2016ChevyShaker

Does anyone know what this whine might be? My 2016 5.3L with 55k miles just started making this noise. I can hear it when I am driving and gets louder the higher the RPM’s get. To me it sounds like it’s directly under the truck I can’t hear it in the engine bay. Possible transmission problem? https://youtu.be/zoNyEUSFNsw?si=5L6UKIIv0U2WSGna

First time poster, long time follower of this topic! I first got my 2016 Chevy Silverado in July 2016 and I didn’t really notice it until around 8000 miles. I now have 17,000 miles on it, have had my truck to the dealer about six times, and they give me the same runaround bullshit! They did a pico scope test, roadforce, and tell me it’s within GM specs. I tried the Hellwig Springs, no go on that either. I did see where someone changed out the rear end for a Yukon rear but I’m not going through all that hassle. heres mine: <sorry for portrait video.....its easier when driving>