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Discussion Starter · #1 · (Edited)
I currently have a 89 xj with 4.0, AUTO, and NP242 (it took a poo).

I want to replace it...

FJ-DAVE has a 231 from an 87 Comanche that has a 4.0 and a 5 speed...

he says its 21 spline input, is this the same as mine? I really dont want to pull mine again, just to look...

:D thanx
 

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possibly, there not hard to get to into them to try it.

not even all 231's have the same size input shafts even if they are the same size. I figured this out piece-mealing a case together out of a couple different ones. there is a long and short input shaft and there are two sizes of the short (f by maybe a 1/8" or so). its sort of a crap shoot as there were so many combos. someone might have a detailed breakdown but I doubt anyone spent the time to create a decent database as it's so easy to use the trial & error technique...
 
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