727 internal scraping noise

I have a 73 dart with a 408. Transmission was working perfect until the other day, rebuilt with tci shift kit new seals and clutches. The motor was pretty warm from sitting in some unexpected traffic so I shut it off in gear, forgot to put it back into park when I restarted it, no neutral safety yet, fell a pretty significant shock to the transmission. Now it makes a scraping sound, like tearing metal, when I shift it into drive or down shifts after slowing down. Was really hoping it was a motor mount but checked all that. Seems to work fine but not a good sound and I'm not driving it. Sounds like something being drug around like a bad wheel bearing. Fustrating because I just swapped in a bigger cam and took out the cloyes timing set that was retarded, but that another story. Thanks for any help , hopefully the sprag didn't roll and destroy the case.