I looked online and found that the u-joint "repair kits" offered by the Chevrolet parts vendors were said to fit '40 through '54 trucks with both 3 and 4-speed transmissions. Went to the shop today and pulled a u-joint assembly off a 1954 truck 3-speed, and also the front yoke from my busted original C8 4-speed transmission.
Sure enough, the u-joint from the '54 3-speed fit the C8 4-speed front yoke exactly. Both rear yokes are the same with 17 splines, but the front '54 3-speed yoke is smaller in diameter than the C8 4-speed one..
Alex, you are welcome to any of the parts in the photo, as I'll probably never need them...
Thanks, David
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