gmc sierra humming underneath

Asked by westree1010 Dec 28, 2014 at 04:30 PM about the 2011 GMC Sierra 1500

Question type: Maintenance & Repair

I have a 2011 sierra 50,000 kms on it for the past couple of months started to notice a small hum underneath I do tow a 1000lb boat and a 2700lb trailer but not far. sometimes it hum when first started and put in reverse doesn't hum when idling also hums at 50 to 55 kms per hour when I let off the gas any help would be appreciated

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