I have a stupid question. I was checking the level of the transmission gear oil on my 95 SW and It poured gear oil all over the place. I have an r380 transmission. I used a torx ratchet to open it up. I assumed that since it was on the side rather high up it was not the drain. There is a large nut below that I thought was the drain plug. My first stupid question is could it have been filled to over capacity by the previous owner. Second question, if that was the drain plug. Where do I refill the gear oil? Any help would be great.