trans input and output ?

[littlered351]

I've got an 87 cherokee pioneer, 4.0 auto with 231 t case.
I'm swaping in a lower mileage 4.0 out of a 93 and looking a autos out of a 92 and a 95. I've been told that the inputs are all the same but they had different spline outputs? Both autos i'm looking at were behind 4.0's and had 231 t cases.

 

[jfiscus]

When I swapped in my 93 motor I kept my 89 tranny and it's still running strong. Sorry I cannot help you with spline counts, but I'd just keep the orig tranny if there isnt a problem with it if I were you.

 

[MachineMan]

Sometime after '90 the AW4 trans output shaft went from a 21spline to a 23pline. The trans torque converter bolt pattern should be the same through 95+..

 

[jeepsrock]

The deal is sometime at 90-91 with the introduction of the HO motors they switched to the 23 spline tranny and tcases. As far as engine mating they are the same , so if you have a 91+ HO engine you can technically swap in a 90 or below tranny/tcase combo. Or visa versa if you have 90 you can swap in a 91+ tranny/tcase as long as you keep the tcase/tranny together.

Pete

 

[littlered351]

so for an 87 t-case I have to stick with a pre 90 trans or get a trans and t-case together and fix the output shaft on the t-case.

 

[jeepsrock]

all that you said is correct except that the output on the tcases are the same i think, that you may want to check.

pete

 

[littlered351]

claification. If I get a new t-case I'll have to fix the output. I have the AA HD SYE on the t-case I have.