I have a four wheel drive 2018 Tahoe with the 6.2L. I often drive in "auto" and yes I know that is not recommended. Maybe my tires are shit but if I don't my ass end slides on left hand turns. Anyway I get a loud humming (whirling) noise when I am in "auto" or 4 wheel when I hit the gas. When I take my foot off the accelerator the sound stops. The car has 70k miles and has never made this noise before. I take it to the dealer and the guy just goes "well put it in 2 wheel - problem solved". I slide all over the place in 2 wheel and even the steering seems looser (if that's a word). I figured I would turn to the forums as you guys always seem to know about issues like this. Has anyone experienced anything like this before?