there would be a lot more then spline dia and count. bearing dia bearing width, final gear output, maybe spine depth, bearing surface on thge LSD to the bearing vs bearing surface on the carrier housing. and so on and so on. pressed on bearings and or vs play on this and that have to be right on or binding stress or play will burn up fast.

2001 5sp. K&N stock filter 215/70/15
If your check engine light is on at least you know the light still works