Dodge Diplomat

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Dodge Diplomat
ManufacturerChrysler Corporation
Also calledDodge Dart, Dodge Magnum (Mexico)
Dodge Coronet (Colombia)
Plymouth Caravelle (Canada; 1977–1981)
Production1977–December 1988
Model years1977–1989
AssemblySt. Louis, Missouri, United States
Kenosha, Wisconsin, United States
Newark, Delaware, United States
Windsor, Ontario, Canada
Bogotá, Colombia
Body and chassis
ClassMid-size car
Body style4-door wagon (1978–81)
4-door notchback sedan (1977–89)
2-door notchback coupe (1977–81)
LayoutFR layout
RelatedChrysler Fifth Avenue
Chrysler LeBaron
Dodge Aspen
Chrysler New Yorker
Chrysler Town & Country
Plymouth Gran Fury
Outside the US:
Dodge Coronet
Dodge Dart
Plymouth Caravelle
Dodge Magnum (Mexico)
Engine225 cu in (3.7 L) Slant 6 I6
318 cu in (5.2 L) LA V8
360 cu in (5.9 L) LA V8
Transmission4-speed A833 manual
3-speed A727 automatic
3-speed A904 automatic
3-speed A999 automatic
WheelbaseCoupe: 112.7 in (2,863 mm)
1977–1979, 108.7 in (2,761 mm)
1980–1981, Sedan & wagon: 112.7 in (2,863 mm)
1977–1989 (wagons through 1981 only)
LengthCoupe, 1977-1979: 204.1 in (5,184 mm)
1980-1981: 201.2 in (5,110 mm)
1977–83 Sedan: 206.1 in (5,235 mm)
1987–89 Sedan: 204.6 in (5,197 mm)
Wagon: 205.5 in (5,220 mm)
WidthCoupe & wagon: 74.2 in (1,885 mm)
1980–83 Sedan: 72.8 in (1,849 mm)
1987–89: 72.4 in (1,839 mm)
HeightCoupe: 53.4 in (1,356 mm)
Wagon: 55.5 in (1,410 mm)
Sedan: 55.1 in (1,400 mm)
PredecessorDodge Dart
SuccessorDodge Monaco

The Dodge Diplomat was an American mid-size car that was produced by Dodge from 1977 to 1989. It is essentially similar to the Plymouth Gran Fury in the U.S. market and the Plymouth Caravelle in Canada. It was also sold in Mexico between 1981 and 1982 as the Dodge Dart, and in Colombia as the Dodge Coronet. The Diplomat was initially offered in a coupe and a sedan. In 1978, station wagons were added as replacements for the departed full-sized C-body wagons.

The Diplomat was offered with a base 225 cu in (3.7 L) straight-six-cylinder engine, a 318 cu in (5.2 L) V8 engine, and an optional 360 cu in (5.9 L). The Diplomat, along with its Plymouth Gran Fury/Caravelle twin, were widely favored as police cars both in the US and Canada. Aside from the three-speed Torqueflite automatic transmission, a manual transmission was available until 1981 on six cylinder and 318 V8 models; 360 V8 models were automatic only as Chrysler lacked a manual gearbox equipped for that engine's higher torque.


The Diplomat name was originally used by Dodge on 2-door hardtop models from 1950 to 1954. It was also used on the export version of the DeSoto from 1946 through 1961. In 1975–77, the Diplomat name was also used on a trim package available on the Royal Monaco two-door hardtop.

1977–1979 Diplomat

Starting with the 1977 model year, the Diplomat became a full model line, rather than as the name of a particular body style. It was introduced as a late 1977 model in spring 1977 as a longer, fancier upmarket version of the F-body Aspen. The chassis and mechanical components are similar, and doors and various other body panels are interchangeable except for the front and rear header panels, bumpers, hood and trunk lid. Larger taillights extended into the rear hatch of the station wagon.

