Thank you all. I've kinda determination that it has to be a valve body or something internal.
Yes it does hold it's self in park.
Gonna put the pan back on and take it in. Automatic transmissions are slightly out of my scope of work lol. I've only ever torn apart a 727 torque flite out if an old dart. This one's a years more advanced for sure.
I know this is likely not the case here, but long about half a century ago, I had a Chebby that cracked the valve body. No warning, just no go in any gear. I have no idea as to the cause, but it happened. I ASSume it lost line pressure due to the internal leak?
Thanks for all the help. Turned out the problem was the shoulders that the bolt from the motor turns were smoothed out, so turning the motor did nothing. The arms were also stuck. I was able to work them loose with a long screwdriver. Driver side worked fine, but I went ahead and replaced both. Everything works terrific now. Next stop... the radio.