In April 1970, GM introduced the third-generation G-series vans as 1971 model-year vehicles. In a complete redesign of the model line, the vans adopted a front-engine configuration (adding a hood to the body). While using a unibody chassis, the third-generation vans derived mechanical components from the second- and third-generation C/K pickup trucks.
In production for 25 years, the third-generation G-series vans became one of the longest-produced vehicle platforms designed by General Motors.