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Bigblue87

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About Bigblue87

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  • Name
    MountainSierra
  • Drives
    2019 GMC Sierra AT4
  1. Could any of you that have an AT4 with the 6.2 and larger tires answer the below questions I have: -what type of gas mileage are you getting going 65/70 on the freeway? -did you notice a large power difference? With the higher gear ratio of 3.22, curious if you need re-gearing. I am hoping the 10 speed tranny really helps out here. I have a 2019 GMC AT4 with a 6.2 and looking at putting the 4” BDS lift kit on and running either 295/65/20 with 20x9 and 5” backspacing or 295/70/18 with 18x9 and 5” backspacing if they fit with new steering knuckle. Still debating betwe
  2. Dear AT4 owners, I just bought a used 2019 GMC Sierra AT4 half ton with the 6.2 liter motor and 10 speed tranny. I am looking at installing a 4” BDS lift kit designed for the AT4 which yields a total height of 6” lift when installed in factory 2”. I am trying to keep decent gas mileage and power, so looking at putting on 295/70/17 with 18x9 5” back space wheels or 295/65/20 with 20x9 5” back space wheels rather than a true 35x12.5 tire. Do any of you have a lifted AT4? I was curious what type of gas mileage you are getting and how the 6.2 liter handles the bigger tires? I k
  3. Dear AT4 owners, I just bought a used 2019 GMC Sierra AT4 half ton with the 6.2 liter motor and 10 speed tranny. I am looking at installing a 4” BDS lift kit designed for the AT4 which yields a total height of 6” lift when installed in factory 2”. I am trying to keep decent gas mileage and power, so looking at putting on 295/70/17 with 18x9 5” back space wheels or 295/65/20 with 20x9 5” back space wheels rather than a true 35x12.5 tire. Do any of you have a lifted AT4? I was curious what type of gas mileage you are getting and how the 6.2 liter handles the bigger tires? I k
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