Bigblue87

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 between the BDS rear shocks or upgraded fox 2.0. Any feedback would be greatly appreciated. Thank you.

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 know these trucks come with higher gears (3.23) but a 10 speed tranny. Curious how the stock gears and tranny handle the larger tires or if you guys re-geared the truck? Look forward to hearing back from you guys and getting some information.

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 know these trucks come with higher gears (3.23) but a 10 speed tranny. Curious how the stock gears and tranny handle the larger tires or if you guys re-geared the truck? Look forward to hearing back from you guys and getting some information.