Apparently, this is the hot setup for overdrive in a Model A.
In conjunction with our Model A to S-10 T5 adapters, mentioned here, I am looking into offering the Ford F150 RTS conversion.
The first step in this conversion is to remove the original tail shaft and make a retainer plate that can accept the original Model A torque tube ball. The blue part is a 3-d printed test piece and will eventually be made out of aluminum.
The output shaft will need to be shortened and re-splined for the Model A u-joint. Surprisingly, this trans lends itself very well to this conversion.
I will add more updates the further I progress along...