2024 Gmc At4x Hd. Full grain leather alpine umber (h40) other changes include retiring redwood metallic (color code g48) from the list of 2025 gmc sierra hd exterior. It's the first time an at4x model is available on sierra hd trucks.

Full grain leather alpine umber (h40) other changes include retiring redwood metallic (color code g48) from the list of 2025 gmc sierra hd exterior. At4 and the first ever at4x.