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AGARubberDuck

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    MN
  • Drives
    2016 Silverado LTZ Z71 6.2l

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  1. AGARubberDuck
    Well, my lawsuit has been finalized, truck returned, payment received and cleared. This chapter is over for me. I don't know WTF has gone wrong at GM, but it is definitely not the company it once was. I will not be buying another new GM truck.. ever. Further, I will be relaying my experience at each opportunity I get. I'll be checking back on this thread after the milestone number of pages, 800, 900, 1000+. Maybe one day they'll figure out it is some sort of aerodynamic problem or some other super-odd crap and make these pickups worth driving again. Good luck! - Duck out.
  2. AGARubberDuck
    I actually did this. Interestingly, the shop stated they typically accept a tolerance of 0.005" or less deflection at 2200rpm to be the number they aim for when balancing a driveshaft. Mine measured out to 0.0005". "dead on the nuts" was his exact words. No dents, out-of-roundness or defects of any kind. This problem has taken up so much room in my head for the past 10 months I'm thinking about all kinds of odd possibilities. Maybe it is actually an aerodynamic problem? Seems everything from the transmission back through the tires has been ruled 'in spec' or better. Heck, I even received new shocks as they had 2" of dead travel, suspecting they were introducing the problem. (obviously they were worn out after only 9k miles of dampening a horrible shake) But if this truck is indeed super light and ridged, maybe as you drive at highway speeds, typically in the 70+mph range, there is enough downforce to start oscillating the onto the suspension. I can drive on the same stretch of road day after day, some days it's shaking so hard I'd feel nauseous. Other days it is smooth as glass. Most days are in the realm of "this COULD be the road" but I know better. Maybe this is at least partly explained by wind speed and direction. Who knows.. not my problem any longer Now I just need to forget about it this unsolvable problem.
  3. AGARubberDuck
    yes. Check the criteria for your state. It will need to have been in for repair for the same problem a certain number of times OR out of service for a certain number of days. Just be prepared for the process to take a very long time; I was driving loaners for 90 days out of the first 5 months before talking to my attorney. The suit took 4 months and could have taken longer if GM decided to go to court instead of settle.
  4. AGARubberDuck
    I disagree. I think the way GM can ignore the un-fixable vibration is aided by every possible shimmy, shake and vibration being lumped into one bunch. So far as I've read there are at least 3 distinct problem vibrations with this platform beyond the issues that can affect every make (like unbalanced tires, bent driveshafts, etc.. 1. roof panels of the SUVs were flexing at a rate owners were calling it a vibration, coupled with a thunderous noise inside the cabin as if a sunroof is open too far. - fixed by somehow attaching the roof panels to the chassis better? 2. Vibration due to dropping from 8cyl to 4cyl. - Seems to me this is fixed by a flash, didn't read too much into it since this isn't my problem. 3. The actual, un-fixable, un-explainable, and inconsistent shaking that can happen in the 62-68mph range, but more commonly in the 72-80mph range. I had number 3. Had, being the operative word because I have a rockstar attorney that successfully sued under lemon law. I'm done with GM for now, but will keep checking back to see if they ever get this sorted out. If it didn't drive me mad on long trips I could have really loved my 16 CC ltz-z71. It had a very nice interior, superior electronics package, and the 6.2l coupled with the 8spd transmission had me consistently achieving 25-27mpg on the highway. By the way, has anyone been able to get their service department to give them a readout of the pico scan? And beyond that, document the numbers vs. whatever 'Spec' is? Too many people I know are being told 'it is performing within spec' and when pressed, the dealership will not give numbers.
  5. AGARubberDuck
    Yes. Take it in and keep your paperwork. Shouldn't cost you a dime.
  6. AGARubberDuck
    Best direction for a quick solution? Not a lawyer and pursue lemon law, that's for sure. However, if you have the prerequisites for a lemon law case in your state (number of visits for the same problem, # of days out of service, or both..) AND you can live with the truck for several more months, it is the best way to make you whole again. I have a slam-dunk case but that doesn't stop the process from taking forever. Currently more than 2 months since filing suit. Your quickest way out is to trade it before it loses more value to depreciation and shop around for a deal, but you'll have to bend over for that option.
  7. AGARubberDuck
    Skip the idea for now. I drove 7 (Seven!) different 2017 models between service loaners and new potential replacements. Each one shook in it's own special way (albeit to a lesser degree than my own). GM has a law suit coming its way from my attorney. Really a let down as I am not interested in the other Makes.
  8. AGARubberDuck
    Mine is back at the dealership today. They put me into a 17 lt z71. Guess what, it shakes too (though substantially less than mine.)
  9. AGARubberDuck
    The thought of concussion did not occur to me, mostly because I grew up with motion sickness myself and a stop at fast food preceding the event has me thinking it was a simple upset stomach triggered by an hour of shaking. I should put it into perspective.. it wasn't SO violent I felt the need to immediately get off the highway (or even choose to drive under 60 on the freeway) but bad enough that I wouldn't want a full cup of coffee in there.
