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brian907

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  1. I have a 2015 Sierra Denali 4WD 6.2L 8-Speed. Someone had commented on the "pebble road" feel of vibration. That is what I'm experiencing and it is predominently at low speeds. At 55mph and up it seems to clean up, but I have a feeling after a few more miles - I only have 320, that I'll develop the 70mph ish vibe that most people have. At purchasing I told them about the vibration and they said 'flat spots on tires - these goodyears are crap and when they sit for long periods of time they develop flat spots. just drive it a couple hundred miles." Uh, no. This is a $58k with magical MAGNERIDE...it should ride at least better than my 2006 Sierra Denali I just traded in. So, they did road force balance and discover one tire was out of spec. I gave them the GM updates for the transmission relearn and TCC issued for the 8 speeds, which they also did. I drove it and it's a little better, but I think only due to the out of spec tire replaced and recent rebalance of the remaining tires. I drove other exact spec truck - they too had the vibration. again, it's riding down a perfectly smooth asphalt road but rides like its gravel. I even tried a 6.2L 8 speed without magneride - a little less pronounced but still there. The service manager and my sales manager were very helpful and understanding, I must say. They acknowledged the issue, and they put a pico gauge vibration monitor on it while driving but it "is within GM specs" therefore it's 'OK'. hmmm, well if it can be detected as vibration by a human body or shaking bottle of water then obviously your tolerances are set incorrectly...or maybe to the convenience of GM. Like I said, my dealership is being great at this point. what I don't understand are all the rave reviews about these trucks when they ride rougher than my '97 chevy truck. I will most likely pursue the rear differential ring teeth being out of spec as that is what I've read as being the only true cure for people. My lesson? never buy a new model year again. my last was a 2006 and they had all the bugs worked out by then. Not one problem in 91k miles.
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