Here is 3/4 ton torque tube (Front propeller shaft) rebuild photo album.
https://pbase.com/dennygraham/driveline&page=all

Front propeller shaft illustration
http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0452.htm

Attached is front enclosed propeller shaft and rear open propeller shaft parts for 3600 3/4 ton truck.

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