For 1977 and 1978, Dodge shifted the Monaco to the intermediate Chrysler B platform, effectively downsizing the model line.

After a 12-year hiatus, the full-size Monaco was revived for the 1990 model year as the flagship Dodge sedan, replacing the Diplomat.

The Monaco received special badging, different taillight and grille treatment, and a sportier interior with a full-length center console, as well as a 383 cu in (6.28 L) 325 hp (242 kW) V8 engine as standard equipment.

[citation needed] The 1967 model year full-sized Dodges, the Monaco included, received significant facelifts with all-new exterior sheet metal.

[citation needed] Chief designer Elwood Engel's work featured generally flat body planes with sharp-edged accent lines.

The hardtop coupes featured new semi-fastback rooflines with reverse-slanted trailing edges on the rear quarter windows.

[citation needed] All full-sized Dodge cars, including the Monaco, adopted Chrysler Corporation's new "fuselage" styling, in which the upper and lower body are melded into a uniformly curved unit.

The look starts in the front of the car, with a nearly straight-across bumper—demanded by a Chrysler executive after a Congressional committee attacked him over the seeming inability of car bumpers to protect vehicles from extensive damage in low-speed collisions[citation needed]—and a five-segment egg-crate grille that surrounds the headlamps.

[citation needed] By the summer of 1969, the division released new chrome trim for the front fender caps and leading edge of the hood as an option, which gives the appearance of a then-fashionable loop bumper without the tooling expense.

[citation needed] At the rear, Dodge's signature delta-shaped taillamps were presented in a new form that required the top of the bumper to slope downward toward each end.

Called "Super-Lite" and mounted in the driver's side of the grille, this auxiliary headlamp was produced in a joint venture between Chrysler Corporation and Sylvania.

Monaco wagons received wood-grained vinyl trim along their sides and across the dual-action (side- and bottom-hinged) tailgate.

The designers chose to emphasize the length of the hood this year, which meant that the redesigned front end grew by three inches.

[citation needed] Improvements to the suspension were promoted as the new "Torsion-Quiet" system, which used strategically placed rubber isolators to reduce road noise and vibrations.

The car's sides lost their previous plump appearance in favor of a new, lean look with a new feature line that started on the front fenders and ran back through the doors, kicking up ahead of the rear wheels.

[citation needed] For its last year in the fuselage body, the Monaco continued with its 1972 styling, except for another new rear bumper with redesigned taillamps, along with a new decklid and rear-quarter endcaps.

Large black rubber guards were added to the bumpers to comply with new Federal five-mile-per-hour impact standards.

[citation needed] Inside, new fire-retardant materials in virtually every visible part of the interior meant added safety.

[7] The 383 cu in (6.3 L) V8 was rated at 290 hp (216 kW), and the fully equipped car featured power windows and a standard vinyl roof.

[7]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.

Some models, depending on equipment and the state they were sold in, received catalytic converters to comply with increasingly strict vehicle emissions control regulations.

[9] At the start of the 1976 model year, exterior changes on the full-size C-body 1976 Dodge Monaco were minimal.

Chrysler's new Lean Burn system was introduced to reduce exhaust emissions (only on the 400 cubic inch engine).

The 1977 model year brought changes to the Dodge Monaco lineup as a lingering result of the 1973–1974 energy crisis, especially as Chrysler decided to move the Dodge Monaco, in name form only, from the full-size C platform-body to the mid-size B platform-body line up for the 1977 model year.

Aside from the name change, the 1977 Dodge Monacos differed only slightly from the 1976 Coronet equivalents, receiving a revised front-end design with stacked rectangular headlamps.

Struggling to compete against the all-new designs of General Motors and Ford, sales of the St. Regis were heavily supported by fleets, primarily as law enforcement vehicles.

After 1981, the St. Regis was discontinued (in favor of the Diplomat), becoming the longest-wheelbase sedan, Chrysler had produced until the 2005 Dodge Magnum debuted.

Along with its ownership of the Jeep model line, the AMC Eagle sedan/station wagons, and the Renault lineup of the Alliance and Encore (and the newly introduced Medallion), AMC was sought after for ability to develop and engineer cars quicker (and at lower cost) than other American auto manufacturers.

The largest AMC-branded vehicle since the 1978 Matador, the Premier was to become a full model line, including a four-door sedan, station wagon, and two-door coupe (named the Allure).

[12] The Dodge Monaco was powered by the Renault-produced 3.0 L "Douvrin" PRV V6, paired with a ZF-produced 4-speed automatic transmission[12] For 1990, the Eagle Premier underwent a minor revision (leading to the deletion of the Design Giugiaro badges[12]).