Originally Posted by Pre '68 Dave
The only thing you will need to address is the master cylinder mount.
The four speed is wider than the three speed, so the mount wont quite reach the new transmission.
You can simply put shim washers between the mount and the transmission, or find a three speed mount.

Thanks Pre ‘68 Dave. No difference in Torque tubes are there?

Care taker of a 1946 1/2 ton. Pretty much period correct original. Danny T, from B’ham, Al