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montecarlo104

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  1. montecarlo104
    Just purchased a 2024 GMC Sierra 1500 Ultimate Denali. At around 500 miles on the odometer, I starting to feel a shudder from the drive train. I initially thought it might be a lost a wheel weight/balance issue at first but when it starts to shudder while driving, I put the transmission in neutral and shuddering stops. Put the transmission back in Drive and shudder resumes. It reminds me of a similar issue with my 2017 Sierra 1500 Denali with the 8 speed that only required a tranny flush to fix. Let see what GMC does with this brand new truck transmission issue...
  2. montecarlo104
    Thank you for the info. They actually use TSB-18-NA-355 now. Put 300 miles on it since and not one shudder yet. Problem solved for now... TSB-18-NA-355.pdf
  3. montecarlo104
    My 2017 Sierra 1500 Denali 4WD started slightly shuttering only intermittently around 42,000 miles. Now at 47,500 it has become unbearable and I have to downshift into 7th gear. Going into dealer next Monday, we will see what they say.
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