input shaft (yea, that good old debate, revisited...)

[rockhardzj]

OK, I have a NP231-J out of a 93XJ, the XJ had a 4.0/ax-15 combo.

I am in the middle (near end, really...) of swapping the tail shaft and tail housing and other gizmos inside to stuff from my 98XJ.

The 98XJ had a 4.0/AW4 combo, with a NP231-J

 

Before I finish putting my 231 back together for the SECOND time, I want to know if I can leave the 93's input shaft/gear/whatever it is alone so it will hook up to a AW4 from a 96XJ. Keep in mind, this tcase is being swapped from a 93 w/ax-15 to a 96 w/aw4 trannies. The engines, I know have no differences.

 

I think i have all the details, I just need an answer.

[Twisty]

I believe that the 21 spline 231's ceased to exist with the Renix system. The 23 spline units came with the HO motor.

[rockhardzj]

So then, I should be all fine and dandy, and be able to bolt it up, and not have to smack myself across the face for not changing input shafts...

[carnuck]

Just check the depth of the input gear vs the output shaft's extension and you'll know for sure. I have to put in a 1" spacer to run a NP208J behind the AW4 I'm putting into my '83 J10.

[tjbliley]

Go here and look at the info required for the adapters. It is fairly acurate.

http://www.advanceadapters.com/

[Bounty Hunter]

www.novak-adapt.com/knowledge/np231.htm states it should be the same input shaft between the two (except for the gear cut, which won't matter in your case). I would measure to be sure.

[rockhardzj]

Novak says my shafts are the same, so I should be good.

[pingpong]

As their site probably pointed out there are 2 different length inputs IIRC