Richard F

Hello, I’m not a engineer and I don’t know how/why this shimmy is there but personally, I think you all are overthinking the driveshafts, tires, and whatever else you all have mentioned. I sole heartedly believe it has something to do with the AFM system. Period. Mine only does it sometimes on the same exact roads at the same(cruise controlled) speeds. I can notice the tach bouncing and I can feel the truck reacting to that. That is usually when it starts shaking. When the afm isn’t acting up and causing this bounce in the tach, the truck doesn’t shake at all! Period! Rides as smooth as you would ever expect anything to ride. I’m saving up to buy a programmer to disable that pile of $hit AFM SYSTEM AS SOON AS I CAN! Maybe there are a few different shakes that occur with these?? Mine may not shake for 6 months and then all of the sudden, BOOM. Shaker Engaged! Then 8 hours later, no more shake. I would think if it was mechanical, out of balance, it could not possibly come and go. That is not how I see mechanical issues working. If a tolerance is out on something it doesn’t miraculously fix itself. Or I don’t see how that’s possible. Again, no mechanical engineer here. So sorry if this is a incorrect statement. Mine shakes more severe some times and barely others. Hard shakes rattle my keys hanging from my ignition. And like I said, you can clearly see the tach bouncing… sometimes up to 400 rpm’s. If I get this thing tuned and it stops, I’ll try to remember to come back and let you know. I could be wasting my time, but at least in the end I’ll have that shitty AFM disabled! Dumbest thing ever for an engineer to come up with. In my opinion. have a great day! And shake on! p.s. GM should be ashamed to allow such a deal to continue and expect their customers to figure this out on our own dime. Obviously they don’t care for their customers and time will tell how many they will lose over issues such as this! 2017 Silverado. 5.3L. Z71 LTZ CREW CAB. Short box I’ve also had issues with leaking windshield(from factory). Braking issues that was never fixed by the dealer with the recall, although they put it in the system as the recall being done. Now the brakes still go in operable at low speeds and they expect me to pay since the recall was “Done” and it has to “be something else”. Notably, the truck does have a “prior salvaged” title (from cosmetic/body damage, absolutely no mechanical items were ever touched other than tires removed to complete repairs!). So that’s their out and to me, it’s ridiculous. Scraping some paint off fenders and a hood doesn’t damage the internals of the vehicle. I love the truck, but GM has some serious customer service issues to resolve in order for me to buy another one.