I was drivin down the highway at 45mph and I heard a loud bang. I just thought it was just a rock so I continued home, which was only another mile. When I got home I noticed either transmission or oil leaking at a high rate out of the bottom. I have the tools to fix it myself so I would rather not take it to the garage if I don't have to. Any ideas in the problem. It is a standard so I couldn't really tell the difference between oil and transmission fluid.