Astro is a heavy-duty (Class 8) cabover truck that was manufactured by the GMC Truck and Coach Division of General Motors. The largest cabover trucks ever produced by GM, the Astro was introduced for 1969, replacing the 1960-1968 GMC "Crackerbox" COEs. The Astro would become the final truck of the type assembled and marketed by General Motors, following the 1981 exit of Chevrolet from heavy t...