OK, here is my plan.
I have ordered some parts for another SM420 I have and am going to put it together for a direct swap. I am going to change the replacement from a torque tube to open driveshaft configuration. The replacement appears tighter than the one I am using and was blessed as good when I got it.
We will see. I am hoping it is much better than what I have, and keep me on the road. This is my daily driver so I can't let it stay down for long.
Hotshoe, what specifically are these 5 speed you are talking about?