1964 Dodge Dart 904 transmission stopped working

He's described what happened perfectly, but he doesn't want to hear what it is. It went out a little at a time. It started slipping. He should have shut it down then and there but continued driving until it will not move at all. That spells fried forward clutches any way you slice it. Even if by some miracle it is a leaking lip seal, the transmission still has to come out and completely apart......but that's not what it is. The transmission is burned up.