ok i was going to change my tranny fluid and i saw the drain hole but i wasnt sure if i had the right fill hole hole so i took a socket ratchet and stuck it in there and unscrewed it and a little bit of tranny fluid came out but it didnt look like i could get transmission fluid back in there with the funnel with a hose so i saw another screw that might be it and i took it out i think it took like a 18 mm socket maybe bigger but it wasnt holding anything together or anything just a big hole after i took it out i just want to make sure this is the right hole.... any help will be appreciated. Thanks