Can auto transmission fluid somehow leak into the oil pan?

I have a 91 Ford Ranger. Transmission fluid is getting into my engine oil. How is this possible and does anybody have any answere.Can auto transmission fluid somehow leak into the oil pan?
It cannot get into your motor oil, the tranny lines run thru the bottom of your radiator, why do you think trans fluid is in your engine oil ? If it is ? you would also have antifreeze in the oil as well !Can auto transmission fluid somehow leak into the oil pan?
it is just not possible. sure the trans level can drop but it does not end up in the oil pan. even a bad vacuum modulator would allow the engine to ingest the atf but put it in the combustion chamber to be burned, not dropped into the oil pan. sure the oil level may look over full but on so many of the ford engines since 1983, that stick was marked wrong, so even right after an oil change it reads over full on some and low on others.
The only scenario I could think of is this:





Your vacuum modulator which draws engine vacuum to determine when to shift has lost it's seal and is backfeeding through the tube in to the intake, when the engine is off the residual vacuum sucks tranny fluid into the intake and it is finding its way to the crackcase via bad valves/rings or a bad intake gasket......
there's no way this can happen at no point do these two fluids have a chance to cross each other,someone may have put it there but theres no way it can mix in to it,good luck.
UM this is not possible unless someone put it there by accident or someone hooked the wrong lines to the tranny and oil cooler