Yal - mine started with a high pinging noise that turned into a rumble between 25 and 45 MPH. However, when the rear wheels were off the ground, the bearings (at the wheel in the hub) seemed to be OK. This was also true with the engine running and letting the wheels spin - there was still no noise. As I mentioned before, there is no better way to isolate it than to put a mic back there in various locations and drive it, listening to the noises amplified in a head set. When I finally found the bad bearing the race was burnt and scored only slightly but it made a hell of a noise. No matter what, don't start throwing parts at it. My experience cost me nearly $2000 before I was all done just to replace a $70 bearing. Craig

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90 300SL Pearl Gray
92 300CE Smoke Silver