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2024 At4x. Gmc is building on the at4 legacy with the first ever sierra hd. The 2024 gmc sierra 2500 hd at4x aev edition adds functional style from american expedition vehicles trove of aftermarket accessories in a production package. Gmc is building on the at4 legacy with the first ever sierra hd. Here’s everything you need to know about the gmc sierra 1500 at4x.