Jorb, looks like you're right on a few points. I need a different u-joint assembly and the part in your illustration is nowhere to be found at the moment. If someone comes across this assembly, I would love to know about it. The transmission casing Dave shows earlier in the post would also be most welcome.
Refusing to send the truck to the junk yard, I'm going to try to get an alternate u-joint to work. Hope I don't need to work on the clutch before I find a solution.
A million thanks to all who responded. I'm an absolute newbie, desperate to put this beautiful old truck back on the road.
