[Too Many Projects]

I'm fairly certain the drain plug was added later. I'm not aware of any 1325 cases with that from the factory and the fact that it doesn't seat near as deep as the fill plug and with liberal amounts of blue rtv indicate a later addition. Someone has been in this trans but 3rd and fourth look a little rough for wear. No rings on the 10 spline input, quite certain it's an M20.