I'm looking to purchase a 06 with 83k from a friend of mine. It drives great except there is a grinding/vibration when i let off the gas. This is most noticeable at lower speeds but it does it at pretty much any speed. I can feel it in the pedal and in the steering wheel. I also smelled hot gear oil. Does anyone know what this could be? The local dealer is too busy with recalls to give me much time for an inspection.