that would use a GM B-series chassis during its production. 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. Powertrain details In line with its predecessor, the third-generation B-series was offered with a range of gasoline and diesel engines. The 7.0L V8 was discontinued, leaving the 6.0L V8 as the sole gasoline engine. As part of the 1997 GMT530 revision, the 6.0L V8 was replaced by the Vortec 7.4L V8; in 2001, an all-new 8.1L V8 (one of the largest gasoline engines ever used in a school bus) became the gasoline engine. As gasoline engines fell out of favor in large school buses during the 1990s, GM would become the final manufacturer to offer a full-size bus chassis with a gasoline-fuel engine, with the 8.1L V8 serving as the final example from 2003 to 2016. Alongside the standard gasoline V8, the GMT530 was offered with multiple diesel engine offerings as an option. Initially offered with the Caterpillar 3116 inline-6, the Caterpillar 3126 inline-6 became an option in 1997. The GMT530 chassis was offered with 5 or 6-speed manual transmissions, along with multiple Allison automatic transmissions. The model line was also offered with multiple options for alternative-fuel configurations. Alongside conversions of gasoline engines to use LPG (propane), the GMT530 was also offered with options to use CNG (compressed natural gas). Blue Bird CV200 Prior to 1992, the