The 1980 model year brought new exterior sheet metal for the Diplomat, although wagons were unchanged, from the doors back. While the previous coupes used the same 112.7 inch wheelbase as the other models, the 1980 coupe used the 108 inch wheelbase of the Aspen coupe (though the square body was very different). The front end was more evolutionary than revolutionary, but in order to share a hood with the newly restyled Chrysler LeBaron the grille was narrowed considerably, with an unfortunate effect on appearance and sales. The roofline of the sedan was also made more square, marginally improving headroom, and conservative, Buick-like taillights appeared on all but the wagons. Manual transmissions were dropped. Following the demise of the Dodge St. Regis R-body in 1981, the Diplomat remained, becoming the largest sedan in the Dodge lineup, despite technically being a mid-size car. Dodge would not market another truly full-size car (at least based upon United States Environmental Protection Agency (EPA) passenger volume statistics) until the Monaco debuted as a 1990 model.

By 1981, Chrysler was switching to smaller front-wheel drive designs. However, its older and larger rear-wheel drive Dodge Diplomat (as well as the Chrysler LeBaron and Fifth Avenue) continued to sell. Chrysler's then executive vice president for manufacturing, Steve Sharf, met with officials at American Motors (AMC) to use the extra capacity at an assembly plant in Kenosha, Wisconsin to build the cars.[1] Chrysler's tooling was moved from St. Louis to Kenosha, and from 1987 until 1989 about 250,000 Chrysler and Dodge models were built by AMC at a lower cost than Chrysler could.[1] This relationship evolved into Chrysler's purchase of AMC in 1987.[1]

1981 Dodge Diplomat coupe

In 1982, the coupe and station wagon were discontinued and Canada's Plymouth version of the Diplomat came south of the border. The Plymouth Caravelle was offered in the United States as the Plymouth Gran Fury. 1983 was the last year for the Slant Six, and afterwards, the only available engine was the 318-cid V8 with a two-barrel carburetor. A four-barrel 318 remained the optional engine choice for the police package.

For 1984, the appearance of the upscale Special Edition or SE used the Fifth Avenue's front end with its parking lights located above the headlights, and a bright metal cross overlaid on the Chrysler grille's thin vertical bars. The SE had more exterior trim and an interior that placed the SE between the Diplomat Salon and the Chrysler Fifth Avenue.

As the 1980s progressed, fewer private customers purchased the Diplomat, and the M-body was eventually dropped during the 1989 model year. Although sales were strong, Chrysler CEO Lee Iaccoca held a low opinion of the M-body line as a relic of the pre-K car era and declined to invest any money in them. Despite lower gas prices in the mid- to late-1980s and a 2.26:1 rear-end gear ratio, the Diplomat's carbureted engine and lack of an overdrive gear on its TorqueFlite automatic transmission resulted in poor fuel economy compared with its larger competitors from Ford and General Motors, as evidenced by comparing the EPA estimates for 1986 models:

  • Dodge Diplomat (5.2 L V8, 3-speed automatic): 16 city, 21 highway, 18 combined
  • Chevrolet Caprice (5.0 L V8, 4-speed automatic with overdrive): 17 city, 25 highway, 20 combined
  • Ford LTD Crown Victoria (5.0 L V8, 4-speed automatic with overdrive): 18 city, 26 highway, 21 combined
1980 Dodge Diplomat station wagon, fR.jpg
1980 Station wagon

Late in the Diplomat's run, the car was subject to the federal "Gas Guzzler Tax."

Diplomats built from mid-1988 until the end of production were among the first Chrysler-built products to have a driver's side airbag as standard equipment, some two model years before the remainder of Chrysler's lineup (they were also among the only cars at the time to offer a tilt steering column with an airbag). Diplomats with airbags differed from earlier models in that they were also equipped with a padded, color-keyed knee blocker which extended out from beneath the instrument panel in front of the driver.

When the Diplomat and similar Plymouth Gran Fury were discontinued, it marked the last rear-wheel drive non-truck model (aside from the Dodge Viper) sold by the corporation until the Plymouth Prowler was introduced in 1997. The Diplomat's other rear-wheel drive sibling, the Chrysler Fifth Avenue, also ended production, but the nameplate was continued on a front-wheel drive chassis. In the Dodge lineup, the Monaco became the top-of-the-line sedan until the introduction of the LH platform.


  1. ^ a b c Smith, David C. (1 June 2008). "Oldest Auto Plant to Make Newest V-6". Ward's AutoWorld. Archived from the original on 6 April 2016.

External links[edit]

Dodge Diplomat at the Internet Movie Cars Database