  10. AGARubberDuck
    Small update on my 16 LTZ-Z71 Crew-Short 6.2l, 20" goodyear tires. Vibrations most pronounced in the 70-80mph range. Significantly worse on new, smooth concrete. Violent enough for my kid to become sick in the back seat. 1st visit late Oct. - Tires balanced within spec but was out-of-round upon visual inspection. Dealer replaced 1 tire. Vibrations remain. 2nd visit mid Nov. - Dealer finds 3 remaining tires out of spec for balance, recommends replacement though goodyear tires are on backorder for 3-6 weeks. Obviously issue unresolved. 3rd visit mid Dec. - 3 tires replaced and service notes state the vehicle was road tested and found to be good. Literally 10 miles from the dealership the pickup is bouncing down the highway, this time in the 65mph range. A short jump up to 75 reveals the vibration is still there. We're supposed to be using this vehicle to travel to my old stomping grounds for Christmas and absolutely do not want to bounce the whole way there and back again. The dealer Service Advisor has an appointment set up for Thursday to get it back in, and will be supplying a service loaner. The SA is great, never once trying to dodge the issue and even though their tech says 'it's all good' on paper, continuing to treat it as a valid issue that needs to be resolved. I like the truck quite a lot and the best outcome is for the issue to be resolved (or minimized enough to be a non-issue), but at what point do I start aiming for a buy-back or pursuing Lemon Law options? I do have some concerns about the long-term effects of that much shaking on everything else on the truck.
  11. AGARubberDuck
    I guess I haven't looked very close yet. I'll see it again Monday. They're some form of Goodyear all-season, 20" wheel.
  12. AGARubberDuck
    Quick update on mine; service advisor called to tell me they are replacing the remaining 3 tires due to being out of tolerance. Road force measured more than 30lbs each. Other than the fact I'm a little miffed they apparently didn't bother to check them last time I had it in(where they replaced one tire) they tell me there is a national back order on these tires out 30-45 days. I'm not at all convinced more of the same is going to make a difference, but I guess I gotta play the game. "Take it home and deal with it until we can try this thing that likely won't fix it" makes for a pretty poor customer experience. Serious buyers remorse going on here.
  13. AGARubberDuck
    Good suggestion. When we came across what looked like a fantastic deal, I was trying to figure in my head why someone would trade a truck like this after only a few months and 9k miles. I decided it must have been grandpa's new truck and he could no longer drive, or perhaps a repo. I guess I have a pretty good idea now, but a history report is a great idea. This truck is replacing the duties of my crappy (but trusty) old '93 sierra for utility, and the Cayenne for family trips & DD. In my mind, these symptoms do not fit a tire/wheel out of balance issue. I've had that. A wheel out of balance doesn't come and go depending on road surface, nor does it change in intensity like this. It is most similar to when my Porsche had the driveshaft center support bearing bushing torn/beginning stages of failing. Match-mounting and road-force balancing tires/wheels minimized the effect on that car too but replacing the center support bearing was the magic bullet. Please do share your results. I'll do the same, but it'll be early December before I'll have the need to be driving out of town again. Off topic, but it is an 04 with 180k miles. It has had EVERY documented issue known to the rennlist and renntech forums (several more than once.) I've been fixing them all as they happen, but decided I'm in a position to enjoy a new truck that won't need to visit the shop all the time. Ha!
  14. AGARubberDuck
    Hi everyone. I joined to add my truck to the list exhibiting the Chevy Shake I picked up this 2016 Silverado, LTZ Z71 with the 6.2l. Beautiful truck, inside and out, but dang does it vibrate on the interstate! I bought it CPO October 25th with 9200miles on the odometer. After the first trip out of town I couldn't believe how bad the ride was. I felt really bad for my kid in the back seat being shaken up for 3 hours each way. So I brought it to the dealer and they told me even though the tires road force balanced to less than 12lbs each, one of the tires actually looked out-of-round and they replaced it. The new tire road force balanced to less than 4lbs. Fast forward two weeks and I'm back on the highway, bouncing *almost* all the way up north. I have video that I've shown the service advisor and he seemed to admit some of these trucks exhibit this problem. They're getting it back tonight before I fly out for the remainder of the week. I'm hopeful (but also doubtful) that the issue will be resolved this visit. General description of the symptoms on my truck: Minor and inconsistent vibrations from about 45mph - 65mph. Sometimes it is noticeable, other times I can pretty much convince myself it is road conditions. Major vibrations 70mph+ to about 82mph. Oddly the vibration is worse BY FAR on smooth, new concrete. Old patches of road with expansion joints/defects/etc seem to tame the vibration considerably, though I can of course still feel the road problems. I'm coming out of a Porsche Cayenne Turbo due to it's frequent need for dealer visits. Man would this be ironic if the Silverado has to keep visiting the dealer too. Anyhow, I'm glad this thread exists at least for my own sanity. Can't make this stuff up.
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