ok so i got a 89 xj with a automatic trans a inline 6 motor with a 242 tcase. i wanna go to the local yard and pull another case and put a slip yoke in it and a rebuild kit all on the bench so my jeep isnt down and i can just pop the new one in. my question is how do i know what my spline count is where it mounts to the trans before i get one from the local yard and find out its wrong. i know the 242 is the same from 88-93 and diff from 94 up. when i say diff i mean the input bearing size. the early ones are 24mm and later ones are 16mm. any help would be great

 

This help?

AW4 spline count

The AW4 had 21 splines through 1990. In 1991 (the same year the 4.0 HO was introduced) the AW4 splines increased to 23.

 

yea so ill need a 6cyl auto trans and a tcase with a 242 from a 88-90 cuz that has the 21 spline count. mine is a 89 with a 6cyl and auto with a 242 so it can all match up thanks.

 

is this a know fact or where can i find info on it?

 

http://www.novak-adapt.com/knowledge/np242.htm

 

Ya beat me to it Frank!!

That's where I got it from. I just condensed it for simplicity.

 

Have I ever bull****ted you? LOL.

 

no so this limits my search 88-91 ill have to find not much of a choice

 

Through 1990 not 1991.What about 87?

 

The earlier Jeep AW4 has a 21 spline output shaft for connecting to the transfer case input shaft. With the release of the HO 4.0L in the 1991 the AW4 was upgraded to a 23 spline output shaft.

and thats straight from the site when i looks up info on the aw4 trans

 

Early 242s from 1988 through 1991 featured a conventional mechanical (cable) drive speedometer output. so since i have a 89 ill need 88-90 cuz 91 starts the ho motor and 23 spline count. i think i found all the info my self haha

 

Correct. But why are you not including 87?

 

no

 

Why?

 

Early 242s from 1988 through 1991 featured a conventional mechanical (cable) drive speedometer output. In 1992, Jeep introduced a three-wire, digital square wave Vehicle Speed Sensor (VSS), in the vein of modern automotive systems.

thats about the tcase