[HSSS427]

When I pulled the filler plug to check the level, I had fluid start running out. So I guess it was a little high. I let it run and then sucked a couple of ounces out. Wiped everything down but do need to dry the floor and do the cardboard trick to check for leaks. I'm pretty sure it's coming from the top - either out that vent of the cover over the shifter rails is leaking.

Any "education" on why if it is over filled the fluid would be blowing out the vent on the top of the tranny? Does it get hot and boil up or is the level too high inside and the gears are throwing it up to the top?

Thanks!
Scott