Not sure what you've got, but maybe if I explain how my '54 sedan T-tube is set up it'll help. I pulled my rear apart to swap in a set of 3:55 powerglide sedan gears. 1st, remove tires & brake drums. Next remove rear diff cover and remove center block, spider gears, C clips and axle shaft gears. Pull axles out of housing. Undo the 10 or so bolts (nuts?) at the front of the housing. The diff center section will come out with ring & pinion still installed. Pull center section with torque tube attached from under car. You can undo the carrier bearing caps and the carrier & bearings & ring gear assy will come out. Remember where all parts go. Carrier bearing caps are like rod caps, gotta go back on the way they came off.
Next remove the two or three bolts and jam nuts that are located on front of the center section right where the t-tube goes into c-section. These set the pinion bearing load or location of bearings or something. Bonk the front of the driveshaft with a block of wood or brass hammer or something. After enough beating the pinion bearings will come loose and the pinion & driveshaft assy will slide out the back of the c-section. You'll see two pinion bearings, spacers, washers, etc. The pinion is dowel-pinned or riveted or something to the driveshaft.
Then you can look inside & outside of tube & center section assembly and see whats going on. At least on my car, the t-tube is riveted to the center section. Seems like the tube slides into the center section housing, and then rivets or something hold it together. I don't know if you can cut the rivets and then pull the T-tube out of the center section, then use hardened bolts to reassemble. Seems like you'd have to completely disassemble the unit to undo the tube from center section, even if your model has bolts or rivets or whatever holding it together.
Then like I said, the pinion is pinned to the back of the prop shaft, which is as long as the torque tube. So you'd have to have them separate it or ship it separate or something. Then I don't know if the pinion will fit onto your old prop shaft. And a shop must reassemble the unit to get the clearances correct.
When you figure out the fine details let me know, I'd like to know how it goes together.
good luck
chip
