Zip, I understand what your saying about where you think this thread is going. It sounds like everyone is having same problem with slight variations.
Everyone is going in different circles to find out what the heck is going on with these related vehicles that's all.
This is where I'm currently at with my fix:
I just got the suburban ltz back from the dealer(after two weeks there) the roof cross bow fix and I did not fix the problem. It did fix the roof bows not being attach to the roof though. One can only think how many are driving around out there like that alone and what (if there are any) safety concerns just because of the roof bows are not attached. And I did inspect the heck out of the vehicle before signing and the dealer did put it back to showroom quality.
It still hasn't fixed "that something" that was the root of this thread. but it was something.
This pressure noise is such a hard fix to pinpoint. One minute it seems it's running rough and the window is down feeling (No windows are actually down), next it seems it's the rear end or a UV joint and there a clunk. It's just doesn't sound smooth and peaceful.
And I did get in contact with a GM Senior Advisor and started my Case #