This is a well written article on the 8 3/4 rear end from Mopar Connection on-line magazine written by Kent Will. I have read several good articles on this site and everyone should consider subscribing.
https://moparconnectionmagazine.com/heavy-duty-hogs-head-how-to-8%C2%BE-rearend-revival-with-yearone-yukon-gear/
Very informative, especially since I'm a short bus passenger when it comes to differentials. I'd love to tackle mine when the time comes. 10 years of prior machinist skills to utilize. It's supposed to be a 3.23, although it's currently a 3.91. I'd like to go back to a 3.23 yet cheat a bit and go sure grip instead of the one legger called out on the build sheet. I'm a bit apprehensive.
With your machinist background, I hope yours skills at rebuilding a differential are better than mine. I tried and failed. Had to pay a professional to do it correctly.