GM Authority has learned that this week is the last chance to order a 2025 GMC Sierra 1500 truck in Thunderstorm Gray (color code GNO) exterior paint before it is retired from the truck’s color ...

GM offers six 2025 GMC Terrain colors in all. Currently, only the entry-level Elevation trim is available. The third-gen off-road capable AT4 trim and premium Denali trim level will only rejoin ...