Here's a question then - Does the sound change with vehicle speed or engine speed?
It didn't seem to, it sounded like a more constant grinding noise. But then again, when your car makes that kind of a sound, you tend to stop as soon as possible.
It hasn't happened since I posted this, but I haven't driven it a whole lot either. It seems to do it only after the car has been under hard driving conditions (heavy accelerating, uphill climbing, etc.) and I'm still curious why it was only doing it in Reverse initially.