The D-series Dodge conventional pickups coped with federal mileage compliance by adding radial tires to the 100 series and restricting it to 225cid 6-cylinder engines.  And automatic transmissions weight lockup converters came in all trucks up to 6000 pound GVW.  The D100 and D200 series would be offered with an optional 243cid 100 hp Mitsubishi diesel 4-cylinder engine, … Continue reading 1979 Dodge D-Series Full-Size Truck Manufacturer Promo