Am I justified in my frustration?

I cannot see any way in hell the bearing is rusted bad enough in the housing to cause that....so.....here's my guess. The axle splines have to be super rusted to the side gears. Try several gallons of white vinegar and fill that puppy up and let it sit several days and try it again. If you keep going like you are, it really WILL be a broken POS. As it is now, you might can still make it good. Trust me when I say, vinegar works wonders.

With how fed up I am with it I think I’m done. I’m abandoning the B-body rearend swap for now. This was more fun than I can stand. Just going to move on to another part of the project for now. I slide hammered that ***** for 2 days and my hand is a little sore. My spirits are low. My wallets $300 lighter with nothing to show for it. My faith in my fellow Mopar people is broken. There’s a lot more jerks and crooks in this hobby than good guys.

I may just buy a Sure Grip and 3.23 R/P for the 8-1/4 in the interim.