Escalade drone/hum/pressure question

There are basically two issues you are referencing: the "drone/vibrtation" issue and the "whine"....... the whine thing is actually normal for the new 8spd trans/transfer case combo in the lower gear levels.....it is not something "wrong" it is just the mechanics of the system in those lower gears.....at cruise and/or higher gears it's not there. Personally, I don't mind it ....but then I like the sounds of the engine, etc. ....gives me a sense of the power and ability of this truck! Now the "drone/vibration" thing, to the extent that some are experiencing it.....would NOT be pleasant! From my limited knowledge of physics...what appears to be happening is actually a "harmonic resonance" issue which will create not only a sound but a "feel" and/or sense of "pressure" particularly to the human ear. It can be caused by many different things....from an open window to any mechanical or structual vibration that causes a repetitive sound wave action. Apparently GM engineering is or has been working to locate the source......to what degree of success is not known.....but my vehicle was made in early December and I can detect that the resonance is "right on the edge" of happening, but never does....and, I wouldn't even know that it WAS an issue if I hadn't read about here in the forum..... The fact that mine does not get going into the "full blown" issue that some others have had would lead me to believe that they have taken some steps to modify or diminish the issue. I DO feel some very minor vibration.....but frankly, i believe that it is part of accepting 22in wheels and low profile tires. That very minor vibration changes to almost nil as I change road surfaces and the tires warm up. Just my thoughts.....

Thanks for the feedback guys! I do have to say that my HUM is not affected by road type. It is always present but becomes very noticeable at 70+ MPH. I can hear it "building" prior to 70 MPH but it becomes very noticeable at 70+ MPH. I have had 22" tires before on an Escalade and did not have this issue. I agree it is something with the new transmission/gears. The hum comes from the rear of the truck so I believe it the "whir" of the gears rubbing together and the faster I go and the faster the gears turn the louder the whir/hum/whine gets. I'm wondering will the gears 'break in' over time and this sound will diminish? I don't feel any vibration in the car.

As an aside I had a newer RR for about a year and it had a somewhat similar issue when the tires were inflated to high PSI. it would cause the aluminum frame to "hum" and was worse with 22" rims, fortunately I had 21" and when I reduced air pressure it mostly went away. Though I don't think thats what is happening in the Escalade.