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In the middle of a "reving" episode, I switched to manual mode on the gear shifting - runs perfect. ...
When you switch to manual shift, do you put the transmission in the highest gear (L6)?
 

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Discussion Starter #23
So I took it back to the dealership and they kept it for a couple of days. This morning they called and said GM said it was the transmission valve body. I got it back this evening and it is still doing it.

Attached is a video without any other noise beside the road and engine. GMC_Rev - Google Drive

It is hard to hear anything on the video, but it is there and very frustrating.
 

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It almost has to be shifting gears, otherwise the vehicle should be surging. Unless you do feel surging. ..?
That's the reason I mentioned panning back in the video, so we can witness the vehicle reaction.
 

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So you can repeat easily now? If so, back in to the dealer, again. Feel for you...
 
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