I've had it with this 904, about to give up!

I personally don't remember what years interchange and Fishy68 does mostly 727's
If you do a google search you just might find it somewhere.

Just for safety you should flush your cooler lines and take a good look at the converter, and have it flushed also.
If the pump drive lugs are gone the metal went into the converter, and I wouldn't be surprised if the valve body and governor stuck from it either.

That sucks.
It might be best to find a later trans put your good parts in it.