After running at the track today, I noticed a whining noise that was never there before which I think is coming from the rear. The tone stays the same with RPM and it only happens when I press the gas. I can press it very lightly and It starts once I let off it stops. I just backed the car out of the garage and notice gear oil on the floor, I don't know if its from the vent, or something is blown. Could this be a wheel bearing? I'm going to jack the car up to take a look. What do you guys think.