It took me 5-6 tries to get to the bottom of my powerglide issues this year and a professional builder spotted the issue being the case. Tired a new case and it cracked on its 7th pass in a spot that they are known to crack. I updated to an ATI case and all is well. Like I said before as you age it gets harder. Harder to get something done and harder for it to beat you. It’s one thing to pull a transmission by yourself on a lift and another if you are working on the ground. In my eyes you did the right thing and can now move on. For some of us our track days are dwindling away so we gotta make hay while the sun shines.