Depending on how short it needs to be you can usually get by with just one cut in the portion that is pretty round all the way back. We used to use a pipe cutter that was capable of handling 4 inch diameter stuff, but with today's modern stuff a lathe or even a horizontal bandsaw or chopsaw could work too.

I think it is Speedway that sells a kit to respline the middle driveshaft, all you do is cut and weld the new end on it. I will be going that route if and when I ever get to the 46 flathead I am going to build a car around.

Don