Stock splines are 31 for the half shafts, if you are talking about the input shaft, those are 10 splines stock. Many switch over to 26 spline input shafts...
lol, no, I know all those, I mean the output shaft of the tranny. My T-56 is 31 spline output shaft. I bought a 03-04 cobra terminator Driveshaft, how many splines is it?