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21 or 23 spline AW4 identification

tchase

NAXJA Forum User
I've searched in the past without much luck, and may have already asked: Is there any definitive way to tell the difference without actually splitting the tranny/t-case and counting splines? Looking at doing a 242 swap on the XJ and I'd like to know which one my late 90 model year XJ has for sure so I can source the right donor t-case before tearing the jeep apart?
 
What tcase does it have in it now? If it has the RENIX efi system with a np231 then 21 spline is a safe bet.
 
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