, just didn't come with the t-case.

[zfinger]

The internet didn't lie to me! Bolted right up!

 

00' AW4 will bolt to a 90' 231 off an AX-15

[Blue XJ]

Does the input gear engage properly?  There were 3 different length input gears over the years, just make sure yours engages enough to the output on the trans.

[zfinger]

80 Miles into the road test now, and yes, it works! 4wd works great so the spline lengths must have been fine.