Did you remove the fill plug before you started pouring it in the shifter hole? Sounds like you've overfilled it. You definitely need to lower the level -- or it will "self lower" which will be quite messy. Just put a pan underneath and remove the fill plug and let it drain until it stops coming out of the fill plug (not the drain plug - the fill plug sits a few inches above the drain plug on the same side - passenger). Then put the fill plug back in and clean off the side of the tranny with some brake cleaner. Leave the shifter off til you're happy it's at the right level - want to make it easy for air to enter the tranny while it's draining.