front ujoint on the rear shaft on my truck had tons of slop which is causing some vibrations i have i feel. im going to change the ujoint again but if i recall when i changed it the first time it still had slop.
new yoke? any trucks i can get a spare yoke from that share the same ujoint? there is no chance ill find a 79-83 truck in a local junkyard

 

finding the yoke from 79-83 is your best best, later year trucks are going to have a different flange bolt pattern, unless you swap the output flange too.
if you have had a lot of slop for awhile you could also end up with bearing issues on your output shaft

 

everything seems good besides that front ujoint. rear pinion is tight and the flange on the tcase is nice and tight with no slop. i also wouldnt mind having to change out the tcase flange if i can do that. My plan was to change the joint again and tac weld the caps to the flange