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I am not exactly certain how gear oil 'flows' thru the tranny... but it does... I think by the motion of the gears causing a swirl effect (but totally not sure lol)... Either way, everything turning will cause the moving oil to seep out from that panel gasket or the front/rear tranny seals. Just like any other liquid, solid or gas; tranny fluid will follow the path of least resistance (leak) given the opportunity. The tranny has a breather tube, so I don't think it builds any pressure per se... however, oil expands and contracts as it heats & cools and the breather sort of maintains the status quo of air volume for lack of a better way to explain...
Another thing that may help is to use different color gear & motor oils... I use Royal Purple 75W90 in my tranny and a different color oil in my engine... If your bell housing is kept clean & maybe painted a nice color like silver; you can often tell which one is leaking by looking at the color of the drips forming at the base of the bellhousing flange.
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