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Everyone I need help.  I have a 2010 RS LT2 Camaro.  I have taken my car to 2 diff dealerships now.  The only thing they have come up with is rocks in my rotors.  Occasionally when I am going 5-15mph my car makes a screechy noise coming from the back end.  It only makes the noise when my wheels are moving, I even tried putting it in park and revving my engine.  My brakes being pushed doesnt change anything either.  Most importantly though it is never consistently there.  I do drive over quite a bit of gravel/larger rocks(we had some mine subsidence in our neighborhood) so I am wondering if that is all it is.  Please help if you have had this problem, know anyone who has, or have any advice.  My wife recorded this video of my car making the noise going down my driveway.  Thanks!