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Chevrolet/GMC B series The Chevrolet and GMC B series was a series of cowled chassis that were produced by General Motors. 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. Initially derived from the medium-duty C/K series, later examples were derived from the GMT530 architecture. 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. While primarily used for school bus applications, General Motors offered the chassis for multiple commercial and specialty uses. Following 2003 production, the B-series was discontinued as GM concentrated on bus production derived from cutaway cabs. Until its 2009 discontinuation, the medium-duty GMT560 chassis was used for bus applications (only in a cutaway configuration). 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. * First generation (1966–1983) For 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. For 1971, both divisions consolidated conventional bus production solely to the C/K chassis. For 1973, General Motors redesigned the entire C/K truck line, ranging from half-ton pickups to medium-duty trucks. 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. 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. * Second generation (1984–1991) While General Motors redesigned its entire light and medium-duty C/K truck line for 1973, Chevrolet and GMC retained the previous-generation cowled bus chassis for nearly another decade. For 1984, a second generation was introduced, consolidating conventional trucks and cowled bus chassis for the first time. Codenamed B6, the redesign was again shared by both Chevrolet and GMC, differing only in grille design. From the drivers' compartment, the B6 chassis shared the steering column with its predecessor (with nearly the same instrument panel). In a major design change, the rear-hinged hood was replaced by a standard front-hinged tilting hood, allowing improved engine access. The 6.0L (366) and 7.0L (427) V8 engines made their return, along with the 8.2L Detroit Diesel "Fuel Pincher" V8. In 1990, the 8.2L engine was discontinued. * Third generation (1993–2003) For 1990, General Motors introduced its GMT530 medium-duty truck platform under the Chevrolet Kodiak/GMC TopKick branding. The GMT530 chassis consolidated multiple product lines; along with the 1980-1989 Kodiak/TopKick, the model line replaced the medium-duty C/K (along with the heavy-duty GMC Brigadier). After producing the second-generation B-series chassis through 1991, GM skipped the 1992 model year entirely, with the first GMT530 bus chassis marked as 1993 production. While fitted with a lower hoodline than its predecessor, the chassis was fitted with a much larger grille; only divisional badging differentiated Chevrolet and GMC versions from each other. For 1997, GM rebranded the GMT530 trucks as the C5500-8500 series (dropping the external Kodiak/TopKick nameplates). The low-profile hood offered on medium-duty trucks was not offered on the B-series, retaining the higher-profile standard/severe-service hood. For 2003, the GMT530 platform was replaced by the GMT560 medium-duty architecture, ending production of the third-generation B-series by the end of 2003. For bus applications, the GMT560 chassis was developed for use as a cutaway-cab vehicle; while some were bodied as school buses, most examples saw use in commercial applications, competing against the Freightliner M2 and Ford F-650. Subscribe YouTube Channel :- https://youtube.com/channel/UCmPV_JB8cKIEhW4__IEas5A Like & follow Facebook :- https://www.facebook.com/bamipusmedia/ #malayalivlog #malayalam #youtuber #kochi #keralavlog #new #malayalam #youtubechannel #bamipusmedia #chevrolet #gmc #history

Added 6 Jul 2026