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The input shafts could be different. There are 23 spline long, short and a medium I think from grand cherokees. Then there are 21 spline inputs as well, usually from 4 cyl vehicles.
 

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like the man says; what's the application? Biggest is just 21 spline for 4cyls, and pre-91' 4.0's and 23 spline for others. Not sure about 231HD or real new applications though.

Jay
 

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Not to sure, but I took one from a 88' auto 4.0L and put it in my 89' many 4.0L. Not to sure if that helps you out any but it worked for me. Both 23 spline
 

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I think all 231 are 23 spline unless they are behind a Peugeot in 88' and 89'. 21 spline behind an Ax-5. But there may be a difference in long and short input shafts. I think one is flush and one protrudes out like 1/2". I think
 

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Discussion Starter #7
Well my 92 xj 231 transfer messed up and i found a 94 yj with 231 so are they interchangable? the yj was manuel if it matters?
 

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Depends on what tranny the YJ TC was connected to. AX5 or AX15? What tranny is in your XJ? Look at the chart on Novak's site to see what interchanges.
 

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Even if teh input shaft are different-you can easily swap out the shafts in about 30 minutes from 21 to 23. Also-the vacuum lines are slightly different-I put a TCASE from a cherokee ( I think it had an extra C after the NP231 stamp) and the vacuum modlue was father to the rear-but the lines strectched. So-as long as you input shaft is still good-you can just change teh shafts out.
 

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drbowser3 said:
I think all 231 are 23 spline unless they are behind a Peugeot in 88' and 89'. 21 spline behind an Ax-5. But there may be a difference in long and short input shafts. I think one is flush and one protrudes out like 1/2". I think

CORRECT 21 spine for the BA 10/5 on the 88 and 89. Man. or auto all the same
 
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