I have a 2017 5.3L 8 speed and was experiencing the same issue. The dealership flushed the transmission which has seemed to correct the problem. https://static.nhtsa.gov/odi/tsbs/2019/MC-10163890-9999.pdf Hope this helps.
**UPDATE** I removed the TC today as I had some serious electronic issues come up early last week. Monday while driving to work my truck went into "limp mode" as I wasn't able to drive faster that 10 mph. I had all types of lights warning in instrument cluster. I pulled over and shut the truck off and let it sit for a few, but no change. Thankfully I was close to work, so I parked it for the day. That same day I received 3 emails from OnStar Notifications, "Issue with Anti-Lock Braking System, Issue with StabiliTrak Stability Control System and Issue with Engine and Transmission, all recommend immediate service. When I left work, I started the truck and it ran like shit, it felt like it was missing cylinders. I went under the dash unplugged the TC, plugged it back in and everything went away with the exception of the engine light. I was able to drive it normally so when I got home I disconnected the battery and reprogrammed the TC. The engine light went off, but over the past couple of days, the truck didn't feel right. While driving and maintaining 60 mph, then engine would surge. It wasn't crazy I but could hear it (aftermarket exhaust) and watch the tach move about 1/8 of an inch. It was nice to have the added throttle response but the risk of this happening again, isn't worth it. So this will sit in my garage and collect dust. Hopefully this doesn't happen to anyone else, but if you get some crazy warnings, I'll bet it is the TC.
I received the Vitesse Throttle Contoler (TC) today. While I was down there I also braced the backing plate that the pedal is attached to. The bracing did help the remove the flex in the pedal, but the TC definitely reduced the throttle lag and has increased the responsiveness. As of now I have it is SP3 (Sport level 3). I would recommend this to the people that want change the way the accelerates.
I have the same sound and it is from the passenger side rear seat. I've looked at the seat bolts and seatbelt bolts. It does it when the seat is up and down, but it is louder when the seat is down. It's driving my fkin crazy. Once I have the time, I plan on having my wife drive while I'm in the back seat.
Sorry for the extremely late reply. I haven't been on here very much lately. The install was completed and I' very happy with the results. The Bilstein on the highest setting provided the perfect amount of lift. I do have very minor rubbing on the wheel liner. I'm sure I could fix it, but honestly to me isn't worth the time......yet.....hahaha.. I will say the ride is definitely much stiffer than the stock shocks and you do feel minor bumps in the road. The Continental tires are great! The ride, noise level and traction is awesome. I will be buying these again.
Just had the dealership install the Bilsteins on top setting and new Continental TerrainContact 275-60-20 tires. The price was amazing and really glad I have a good rapport with the Service Manager. The stance is perfect with just a slight rake and I now understand what others have said about the ride quality.. no regrets at all!! I don't have many miles on the tires but there was an immediate difference with traction on wet roads, handling and the road noise is no different the SRAs.
I should have everything installed around the first week of Oct. I will post my results afterwards.
Thank you for taking the time to reply. I do appreciate it. I'm going to bit the bullet and install the shock on the top setting.
So from what I'm reading, if I use the highest setting on the Bilteins the tires will rub.
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