In 1931, GM introduced light-duty pickups for both GMC and Chevrolet targeted at private ownership. These pickup trucks were based on the Chevrolet Master. In 1940, GM introduced the dedicated light-truck platform, separate from passenger cars, which GM named the AK series. Ford North America continued to offer a pickup body style on the Ford Model 51, and the Ford Australian division produced the first Australian "ute" in 1932. In 1940, Ford offered a dedicated light-duty truck platform called the Ford F100, then upgraded the platform after World War II to the Ford F-Series in 1948.