All xj's are 21 spline unless they were a AX15 5 speed. All pougeot BA10 5 speeds were 21, autos were 21, everything but 5 speed AX15, which would be 90 or newer for sure is 21 spline. Some had a 242 case, in which case they may be a 23 spline, but it still bet on 21 if its behind a AW4. I dont beleive any xj's came with a 241. grand cherokee zj's came with a 249 fulltime case behind the v8 and some 4.0s. all AX5 are 21 spline as well.
im in a dillema too... forgot the BA10 was 21 spline, so i did a sye on it and when i went to put it in my yj... oops, no fitty.
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