I believe the valve was redesigned and may not be as easy to keep open as it was with the older exhaust. I ended up with the same problem with the squeak again, and bought a Borla Atak exhuast system. I like how loud it is, but it probably pisses off the neighbours on cold start in the early morning.
I would check for ice/snow in the wheel/brake areas of your truck. My car is the worst offender for this. I found that if I had water freeze or snow stuck in the wheel/brake area I would basically be vibrating for my entire 70km highway commute. Typically I would take them to a car wash if it was above 0C or try to park in a heated garage for a few hours. That would usually fix my vibration.
I took my '17 Sierra in for the same thing today. After doing a bit of digging online, I referenced PIT5404D (Dated June 16, 2017) and the techs were able to reproduce the squeak and verify that PIT5404D was the correct bulletin. I'm in Canada, it will take a week or two to get whatever parts necessary to fix it.
When I bought my truck, my requirements were Standard Box, Leather. There were only 3 available in the dealer group. I lucked out and got the only CC Standard Box in the dealer group inventory at the time.
2017 5.3L 8 speed here. No issues with my 8 speed. I think it is more designed for towing anyway, as I always seem to be in the power band when I need to accelerate. The 2017 6.2L 8 speed is not as good in my opinion. I found it to be harsher in upshifting and a bit schizophrenic in stop and go traffic when I test drove it for a week. It was a completely different experience from what I experience in my 5.3L 8 speed.
5.3L CC Standard Bed checking in. My requirements for a truck were: Standard Bed, Leather, and not red in color. Here in Alberta that was hard to find at the time of purchase (early January). There were only 2 in the province the dealer group could find. I don't think I have seen a '16 or '17 denali CC Standard Bed yet either. I know they exist, but its almost a unicorn here.
Here is my "Executive Garbage Hauler" as my boss calls it.
I don't have tow mirrors, but the motors are pretty weak. I have noticed that one of my mirrors might not fold out/in if the mirror arm has some ice on it. Once it melts, it seems fine.
I think that TSB is only for 15 and 16 model years. I wasn't able to find anything matching for 17 model years. That being said, I did notice that the loaner 2017 6.2 8 speed I had for a short time had a defined kick when downshifting to gear 1. My new 2017 5.3 8 speed is smooth like butter.....although I only have 900 miles on it, time will tell.
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