Mike, swapping the tc input shaft is simple but it does require enough
experience to be comfortable with splitting the case. Be sure to
order the input shaft with the right gear cut and bearing step, though
- took me 2 tries to get the right one when I swapped the 21-spline
out of my 88 for a 23 spline. Wrong bearing step won't fit but the
wrong gear cut will - then howl like a banshee! I may be wrong, but
it seems like the tailcone is is the same and just the speedo carrier
and drive gear assembly that goes in it changed.

It's not a particularly difficult job but it will cost a bit. I got
used input shafts assembled with bearings and planetary gears for
something like $80 from Sooner Jeep. ISTR that the new input shaft is
in the neighborhood of $200 and you need at least a small press (or a
BIG C-clamp) to install the pilot bearing in it. DO NOT try and
change the ring gear for the planetary reduction gears!

On Tue, 1 Jul 2003 15:41:14 UTC "Michael O'Brien" <micobrie@cisco.com>
wrote:

> Hi All,
>
> I was wondering if any of you know what it would take to put a '93 YJ
> 23-spline NP231 in the following rigs:
>
> 1. 88 YJ 4-cyl - spline count is different. can the input shaft and tail
> cone be changed(tail cone for 88 speedo).
>
> 2. '93 ZJ Grand Cherokee w/ auto tranny
>
> I'm selling my NP231(got an atlas) and there are a few people interested but
> have the above rigs.
>
> Thanks,
> Mike
>
>


--
Will Honea <whonea@codenet.net>