GMC 1978 Manual Gasoline Peace, mercy, and blessings of God be upon you. I am offering you a 1978 GMC. The engine, gearbox, chassis, and differential are guaranteed. Isuzu 7-piston air conditioning. Truck bed wood. Four tires are a set. The vehicle has 40,000 miles and has been renewed. The license plate has 7 digits. Engine size is 350 original. Most parts are original. The vehicle is missing nothing.