I went to a one-piece drive shaft in my 47 3600, but I added a Gear Venders Overdrive to the back of my SM420. It adds about 14" to the back of the trany so the drive shaft is not as long as it would have been without it. I have the open output housing for a SM420 if someone needs it. I was going to go that route but decided to go with an overdrive instead.
