i still have the torque tube. i think the whole truck is original. anyway, i was told the ujoint was replace by PO, but i don't even see one, much less know how to check it for play. i'll check the manual. thanks very much wrenchbender for the info.
tony

Overland Blue, 1953 GMC 1/2T, 100-22, 228/1bbl, 4sp/4.10 6v, shortbed/fender side/5-window.