I have 142K on car. Wife recently drove home and said car is making unusual noise. She was right. Here is best description. Sounds like low pitch rapid buzz or clicking. It does not happen if I stop car and rev engine so that appears to eliminate engine and accessories. Transmission fluid clean and just does not sound like tranny problem. The sound is audible but not overwhelming and also does not sound like it is coming from brakes. The rapidity increases with speed. Could this be the beginning of CVG joint problem? Any other suggestions would be appreciated.