The Mud Pit > Wrenching

np231 swap

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GreenGrandV8:
i have a zj with the np249 t-case tryin to swap the 231 in but the 231 i got has a big vacuum switch on it that my zj doesnt have.... can i still use it??

calvynandhobbs:
Sounds like you got an older 231 out of a XJ or YJ that had a vacuum disconnect front axle. As far as I know you should be able to just plug that spot since you don't need the vacuum for your front axle.

GreenGrandV8:
yeah... thats what i figured. its a 23 spline which is what i need. another thing i noticed is the speed sensor on it looks different but i think where it sits into the case itself it might be the same... im just tryin to figure out if i should try and use it or bring it back to the junk yard and try and have them find me a different one..

calvynandhobbs:
The older ones have a mechanical speed sensor and at some point they put an electronic speed sensor in there so I don't know if you'd be able to get the older 231 to work at all if you want to see how fast you are driving. I don't have much knowledge in that department, but you may make the swap a little easier if you find a newer 231 that is set up with the same type of speed sensor and everything as is currently in your Jeep. I just found this thread about the swap you want to do. Looks like there are some extra links to do more reading and it appears there may be some input shaft differences in the different years for you to think about.

http://www.jeepforum.com/forum/f13/zj-np249-np231-swap-question-596306/

GreenGrandV8:
yeah im going to be swapping the input gear for sure.. i been doin a lot of research.. one thing that crossed my mind is i was wondering if maybe i could just swap that tail shaft piece with a newer one with the other sensors in it if that would work or not... i dont really know why it wouldnt.. what do u think?

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