This GMC K Series is a 1980’s and 1990’s icon. This example has a special secret hiding under the hood, a 5.9L cummins diesel. With four wheel drive and a 5 speed manual transmission, this classic truck has all the components for a perfect rig. What do you think? Would you rather spend big bucks for a new truck with a warranty or would you prefer a classic truck with new components and a refreshed heart? We go in-depth with this diesel powered monster to find out what makes a classic truck so special and desirable.