Charlie,
This is the link that fits you better.
https://www.stovebolt.com/techtips/axles/1%20Ton%20Upgrade/Be careful ordering parts designated for a 3/4 ton. The one tons are sometimes very unique beasts and 3/4 ton parts listed saying “fits 1 ton also” may be downright incorrect. For example, brake drums. If you got some that are decent, consider yourself lucky. I bought a junk 1 ton just for the drums on it.
I did this gear swap in my Canadian 51 GMC 1 ton 9434 and it is great. Yes, it is as simple as bolting it in. GM is like LEGO! The hard part is finding that gear set. Rock auto isn’t going to have the complete gear set. You’re looking for a wrecker or parts truck.
