2024 Gmc Sierra 2500hd At4x Release Date. Gmc says the 2024 sierra hd at4x and at4x aev edition will be at dealers later this year, in the fall. Explore the latest specs, features, and trim levels,.
The first ever sierra hd at4x and at4x aev edition is taking the at4 experience to the next level. With gmc giving the 2024 sierra hd lineup a host of updates, including refreshed styling and a snazzier interior, the at4x and extreme aev edition reap the benefits.