Jump to content
Sign in to follow this  
M1A1TankerTom

Swapping a YJ T-case into an MJ

Recommended Posts

I have a 89 MJ with an AW4 and a 21 spline 231 t case. Was looking at putting a 231 t case from a 95 YJ with a manual tranny into my MJ. Both are 21 spline, but I have read conflicting things online that they may be clocked different? Anybody know if this would be a direct bolt up or is modification required?

 

For info I'm looking at swapping because the YJ case has a 4:1 Tera low, HD chain, and a SYE kit.

Share this post


Link to post
Share on other sites

The clocking was done at the transmission ... The pattern in the tail housing was offset differently between XJ/MJ and the YJ/TJ.

The transfer cases were the same for all jeep vehicles, 242 or 231. Only the input gears were different, but rarely an issue enough to worry about.

 

Sent from my SGH-I337M using Tapatalk

Share this post


Link to post
Share on other sites

I don't think a 95 YJ should have a 21 spline output on the 5spd (AX-15).  It should be 23.  I could be wrong, since I don't feel like looking it up.

 

But as said, otherwise they are the same.  If it fits, it fits.

Share this post


Link to post
Share on other sites

All the 2.5L Jeeps retained 21 spline outputs (AX5), only the 4.0's switched to 23 spline outputs. I'm going to guess his 95 parts source YJ had a 2.5L engine.

 

Sent from my SGH-I337M using Tapatalk

Share this post


Link to post
Share on other sites

Worst case, you could always swap the guts from the YJ into the MJ case.

Share this post


Link to post
Share on other sites

Worst case, you could always swap the guts from the YJ into the MJ case.

 

Not with the TeraLow.  He needs the correct one.  It uses it's own front case half, input/planetary gears and whatnot else.  So if it is the wrong version (23 spline) he's hooped, you can't just swap the input or whatever else.

 

But as RockFrog says, if it's the 2.5L version it is 21 spline.  I always forget about the 2.5L.

Share this post


Link to post
Share on other sites

It's a 21 spline for sure. I'm actually thinking about not going through with the purchase now. I think it's a good deal, but there is so many bad reviews about the Tera Low.

Share this post


Link to post
Share on other sites

It's a 21 spline for sure. I'm actually thinking about not going through with the purchase now. I think it's a good deal, but there is so many bad reviews about the Tera Low.

 

Oh, it's a piece of garbage.  I wasn't going to say anything to bring you down, but seriously I would never even consider running one.

Share this post


Link to post
Share on other sites

X2 ... With the limitations they have due to poor input design, not on my wish list either.

 

And for the cost, there are several better options.

 

Sent from my SGH-I337M using Tapatalk

Share this post


Link to post
Share on other sites

 

 

Worst case, you could always swap the guts from the YJ into the MJ case.

Not with the TeraLow. He needs the correct one. It uses it's own front case half, input/planetary gears and whatnot else. So if it is the wrong version (23 spline) he's hooped, you can't just swap the input or whatever else.

 

But as RockFrog says, if it's the 2.5L version it is 21 spline. I always forget about the 2.5L.

Good catch. I stand corrected. I knew the planetaries were different, I didn't know it had its own input.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...