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I hope you all can help with this one...my car vibrates (coming from the rear) at speeds over 40 while I'm making a gentle turn to the left. It's most noticeable driving on the highway when the highway curves to the left. The vibration is hard to describe, it's more like a humming noise that oscilates. If anybody has ever been on a plane and the two engines are slightly out of phase hum...hum...hum...hum...etc. that's the effect. Nothing when the car is straight or turning to the right. Bearing??? Diff??? Help
Well, ruling out that you feel the vibration at/ on the same road spot....
You'll have to jack the car up and shake the wheels and feel for a bearing.
Then look at all your a-arm bushings for damage.
Lastly, check for loose suspension bolts.