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Whining noise on 2006 Chevrolet Avalanche 1500

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I have a whining noise whenever i rev my engine in nuetral or whenever i accelerate. Seems to go away aat high speeds but i think the whine just gets too high pitched to hear. 2006 chevy avalanche 5.3
(1) Answer
Did you find out what is was? My truck is doing the same thing..

Update: It was the alternator on my truck..