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| Manufacturer | General Motors |
|---|---|
| Production | 1961-1996 |
| Successor | GM H platform (FWD) |
| Class | Full-size car |
| Layout | Rear Wheel Drive Live Axle |
| Engine(s) | V6, V8, I6 |
| Transmission(s) | THM400, THM375, THM375B, THM350, THM350B, THM200C, THM200-4R, THM700-R4, 4L60, 4L60E, M21, M22 |
The B platform, or B-body, was General Motors' full-size rear-wheel drive automobile platform. It was closely related to the C-body and D-body and was used for coupés, sedans, and station wagons.
As a body designation, the rear drive B-body production began in 1961, when General Motors restyled and redesigned all of its standard-sized and luxury cars - the first time in GM's history that such had been accomplished in the same year. From the late 1940s until 1960, GM used three different designations for various bodyshells/platforms including the A-body for Chevrolets and Pontiacs, B-body for Oldsmobile 88s and the smaller Buicks, and C-body for the Oldsmobile 98 and Full Size Buicks. For the 1961 model year, the previous A and B bodies became the new B Body that lasted until 1976. The A-body designation would be resurrected by GM in 1964 for a new series of intermediate-sized cars including the Chevrolet Chevelle, Pontiac Tempest, Oldsmobile Cutlass and Buick Skylark.
The GM B-body had at least 4 major re-engineering and restyling efforts, in 1965, 1971, 1977, and 1991; along with interim styling changes in 1969 and 1980 that included new sheetmetal and revised rooflines. The platform was downsized in length by approximately 10 inches in 1977 and reduced in weight by an average of 800 pounds. In 1991, the platform received its last major redesign, regaining several inches in length, numerous frame improvements and reinforcemnets, while the shorter wheelbase remained unchanged. The last B-cars rolled off the line in 1996, leaving only Ford producing domestic large rear wheel drive sedans, with Chrysler reentering the market with their LX platform in 2005.
All B-body cars used suspensions utilizing coil springs both front and rear, exceptions include the 1959-60 Oldsmobile 88 and 98, and the 1971-76 station wagons from all four GM divisions, both of which used coil springs in front and multi-leaf springs in the rear. All B-body cars since 1965 have used perimeter frames with side rails, along with the 1961-64 B-body Pontiacs and Oldsmobiles. The 1958-60 Buicks used a ladder-type frame while an X-frame without side rails was used on 1958-60 Pontiacs and 1959-60 Oldsmobiles, 1958-64 Chevrolets and 1961-64 Buicks.
The Rear Drive B-body was the last platform design to have the gasoline tank filler port behind the license plate. Exceptions included all station wagons, as well as all 1961-64 cars - which had the tank filler in the rear fender on the driver's side and 1965 Buicks which had their fuel filler door above the license plate.
By 1986, the Buick LeSabre and Oldsmobile Delta 88 moved to the GM H platform. No rear drive successor for this platform was made after 1996, when the Buick Roadmaster and Chevrolet Caprice ceased production.
Sedans built on the rear wheel drive B platform include:
- 1959-1985 Buick LeSabre
- 1959-1962 Buick Invicta
- 1991-1996 Buick Roadmaster
- 1962-1970 Buick Wildcat
- 1971-1973 Buick Centurion
- 1959-1972 Chevrolet Biscayne
- 1959-1975 Chevrolet Bel Air
- 1976-1979 Chevrolet Bel Air (sold only in Canada, as a rebadged Impala)
- 1965-1985 Chevrolet Impala
- 1965-1996 Chevrolet Caprice
- 1994-1996 Chevrolet Impala SS
- 1959-1985 Oldsmobile Delta 88
- 1967-1969 Oldsmobile Delmont 88
- 1958-1966 Oldsmobile Dynamic 88
- 1959-1981 Pontiac Bonneville
- 1966-1969 Pontiac Grande Parisienne (Canada only)
- 1959-1981 Pontiac Parisienne (Canada only)
- 1983-1986 Pontiac Parisienne
- 1959-1981 Pontiac Catalina
- 1959-1966 Pontiac Star Chief
- 1960-1961 Pontiac Ventura
- 1962-1981 Pontiac Laurentian (Canada only)
- 1959-1970 Pontiac Strato Chief (Canada only)
- 1967-1970 Pontiac Executive
- 1971-1975 Pontiac Grand Ville
Coupe-only offerings include:
- 1962 Buick Wildcat
- 1965-1969 Chevrolet Impala SS
- 1961-1966 Oldsmobile Starfire
- 1964-1965 Oldsmobile Jetstar I
- 1962-1968 Pontiac Grand Prix
- 1964-1967 Pontiac 2+2
- 1964-1965 Pontiac Parisienne Custom Sport (Canada only)
- 1966-1970 Pontiac Parisienne 2+2 (Canada only)
- 1971-1974 Chevrolet Impala Sport Coupe
- 1977-1978 Buick Riviera
Station wagons include:
- 1959-1963 Invicta Estate Wagon
- 1959-1964 LeSabre Estate Wagon
- 1970-1976 Buick Estate Wagon
- 1977-1979 Buick Estate Wagon (with LeSabre trim)
- 1977-1979 Buick Estate Limited (with Electra trim)
- 1980-1989 Buick Electra Estate Wagon
- 1980-1989 Buick LeSabre Estate Wagon
- 1990 Buick Estate Wagon
- 1991-1996 Buick Roadmaster Estate Wagon
- 1966-1968 Chevrolet Caprice Estate
- 1969-1972 Chevrolet Kingswood Estate
- 1973-1996 Chevrolet Caprice Estate
- 1962-1968 Chevrolet Impala
- 1969-1972 Chevrolet Kingswood
- 1973-1985 Chevrolet Impala
- 1962-1968 Chevrolet Bel Air
- 1969-1972 Chevrolet Townsman
- 1973-1975 Chevrolet Bel Air
- 1976-1979 Chevrolet Bel Air (sold only in Canada, as a rebadged Impala)
- 1962-1968 Chevrolet Biscayne
- 1969-1972 Chevrolet Brookwood
- 1959-1964 Oldsmobile Dynamic 88 Fiesta
- 1959-1963 Oldsmobile Super 88 Fiesta
- 1971-1992 Oldsmobile Custom Cruiser
- 1959-1981 Pontiac Bonneville Safari
- 1959-1981 Pontiac Parisienne Safari (Canada only)
- 1967-1969 Pontiac Grande Parisienne Safari (Canada only)
- 1983-1986 Pontiac Parisienne Safari
- 1959-1981 Pontiac Catalina Safari
- 1959-1981 Pontiac Laurentian Safari (Canada only)
- 1987-1989 Pontiac Safari
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