I am replacing my tc. I think I found one at the jy. my question is how do i count the spline. the one at the jy has 26 counting the ridges. I have a 1990 with manny trans. I think it would be a 23 spline according to the research i have done. so is there such thing as a 26 spline? or did I count it wrong. It is a np 231

the one at the jy says 231c on the tag and like I said i counted 26 ridges. thanks for any help.

 

seriously. nobody is going to help me out?
may be a dumb question for some people
but it is a serious question. I need some help
here, come on guys I know plenty of you know
answers to my questions. Is there such a thing as
a 26 spline 231? or did I count wrong? I need to
know so I can buy this tc tomorrow and install it.
my jeep is my dd and my wife is about to kill me
for driving her car.

 

I believe you counted wrong. There were only 21 or 23 spline np231 transfer cases in the cherokees, now I could be wrong on the years but I believe 91 and up is 23 spline and 90 and older was a 21 spline. Also you are going to want to find a 87-90 t case anyways because of the vacuum disconnect system.

 

Sounds like you counted the splines for the drive shaft, you need to count the ones on the input where it mounts to the tranny.

 

thanks. upon further research I think the one I found may be from a chevy. It said 231c on it mine says 231j. does chevy use a 231 on the blazers?

 

They did use them on the s10s and the s10blazers, and yes the c means chevy and the j means jeep. So I take it you were looking at a transfercase that has already been removed?

 

yes it is already removed. but I have been searching even more and I am pretty sure I have a 23spline ax-15. just don't know the length of the input shaft. I guess I will keep searching for another tc. and to be safe I will find another 1990 xj with the manny trans and i6. this will be a pain in the **** I'm sure.

but any advice you guys have is very much appreciated.

Josh

 

Oh you have manual, well I'm not sure you could be right and have a 23 spline, I think for autos of that year it would be a 21 spine, but yeah I would stick to the 87-90 year range, you should be fine. Good luck.