I later figured out that my passenger side motor mount was broken and anytime under a load it would roar and then quiet down once it shifts to high gear. The motor mount was the culprit!
So I have a 2008 Denali and when the HVAC power button is on it roars when accelerating until it hits high gear and goes away. This only happens when HVAC button is on, if it's off it accelerates with no noise at all. Need all the help I can get.
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