ncmtns

Update: 2/2 - Got call from dealership that the exhaust has been replaced and the technician said 99.9% of the buffering was gone. Went to pickup the Suburban, drove it home. Not only is the booming/buffering still there now the whole exhaust rattles!!! Unreal. So now I have to go back to the dealership and fix the main issue - the booming/buffering noise - but also have to find out why the exhaust now rattles. 2/3 - Got call late today - exhaust rattle fixed. Engine motor mounts were replaced but did not help. They are now going to add foam insulation into roof and look at roof bows. Say should be done by tomorrow or early Monday. Chevrolet said they would not pay for road force balance so I went ahead and paid to have that done. Results came back that all 4 rims were in spec. Tech said he will show the before and after results to me when I pickup vehicle. So at this point the exhaust has been replaced, the motor mounts replaced and tires road force balanced. I'm following what I have to here with what Chevrolet is telling me but not sure what would be left to do if roof work does not fix issue.... One thing dealership told me is that the exhaust is different in design. Does anyone know what changed from '16 model to '17?

Well I am officially part of this buffeting/pressure issue. Purchased a new 2016 Suburban LTZ 4WD with 22" rims. Starting getting the issue this week. Vehicle has 5822 miles on it. Took car to Chevrolet service shop. They called me today and confirmed the issue. They told me the first step Chevrolet told them to do was replace the exhaust. Parts are not available until next week. If that does not resolve it they would work on the roof. I cannot believe this. $70k vehicle. I have tried to read all posts on this. Crazy. What is interesting on mine is when you roll 4 windows down the pressure/buffeting is gone. But sealed up it is there. Also most prevalent around 40-45 and then again around 65-70mph. Interesting, a lower speeds sounds like a booming sound and at higher speeds more like a helicopter. Any suggestions on how to document/properly handle would be appreciated. I will keep everyone posted on progress. Off to drink a beer or two....