We know Ronnie would know but he dislikes differentials - LOL BUT maybe, just maybe, if his dementia is kicked in he may pipe up so cross your fingers and hope he does He's a pretty helpful guy I am gonna go with he will Not sure if that info is in the big giant 4 inch thick shop manual and if I were at home I would look in mine for you - but, I'm not home sorry - good luck!
Yes, changing the bearing and U joints is not bad, as long as you have the tools required. The Spicer U joints have lifetime warranty.
Check for loose u bolts , loose leaf spring brackets to frame bolts , broken leaf spring , standard cab 3 rd differential shock absorber first .