Hey I need your guys' help. In my beater Mazda when I am in any gear 2nd and above, and am NOT on the gas, there is a loud rattling noise that seems to be coming from underneath where the shifter is. The rattling increases in speed with the car, the faster I go the faster it is. Anybody have an idea what this could be? My shifter support has been broken for a long time so the whole thing sits lower, but its never rattled before.

I am hoping its only something that is going to be annoying and not affect the car. So far haven't noticed anything different in the car.