If the sound changed when turning, chances are you have a bad wheel bearing.
As far as the other test, you need to get under the vehicle and check for play where the drive shafts connect to the differential and transmission. If you try that, make sure the vehicle is in neutral, the park brake on securly, and block the wheels so the vehicle can't move. It needs to be in neutral so there is no tension on the drive shafts.
Let me know what you find. Also, when turning, if you tell me what direction turn made the noise go away, I'll tell you on what side the wheel bearing is bad.
Let me know.
Wednesday, February 17th, 2010 AT 9:49 AM