11/14/2023 0 Comments School bus uniform 1970s![]() In 1974, the powertrain lineup was modified, as all GMC-built engines were dropped (alongside all diesel engines). In both Chevrolet and GMC school buses, the Allison AT475 3-speed automatic transmission became an option in 1971 with single or two-speed rear axles. The division offered its conventional school bus chassis with Chevrolet-produced engines, including the 250 inline-6 (replaced by the 292 inline-6), 366 V8, and 427 V8. As with the previous generation, the design was a rear-hinged "alligator"-design hood. In 1967, Chevrolet moved the medium-duty C/K to a dedicated chassis, taking the school bus chassis with it. After 16 years as a Chevrolet and 12 years of production as a GMC, the first-generation C/K bus chassis was retired after 1983. As Chevrolet and GMC had only adopted the C/K chassis together in 1971, GM would continue the production of the 1967-generation chassis for another decade. For 1971, both divisions consolidated conventional bus production solely to the C/K chassis.įor 1973, General Motors redesigned the entire C/K truck line, ranging from half-ton pickups to medium-duty trucks. Retired 1977–1983 Chevrolet school bus (Body: Thomas Built Buses) in use as a shuttle bus in North Carolinaįor 1966, GMC ended the use of a shared conventional bus chassis as it debuted its own version derived from its H-series heavy truck line Chevrolet debuted its own design in 1967, derived from the C/K medium-duty line. Consequently, the conventional-type school bus chassis used for both divisions were largely the same. With the exception of divisionally-produced engines, the Chevrolet and GMC medium-duty trucks were largely identical to one another. Although using a stronger frame and suspension, much of the bodywork was shared. Prior to 1966, all medium- and heavy-duty trucks of General Motors were derived heavily from the C/K series trucks (and the Task Force trucks before them). As of current production, General Motors provides bus chassis for both school bus and commercial bus applications, deriving all production from the light-duty GMT610 (Chevrolet Express/GMC Savana) cutaway van. Until its 2009 discontinuation, the medium-duty GMT560 chassis was used for bus applications (only in a cutaway configuration). ![]() While primarily used for school bus applications, General Motors offered the chassis for multiple commercial and specialty uses.įollowing 2003 production, the B-series was discontinued as GM concentrated on bus production derived from cutaway cabs. The B-series was constructed as a cowled-chassis design also known as an incomplete vehicle, all bodywork aft of the firewall was produced by a second-stage manufacturer. Initially derived from the medium-duty C/K series, later examples were derived from the GMT530 architecture. Produced across three generations from 1966 to 2003, the model line was a variant of medium-duty trucks marketed under the Chevrolet and GMC nameplates. The Chevrolet and GMC B series was a series of cowled chassis that were produced by General Motors. 1993 GMC B series (left) and 1984 Chevrolet B series (right)
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