The third generation of the C/K series is a range of trucks that was manufactured by General Motors. Marketed under the Chevrolet and GMC brands from the 1973 to the 1991 model years, this generation is the longest-produced version of the C/K model line. Adopting the "Rounded Line" moniker by General Motors, the third-generation C/K is the second longest-produced generation of American pickup trucks (behind only the 1972–1993 Dodge D/W-series Ram pickup). From 1972 to 1991, the Rounded Line C/K trucks were produced in multiple facilities across the United States, Canada, and South America.