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Walkerman

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  • Name
    Steve Walker
  • Location
    Portland, OR
  • Drives
    2020 GMC 3500HD

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  1. Walkerman
    I have a 2020 GMC Sierra 3500HD that came stock with 18" wheels and 275/70/18 tires. I want to go to the Denali wheel/tire that is 275/65/20. Question is can the dealer reflash the ecm to reflect that change? the 275/65/20 is 1" larger in diameter. I would think that it's possible because the powertrain is the same.
  2. Walkerman
    I have a 2020 GMC Sierra 3500HD. Question is, why does the tailpipe taper down to 2.85" at the end? What is the benefit of that?
  3. Walkerman
    2020 GMC 3500HD. Yeah, mine sounds like that. 10k miles. Great video.

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