2025 Gmc At4x Hd Specs. Tame the untamed in the first ever sierra hd at4x aev edition. For a more detailed look at the 2025 sierra.
Choose either a gmc sierra 2500 hd or 3500 hd and learn more about the vehicle specs, trims, and features available. 13.4 diagonal center touchscreen and 12.3 diagonal driver.