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What Does AT4 Mean On GMC Trucks? Here's What The Package Includes
Available modes include Tour, Terrain, and Off-Road, with the various modes optimized for better fuel economy ... the HD AT4 -- has an MSRP that starts at $70,100. Both the 2500 and 3500 Sierra ...
Car and Driver23d
2025 GMC Sierra HD
Adaptive cruise control with trailering assist, previously standard on the 2024 AT4X and Denali Ultimate trim levels, now comes on the AT4 ... fuel-economy route. We've tested a Sierra 2500HD ...