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Compared to the previous pinnacle luxury model, the 2023 gmc sierra 2500hd denali, or even this year’s 2025 gmc sierra 2500hd denali, the denali ultimate brings gmc trucks to an entirely new level of luxury and. 2025 gmc 2500 sierra denali ultimate with the duramax and allison transmission @zoneoffroadproducts 5.