Transmission interchangablity?

[EUREKA]

I have an AW4 transmission from a 1991 4.0 MJ. I'm not seeing any difference between it and the AW4 in my 1988 MJ. I was wondering what years and models have identical AW4's to my 1988 4.0 AW4 MJ? Also what are the deference in AW4's from these,

 

• Jeep Cherokee (XJ):

  • 1991 to 2001 models equipped with the 4.0L inline-six engine.

• Jeep Grand Cherokee (ZJ):

  • 1993 to 1998 models equipped with the 4.0L inline-six engine.

• Jeep Wrangler (YJ and TJ):

  • 1987 to 1995 models (YJ) with the 4.0L engine.
  • 1997 to 2002 models (TJ) with the 4.0L engine.

[Pete M]

spline count matters if 4wd.  renix years were 21, later are 23.

 

there's a big AW4 writeup in here: 

 

 

[EUREKA]

Thanks

[EUREKA]

Is that the spline count on the planetary gear in the t-case and transmission output shaft?

[ghetdjc320]

1 hour ago, EUREKA said:

Is that the spline count on the planetary gear in the t-case and transmission output shaft?

That’s correct. Transmission output shaft and transfer case input. 

[derf]

There are changes in the AW4 over the years.  Good info here:  https://naxja.org/threads/everything-you-ever-wanted-to-know-about-the-aw4.1053970/