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It sounds like you have the right idea and I would put a screw there to stop the leak. Probably fell out a long time ago. Just try to get an exact match of threads and length so it's a permanent fix. Good Luck.

Thanks man I'm going to do that today.. is this a mechanic I'm talking to? Have you ever heard of that? A car having a hole beside the transmission cap for a screw that would leak out the transmission fluid if it's not in there? I really appreciate you answering me man I really need this fixed and I just don't have the money to take it to a mechanic right now. And I really don't know much at all about cars

I'm not familiar with the Cavalier but anytime a missing screw falls out and oil leaks, it's common sense to replace it. Yes, I'm a mechanic on heavy trucks and equipment, small engines and my own vehicles for 50 years. You will do okay fixing stuff, you seem to have a lot of common sense...that's the best tool. Good Luck

Thanks man you have been really helpful. I'm gonna go to a part store and see if they can give me a screw to match up to it. I have never worked on cars but I'm gonna try to put my own brake pads on next week cuz I barely have the money for the pads i can't pay a mechanic for labor. But like you said I'm gonna use my common sense and YouTube videos and hopefully ill get the pads on right. Thanks a lot buddy