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2009 2500 HD 4x4 drivetrain loud hum when in 5th or 6th gear when slightly advan

- Chevrolet-2500 Pickup

Forum Post
06/13/09 08:41
Reuben R. Sizemore

2009 2500 HD 4x4 drivetrain loud hum when in 5th or 6th gear when slightly advan

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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This forum post has messages dated from 06/13/09 through 02/04/10, please be sure to read all the messages. If you feel it is old or outdated, please follow up with a question or comment and someone may be able to update it, or reply with newer information if you have it.

02/04/10 14:24

Try makeing sure the factory put enough gear lube in your differential. Had same issue and it was almost empty.
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    Chevrolet 2500 Pickup '2009 2500 HD 4x4 drivetrain loud hum when in 5th or 6th gear when slightly advan'