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Whining Noise ext cab 2011 Silverado HELP!


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So i just got a 2011 Chevrolet Silverado. Im brand new to this forum but need answers. I have a whine particularly noticeable in first gear from a stop that is a constant pitch and gets louder with rpm. I went and had my tranny serviced, the place said the pan looked good no excessive material on the pan or anything. But i just cant seem to shake this noise. It does it every single time. Also my headlights flicker when i apply the brakes. Also a very faint hum is heard in overdrive very faint. You have to listen to it. Notice it between 45-55mph other than that i love the truck but these 3 things are bothering me bad cause it is the first chevy ive owned. Any help? Please.

 

5.3 L V8 w/afm 

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