These posts are starting to make what is a simple job quite complicated. Let's determine what we are working with and go from there. The torque tube set up at the transmission might seem at bit strange but as was mentioned above once you get to look at it you will figure out where the bits and pieces go. Do not throw anything away until you have completed the job. The bolts which hold the u-joint together are not stock bolts as their head is smaller so they can fit in tight against the joint trunion.
When I did my job I ordered two sets of bolts and retainers from a reputable after-market source and when they came they were junk. The bolts looked like they were cast and truly not a high grade. The retaining clips had holes big enough in them that the bolt heads slipped through.
I ended up getting good used ones from some people on this forum.
In conclusion let me stress that the very best thing you can do to help you in this job is determine the model of truck you have a get the shop manual. It is a bible.

1949 Chevy 1/2-Ton
"Sedgewick"
In the Gallery
1989 Caprice