Have someone sit on the passenger side to see if it can be heard from there. I had a rattle I swore was coming from the glove compartment. I sat as a passenger and the sound then sounded like it was coming from the lower console. Turned out to be a pair of sunglasses rattling in the overhead console glasses holder. Go figure.
My solution to the problem was to stop doing yard work. When I close any of the doors on my 2017 Silverado around 10 seconds afterward I get brief 1 second sigh. Squeaky sound like letting air out of a balloon when stretching the neck of the balloon. Sound comes from somewhere underneath the truck. I figured it was just some kind of reset.
Toyota 4Runners need to have the drive shaft slip joint lubed to prevent "loading/unloading" of the shaft when stopping at a traffic light. Don't know if GM drive shaft has that grease fitting on the drive shaft. Just a thought.
I had the same experience last summer on my 17 Chevy 2500HD Duramax Highcountry. In the old days if tires were slightly out of balance successive turns could cause the shimmy to come and go. Same is true today. It is hard to find sufficiently smooth roads in MT to experiment especially in winter. Mine has had 6 Michelins road forced balanced and still vibrates. It sits in my woodshop all winter hoping for a buy back or enhanced trade in. The notion that weight in the rear helps is one I agree with or at least added load reduces the sensation. Mine did not vibrate the few times I hit 70mph pulling a 4500lb camping trailer last summer. I usually keep it to 65 when towing.
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