Just bought my '05 V and was driving it into work this morning and hit some heavy rain when all the sudden this loud noise from underneath car started happening. Almost like some sort of a vibration or grinding noise. I thought my transmission out. It was extremely loud. It stopped and when I got out of the heavy rain, but started again when I got into some more of the heavy stuff (then it quieted down once I got to dry area). Has anyone else experienced this or know what it is? Could it be the traction-control system?