I now have 50k miles on my 2015 Tahoe LT 4WD with Goodyear tires and although I have several issues to complain about over previous generations of this vehicle, I've never experienced the vibration and/or buffeting problems...
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Just bought a 2017 Black/Black Yukon Denali right off the truck w/ only 5 miles. Of course I took it on a road test applying all the lessons learned from this forum & happy to find that my Yukon drive is smooth as silk.
I have the 2016 Tahoe LT with 21,000 miles and have experienced ZERO buffering. Now, i do get a vibration around 68-70mph and then around 78-80mph for some reason. Here is the crazy part, when we bought our Tahoe it had the 5 star pilshed wheels on it and had ZERO vibration at any speed, then switched to the Chrome GM wheels and now I have a vibration at said speeds. Our Uncle had the 15 Suburban and has same issues with the chrome wheels. He balanced and did several alignments and ever went through several brands of tires and never fixed it. He traded it on on the 16 Suburban with the polished 5 stars and ZERO vibration issues. We believe there must be an issue with the Chrome GM wheels.