It was introduced with the 2022 refresh of the Sierra’s T1 generation that first came out in 2019. The AT4X trim expanded AT4 as GMC’s off-road subbrand, enhancing the rugged aesthetics and ...

Model year 2022 saw both the Sierra and Silverado receive a refresh. As part of the facelift, GMC introduced the off-road AT4X grade and the luxury-oriented Denali Ultimate trim level. At the time ...