Hi Big Caddy, welcome to the Stovebolt!
I don't know the answer to your question, but I think there was more than one torque tube length. Maybe my response will move your question up higher and someone who knows will respond.
Where in the Seattle area are you? I know where there is a '52 GMC a ferry ride from Seattle that is now missing its 3-speed that you could probably get the torque tube from pretty friendly.
