727 doesn't want to move

I don't know the fluid capacity of a 727 according to the book, but I know when I rebuilt my 727 I put in a little under 9 quarts which includes what I added to the dry converter before assembly.

You said you dropped the pan and then put in 3 1/2 quarts. I think it's just low on fluid, that would explain why it's "surging" and getting hot too.