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Old 06-11-2013, 09:57 PM   #1
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np 231 question

I have a ax15 out of a 94 yj I need the transfer case will a 231 out of a xj auto fit?

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Old 06-12-2013, 06:10 AM   #2
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I would think as long as the input gear is the same as required by your 94 YJ it should be okay..

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Old 06-12-2013, 09:20 AM   #3
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I have a ax15 out of a 94 yj I need the transfer case will a 231 out of a xj auto fit?
Both are 23 spline but I heard that the length of the input shaft is bigger on a auto also the shift shaft is backwards
Can be cut down and the selector flip over?
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Old 06-12-2013, 09:59 AM   #4
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And u font belt ice the XJ used the CAD for the front axle so that port is missing on the T-case,
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Old 06-12-2013, 10:05 AM   #5
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Yeah you will need to either do a posui cable to engage your front axle, or swap in a solid axle on the passenger side. A solid axle is the better option. You might be able to swap the input shafts between the cases. It is easy enough to do, it just comes down to if the planetary gear is the same. Sometimes they will look and feel perfect even if the planetary is cut difference since the problems show under power. Just do your homework on the input shaft swap. I also think you will need to clock that TC if you want it to fit properly.
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Old 06-12-2013, 10:38 AM   #6
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Overkill hit the nail on the head!!



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XJ231 above



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YJ 231 above

Just a few minor differences. And I think the input shaft length depends on the manufacture of the trans. The XJ 231 was mated to a AW4 Auto and has a short input shaft.
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Old 06-12-2013, 02:50 PM   #7
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Overkill hit the nail on the head!!

XJ231 above

YJ 231 above

Just a few minor differences. And I think the input shaft length depends on the manufacture of the trans. The XJ 231 was mated to a AW4 Auto and has a short input shaft.
Well the thing is that I don't have neither one I've been looking for one for yj but down here in Texas are hard to find there are plenty for xj auto but sounds like a lot more than I can chew
Anyone with a 231 for yj laying around please
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Old 06-12-2013, 02:58 PM   #8
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Try JW Jeep in Sacramento, Ca. 800-924-9732. Not sure what shipping would cost but I was out there a few days ago and they had a bunch of 231's.
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Old 06-12-2013, 08:05 PM   #9
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Try JW Jeep in Sacramento, Ca. 800-924-9732. Not sure what shipping would cost but I was out there a few days ago and they had a bunch of 231's.
Thanks mbclark
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Old 06-12-2013, 08:34 PM   #10
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Old 06-12-2013, 08:37 PM   #11
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Check Craigslist here in Hamptonroads Virginia have plenty for sale also there is a local guy that rebuilds 231 and sells them starting at $550.00 fully rebuilt.
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Old 06-12-2013, 09:09 PM   #12
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Check Craigslist here in Hamptonroads Virginia have plenty for sale also there is a local guy that rebuilds 231 and sells them starting at $550.00 fully rebuilt.
Sounds like that guy is making some good money. Those things usually go for $150-$250 in working condition. They better have brand new chains bearings synchros and most importantly an SYE for that price.
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Old 06-12-2013, 10:24 PM   #13
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Sounds like that guy is making some good money. Those things usually go for $150-$250 in working condition. They better have brand new chains bearings synchros and most importantly an SYE for that price.
I agree with overkill there's a lot on ebay for sale 400-500 when you can get one for xj for 70 bucks plus s&h just an example

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