GMC Sierra 1500 Classic is a full-size pickup truck that was manufactured between 1999 and 2007. It was a facelift of the second-generation GMC Sierra that improved its styling and performance. The Classic featured improved engine power and a redesigned interior, as well as a new four-wheel-drive system, an improved suspension, and styling updates. The Classic also came with a variety of optional packages and accessories for convenience, luxury, and performance.