transfercase slipping ??

[shawn]

so the last time up in the mountains I'm hearing like a bang and it feels like i imagine what a chain slipping on a sprocket would feel like. - i can only imagine this to be transfer case issues. today, up a different mountain, the same thing but a bit more often and not consistent with any particular speed or amount of throttle (but definitely only on the steeper parts going up hill). so i think its the transfercase slipping (231) but am open to opinions. (this is in an '89 mj)

so my question is, i have a '95 parts cherokee that also has that transfercase. I'm no real mechanic. - much hassel to change-out? anything i should be on the lookout for? ive never done that before but think if its not too big a bite i wouldnt mind trying it. both the truck and donor xj are 5spds btw.

thanks.

[jpdocdave]

what engine is the donor xj? if its a 4 cyl forget it, but if its a 6 you would be best to swap both the trans and t case. and iirc the t case off that xj is a different spline input than the pukegoat trans. 23 and 21 or something like that.

 

edit: if this is even your problem.

[kro10000]

It all depends what trans youve got in the MJ, if its an AX-15 youre golden, just swap t cases, itll be pretty simple/easy, if you don't then its a good time to swap in an AX

[A-man930]

I have the same thing happen in my truck. And I also have an NP231 from a later model XJ. I have heard there are some issues with the splines from different years

[shawn]

It all depends what trans youve got in the MJ, if its an AX-15 youre golden, just swap t cases, itll be pretty simple/easy, if you don't then its a good time to swap in an AX

 

tomorrow i will probably be on here asking how i can tell what i have in the mj for a tranny, and the xj, for that matter.

both are 4.0 btw. '89mj, '95xj. both 5spds.

[JeepcoMJ]

look in the DIY section for the thread about the difference between the ba10/5 and the ax15.

 

if you have a ba10/5, you need a t-case with 21 splines, with the proper length input. if you have an ax15, you need a 23 spline t-case with proper length input.

[johnnybebad]

if your MJ is a 90 or earlier it should have the 21 spline NP231 , if it is 91-92 it should have the 23 spline . the input shaft can be changed on them if you needed to , it involves tearing the transfer case down but it can be done, I had to do it on my 89 xj which I swapped a 93 zj transfer case into

[CWLONGSHOT]

BEFORE, you go to all that trouble.... Check your linkage for proper adjustment.

 

The chain certainly could be bad, but for it to "jump" teeth you would hear quite a racket from it on a daily basis.

 

1989-90 is a tough time to pin down what you have for a spline count. the advice given is of coarse good. Just remember its a Jeep and the whores at amc put in what they had available. So as soon as someone makes a stead fast list of "will haves" someone else shows up with a seemingly stock vehicle that breaks the mold. What you have is what it is, unfortunately, you just look to be certain.

 

CW

[Wildman]

BEFORE, you go to all that trouble.... Check your linkage for proper adjustment.

 

The chain certainly could be bad, but for it to "jump" teeth you would hear quite a racket from it on a daily basis.

 

 

CW

 

 

 

:agree:

 

 

From what you wrote with the "minor" banging, it could be as simple as the linkage not set correct, and jumping out of gear.

 

 

 

 

*CW - I agree with the rest of your statement, just wanted to highlight the linkage section* :D

[JeepcoMJ]

if your MJ is a 90 or earlier it should have the 21 spline NP231 , if it is 91-92 it should have the 23 spline . the input shaft can be changed on them if you needed to , it involves tearing the transfer case down but it can be done, I had to do it on my 89 xj which I swapped a 93 zj transfer case into

 

incorrect. please read before you post.

[one_bad_MJ]

yeah a 89 takes a 21 spline t-case

 

the ax-15 takes a 23 spline

[kro10000]

IIRC all AX15s are 23 spline, so if that is what you have then the rest is irrelevant, 89 was the change over year so it could be either trans

[shawn]

thank you gentlemen , and thank you pat for posting that, -as soon as this rain stops i will go out and find out exactly what i have in both trucks.

cw and wildman -i will definitely look into that linkage issue , that would be a great thing if my issue turns out to be a simple fix like that. although i didnt think it would be possible for the tc to just be not-quite-in like that. (like when a tranny slips out of gear, -it has to be manually put back in).

[johnnybebad]

if your MJ is a 90 or earlier it should have the 21 spline NP231 , if it is 91-92 it should have the 23 spline . the input shaft can be changed on them if you needed to , it involves tearing the transfer case down but it can be done, I had to do it on my 89 xj which I swapped a 93 zj transfer case into

 

incorrect. please read before you post.

 

which part ??

[Geonovast]

if your MJ is a 90 or earlier it should have the 21 spline NP231 , if it is 91-92 it should have the 23 spline . the input shaft can be changed on them if you needed to , it involves tearing the transfer case down but it can be done, I had to do it on my 89 xj which I swapped a 93 zj transfer case into

 

incorrect. please read before you post.

 

which part ??

 

The AX-15 was introduced midway in 89, and needed a 23 spline transfercase.

[johnnybebad]

thought we were talking about the aw4, my bad