I have a rebuilt 66 4 speed trans (23 spline) that I was going to put in my 71 Bee however, the driveshaft I have doesn't seem to fit. I was told that all 71-74B body drive shafts are the same length. I am positive I have a -71-74 drive shaft. The yoke end on the drive shaft has a master key way that my tailshaft on my trans does not have. Do I have the wrong drive shaft? Does a 4 speed and an automatic for a 71-74 B body differ? Have I got the wrong shaft?