I have new 2009 Silverado 4x4 2500 HD, hydramatic 6th speed tranny, and ever since new it has had a drivetrain loud hum (harmonics) when advancing the throttle from 45 mph-65 mph.Now, It's getting worse. I can feel vibration tickle my feet.Has anyone experienced this? Seeking some info before taking it to dealer.Gives me a headache when driving.Any advice would be greatly appreciated. I am an ACFT Technician, seeking expertise from auto Tech. Thank you very much Reuben R. Sizemore
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