This full-sized pickup truck, and its Chevrolet Silverado twin, have been redesigned for 2007. It shares a platform with the Chevrolet Tahoe and GMC Yukon. The new Sierra retains the previous model's selectable, full-time, four-wheel-drive system and a generous load capacity. Electronic stability control is standard in the crew-cab model, but optional in the extended cab. The new truck has more responsive handling and a steadier ride. The interior has been significantly improved, with better fit and finish.