The only experience I have with Torque Tube is on a '50 1/2 ton.. I don't really get it either.
Near as I can figure, it's a regular U-Joint inside a tube.. for whatever reason.. but I found the service manuals online to aid in getting the '50 3100's Torque Tube driveshaft off and out of the way to pull the tranny for a clutch replacement.
Here's a link to the 1942 and 1946 Shop Manual courtesy of The Online Manual Project
1942 and 1946 Shop Manual
