Chrysler M platform

The M-Bodies were Chrysler Corporation's successor to the F-body Aspen/Volare. The platform, almost identical to the F-body, was introduced in 1977, and it was the basis for some mid-sized Chrysler models until its demise in 1989. The M-body was also the successor to the short-lived R-body, as the Chrysler New Yorker and Plymouth Gran Fury moved to it following the R-body's demise in 1981. The M platform was the final production passenger car with a solid rear axle mounted on Hotchkiss-style, parallel semi-elliptical leaf springs sold in the U.S.

Chrysler M Platform
Overview
ManufacturerChrysler Corporation
Production1977-1989
Body and chassis
ClassMid-size
LayoutFR layout
Body style(s)2-door coupe
4-door sedan
4-door station wagon
Powertrain
Engine(s)3.7 L Slant 6 I6
5.2 L LA V8
5.9 L LA V8
Transmission(s)4-speed A833 manual
3-speed A727 automatic
3-speed A904 automatic
3-speed A999 automatic
Dimensions
Wheelbase108.7 in (2,761 mm) (2-door models only, 1980-82)
112.7 in (2,863 mm)
Chronology
PredecessorF-body
R-body
SuccessorY-body

The M-cars were built at St. Louis, Missouri and Newark, Delaware with initial debut (LeBaron/Diplomat series) in spring 1977 as late 1977 models, with some 1977-83 production also at Windsor, Ontario. Beginning in late 1986 (1987 models) and through the last 1989 year (ending in December 1988), the American Motors plant in Kenosha, Wisconsin was also used for production.

By 1983-84, it became clear that most private buyers preferred the equally roomy but cheaper and more fuel-efficient K-cars; however, the M's long-proven traditional engineering, handling, and V8 engine availability appealed to police and taxi fleets, allowing the car's continued existence until the end of the decade. In 1989 the Chrysler M-bodies received a standard drivers side air bag. After the M-bodies were discontinued in 1989 Chrysler Corporation wouldn't build a rear wheel drive car outside of trucks and specialty models until LX based cars.

Vehicles on this platform include:

There were three body styles offered:

There were two wheelbases used:

  • 108.7 in - 1980-1981 2-door models
  • 112.7 in - 1977-1979 2-door models and 1977-1989 4-door models

Engines used with this platform include:

  • 225 Slant 6 (1977-1983)
  • 318 V8 (1977-1989)
  • 360 V8 (1977-1979)

References

See also
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