2024 GMC Sierra AT4X: Diesel Standard, No EV

6.2-Liter Gas V8: No Longer Standard

The robust 2024 GMC Sierra AT4X boasts a bigger powertrain selection with the newly upgraded Duramax 3.0-liter inline-six turbodiesel engine. These vehicles will be available in dealerships throughout the summertime; however, pricing details have yet to be revealed.

The six-cylinder Duramax churns out 305 horsepower and 495 pound-feet of torque. The only transmission that comes with this engine in the AT4X is a 10-speed automatic. Motor1.com got in touch with GMC to make sure if the 420-hp 6.2-liter V8 would still be an option for this trim of the truck. “Yes. The 3.0L will be the standard engine, though, similar to AT4,” a spokesperson informed us.

“The introduction of the improved Duramax engine to the 2023 model year has been a success, with around 20 percent of all Sierra 1500s sold now featuring the engine,” said GMC Sierra Marketing Manager Will Mellon in a statement. “We anticipate that the addition of the AT4X trim will further drive up the engine’s popularity.” The inline-six Duramax engine is available on certain trims of the Chevrolet Silverado 1500 and GMC Sierra 1500.

Revised engine features included fitting of new pistons with a modified combustion cavity, an adjusted turbo compressor, up-to-date fuel injectors, as well as enhanced temperature regulation components. Formerly, the six-cylinder Duramax attained 277 hp and 460 lb-ft output.

For 2024, the Sierra 1500 is receiving a couple of minor refinements. Specifically, the Denali, Denali Ultimate, AT4, and AT4X models are being equipped with power-operated side steps. Additionally, the Denali, Denali Ultimate, AT4, AT4X, and SLT trims will offer an active exhaust system. In terms of styling, two new wheel designs and two extra colors – Downpour Metallic and Thunderstorm Gray – are also being added.

The newly-branded TurboMax 2.7L, turbocharged four-cylinder continues to generate a formidable 310 hp and 430 lb-ft, and is now able to be selected as an option on the Sierra 1500 Elevation, SLE, and Pro trims.

The Sierra 1500 AT4X trim was unveiled for the 2022 model year as a more robust version of the truck than its predecessor, the AT4. For added strength, the AT4X is equipped with Multilmatic DSSV shock absorbers. Plus, it has an extra 2.0 inches more in wheel travel at the front and 1.0 inch more at the rear. Underneath, it features a stronger skid plate shielding the transfer case. Furthermore, the truck comes fitted with 18-inch wheels along with 32-inch Goodyear Wrangler DuraTrac off-road Mud-Terrain tyres.

GMC is gearing up to electrify their Sierra model. The electric version is also set to come out in an AT4 option tailored for off-roading. The absolutely inaugural trim will be known as the Denali EV Edition 1, and it’s expected to become available during the early months of 2024.

If you prefer to delve further into matters concerning the AT4X, then test out [tune into] this episode of Motor1.com’s Test Car Happy Hour. The show will grant you insights into the brand propelled by an energetic discussion.

Motor1.com Test Car Happy Hour #30: F-150 Raptor R, Ram TRX, Sierra AT4X, Kia EV6 GT, & Kia Niro

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