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will a np231c bolt right up where a np231j was.i have a 95yj 2.5 5speed and the transfer case leaks,someone gave me a 231c,looks the same and would sure be easier to swap than trying to seal the one thats on now,would the splines match?both are 272 ratio
 

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I believe the "c" was more common in the cherokees, so it will need to be re-clocked in order to work in a YJ. And you might have a problem with the input gear since they were much more popular behind an auto than a manual trans.

re-clocking means to unbolt the input cone and moving it so that the drivers side of the t-case is up one bolt hole from where it is now. You will be able to see the difference if you take your t-case and set it with the new one side by side.

As far as the input gear, you should be able to use the one thats in your t-case, and since you will have the front of it apart anyway, its a simple swap, all you need is a good set of snap ring pliers.
 
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