Back in the shop today for vibration (25-45mph) and buffeting/drone. This is the 4th attempt to fix the vibration and first attempt at the "buffeting".
Service advisor did show me a bulletin released on 2/7/17 advising the exhaust clamp can cause the drone/buffeting issue.
Placed in an Enclave.
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There is a fix for the drone/booming where they add exhaust dampers. There are many folks that had this done and posted pictures and "how to" on a different site. Most dealers don't know how to make the fix or are aware of it so you may need to take info in-hand with you and share with dealer.
However, the dampers do not fix the buffeting issue. Best bet for that will be to change out tires and make sure road force balancing numbers are under 15lbs.
I am like you regarding the truck...4 kids ages 12 to 2yrs old and want to keep our YukonXL, but constant headaches and sick feeling by some of us will force us to switch. It's definitely a love hate situation with ours currently. And with other things beginning to fail at 50k miles, the easy thing will be to get out from it, the problem is there are very alternatives.
