Someone correct me if I'm wrong...
First is that there were at least two, maybe three different 3-speeds used '47 to '55 1st.
Second, '47 to '54 all have the closed driveline, while '55 1st (all '55 ADs) have an open driveline.
Third, there is one more transmission option in the mix, which is the Hydromatic.
I believe, and this is where I'm a little uncertain, that each transmission option means a different drive shaft and torque tube (where relevant).
Most of this is information I've picked up here, so if I've gotten any of it wrong, please someone correct me...
