727 internal scraping noise

I was hoping for a cracked flex plate was making the noise, maybe a bolt in bell housing, but I know better. I don't buy lottery tickets because I know I'm not lucky. Pulled the transmission today, lots of metal shavings in the pan. Will need to come apart so I can figure out what caused it , learning is hard sometimes. New to transmissions, paid a transmission shop to go through it and always worked well even in drive, and reverse. Didn't slip just made noise. Hopefully trans can be saved. Did grind and shudder while coming to a stop, the car went in the garage at that point.

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