I just change my wheel bearing two weeks ago. A couple of days ago I started to hear a grinding under the driver side when I hit bumps. It has gradually gotten worse. It sounds like a bad bearing but it's louder than the wheel bearing ever has been. When I jacked the wheel up it shifter about a half inch but I could not shake it at the 12 and 6 positions. Could it still be a wheel bearing? Any other ideas?