1992 with tranny leak

not sure what seal to look at. fluid level leaks down to "x" point on the stick. don't see it falling out from the bottom. but it's not staying where it's supposed to. been this way for about 50k miles haven't had the time to look at it since it's still running. well. time to look before it does become worse. please, any advice would be helpfull.

It's probably leaking out the pan gasket. You should be looking for a 'wet' area on the tranny to be sure where it's at.