My 55 tbird occasionally pukes trans oil out the dipstick. This falls on the hot exhaust manifold and really irritates anyone following me. It acts like pressure building up in the trans and has no place to go. The trans vent is as clean as a hound's tooth. This happens only after the trans is warmed up, and will happen every couple of miles until it runs out of fluid. This is an air cooled transmission. Any ideas short of heaving it into the woods?