text: 1974 The full-size C-body 1974 Dodge Monaco was completely redesigned for the 1974 model year with an all-new unibody platform and sheet metal. However, the 1973 oil crisis began within days of their introduction. Chrysler was excoriated in the media for bringing out huge new cars, and sales suffered accordingly. Many in the automotive press also criticized the car's new design as being too derivative of what they thought resembled a 3-year-old Buick or Oldsmobile full-size car. The Dodge Polara and Polara Custom models were discontinued after the 1973 model year. The Monaco and Monaco Custom replaced them respectively. The previous Monaco was renamed Monaco Brougham. The Brougham name was used on a luxury option package from 1969 to 1973. Fixed headlamps on all Monacos replaced the hidden headlamps of the previous models. The standard engine on all Monacos was a  with a 2-barrel carburetor—engine options included a  with a 4-barrel carburetor, a  with a 2- or 4-barrel carburetor, and a  with a 4-barrel carburetor.
  1975
  For the 1975 model year, changes to the base Monaco were minimal. However, the Monaco Custom was renamed the Royal Monaco, and the Monaco Brougham became the Royal Monaco Brougham. These newly named models featured hidden headlamps. 1975 was the last model year in which the four-door hardtop was available. Some models, depending on equipment and the state they were sold in, received catalytic converters to comply with increasingly strict vehicle emissions control regulations. After the start of the 1975 model year, a limited-production option for Royal Monaco Brougham coupes was introduced: the Diplomat package featured a landau vinyl roof with opera windows and a wide steel roof band. It was available in only three colors—Cold Metallic, Silver Cloud Metallic, and Maroon Metallic. The standard Monaco and Royal Monaco engine was a  with a 2-barrel carburetor. At the same time, Royal Monaco Broughams and wagons received a  with a 4-barrel carburetor. Engine options for the Monaco and the Royal Monaco were a  with a 2- or 4-barrel carburetor, and all Monacos could be upgraded to a  with a 4-barrel carburetor. The car weighed over two tons with a top speed of 127 mph.