I tried to check my oil leval in my 1981 Hunter 30 2GM transmission today and couldn't figure out if it was correct or not. My trans has a bolt to remove that has the word oil written on it and what looks like it could be a dip stick on it. The problem is that the stick has no high or low marks on it. There is an indented line all the way around maybe 1/4" from the bottom and a hole through it almost at the top. Can someone tell me how to read this? I have checked all of my manuals and they do not tell me.