I ended up just parking it until I get some more free time to take it apart. I emailed Cass/Dr Diff and he’s is thinking the side gear splines are stripped based on the symptoms it’s giving. He suggested replacing the 1 piece side gear kit. Digging in the innards of a differential is beyond my skill level. A kick in the jewels but what can ya do right.. when I assembled the axle/housing/diff the yoke and axle shafts spun together so there was no indication at that point. It obviously wasn’t under a load in that situation either. I’m likely gonna buy another center section and may use that opportunity to go a little tamer on gear selection. This was a 3.91 gear set. It would be fun but kill ya on the highway. Maybe a 3.55 will be in my future.