The Task Force 1957 GMC 100 Half Ton. The 1957 GMC light duty trucks were second generation called “Task Force” models. These replaced the “Advance Design” trucks beginning in 1955. GMC “Task Force” generation trucks offered 12 volt electrical and the first V-8. Design changes for the 1957 model year helped give the GMC 100 a family car look while still being a tough worker of a pick up. The new ’57s featured a wraparound windshield, two-tone trim and clean lines that included a flatter hood than on previous year’s models. This Pickup has been upgraded with disk brakes in the front, and is completely original otherwise.