1964 Dodge Dart 904 transmission stopped working

Ok to answer a few questions from your guys comments,

-No gears at all

- fluid level perfect on warmup in neutral

- i did also have a leaking gasket on parking cable but i made sure to always check levels before driving

- the tranny has been rebuild once so it makes me think the clutch plates should be fine as it ran maybe 15k miles since the rebuild

Also what is this lip seal your talking about?