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| caption = 1986 GMC C-3500 Sierra Classic 3+3
| manufacturer = General Motors
| aka =
| production = 1959–2002 (United States)<br />1959–2000 (Canada)<br />1965–2002 (Mexico)<br />1964–2001 (Brazil)<br />1975–1982 (Chile)<br /> 1960–1991 (Argentina)
| class = [[Pickup truck|Full-size truck]]<br>[[Medium-duty truck]]
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| caption = 1985 GMC K-1500 Sierra Classic
}}{{Main|Chevrolet C/K (third generation)}}
The third-generation C/K was introduced for the 1973 model year. Designated the "Rounded Line" generation by General Motors, the C/K grew in size inside and out. As pickup trucks increased in use as personal vehicles, cab features and options moved closer in line with GM [[Sedan (automobile)|sedans]] (with power windows and power door locks becoming options). To further expand its practicality, a four-door crew cab body was introduced (offering 6-passenger seating).
While relatively straight-lined and boxy in appearance (leading to their "square-body" nickname from the public<ref name="ReferenceB2">Brownell, Tom "Rounded-Line Models, 1973–1987" ''Chevrolet Pickup Color History'' (Truck Color History) Chapter 9, pp. 88–89 1994-08-07 Retrieved 2011-01-15</ref>) the Rounded Line trucks were the first generation of the C/K to be designed with the use of computers and wind tunnels, optimizing the exterior shape for lower drag and improved fuel economy. The chassis was an all-new design (with all trucks receiving a leaf-spring rear suspension); K-Series trucks moved to all-wheel drive (shift-on-the-fly 4×4 was introduced for 1981).
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In a branding change, the C/K nomenclature became exclusive to Chevrolet, as all GMC pickups became Sierras (GMC retained the C/K nomenclature for its internal model codes). Chevrolet introduced several specialized variants of the C/K series, including the work-oriented W/T 1500, off-road Z71, and the high-performance 454SS. Between one-ton trucks and the Kodiak medium-duty trucks, Chevrolet and GMC offered the C3500HD chassis cab for commercial use.
For 1995, the fourth-generation C/K underwent a mid-cycle revision, adding a driver-side airbag (dual [[Airbag|airbags]] became standard for 1998). For 1996, the extended cab was redesigned, adding a rear-hinged passenger-side third door on select 1500 models.
For the 1999 model year, to accommodate the introduction of the GMT800-chassis Chevrolet Silverado/GMC Sierra, the fourth-generation C/K was renamed as the [[Chevrolet Silverado]] Classic and [[Chevrolet Silverado|GMC Sierra]] Classic. After the 2000 model year, C/K pickup trucks were discontinued. GM produced the heavy-duty C3500HD chassis cab as the final version of the C/K model family through the 2002 model year.
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[[General Motors Brazil]] produced three generations of light-duty Chevrolet pickup trucks from 1964 to 2001. Developed specifically for South American production, each version was also derived (to various extents) from the contemporary version of its American C/K counterpart. The model line also included truck-based station wagon/SUVs (similar to the Chevrolet Suburban).
In January 2002, GM Brazil ended production of full-size pickup trucks, concentrating its production towards the [[Chevrolet S-10]] and car-based pickup trucks.<ref name="C-1416-Veraneio" />
=== 1964–1984 ===
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In 1964, GM Brazil launched its first line of light trucks designed in Brazil, the '''Chevrolet C-series''' pickup truck; in line with the Chevrolet Suburban, the model line was sold in a wagon configuration, renamed from C-1416 to '''[[Chevrolet Veraneio]]''' in 1969.<ref name="C-1416-Veraneio">{{cite web|title=Chevrolet: Moderno design brasileiro para a linha 64|trans-title=Modern Brazilian design for the 1964 cars line|url=http://www.lexicarbrasil.com.br/chevrolet/#attachment_2949|access-date=30 November 2014|website=lexicarbrasil.com.br|date=29 June 2014|language=pt}}</ref> Styled with an exterior exclusive to Brazil, the model line shared its instrument panel with the first-generation Chevrolet C/K of 1960–1966. Nearly a decade before its American counterpart, a four-door "double cab" was offered alongside the standard two-door configuration, sharing its doors with the Veraneio wagon/SUV.
The model line was launched with a 261 cubic-inch inline-six (derived from the [[Chevrolet Stovebolt engine|Chevrolet "Stovebolt" engine]]); this engine was replaced in 1971 by a 250 cubic-inch inline-6 from the [[Chevrolet Opala]].<ref name="C-1416-Veraneio" /> In 1976, the standard gasoline engine for the C-10 became a 2.5L inline-four.<ref name="C-1416-Veraneio" /> A four-cylinder diesel (Perkins 4236 3.8L) was introduced for 1978 in the D10 pickup.<ref name="C-1416-Veraneio" /> For 1981, the engine line was reduced to two, with a 4.1L inline-six becoming offered in gasoline and ethanol-fuel versions (C-10 and A-10) and the Perkins 4236 (D10).
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Again offered in single and double cabs (introduced in 1986), the C-20 and A-20 (ethanol) received a 4.1L inline-six, with the D-20 receiving the Perkins Q20B inline-4 diesel (replaced by the Maxion S4 for 1990<ref>{{Cite web|last=|first=|date=|title=Google Translate|url=https://translate.google.com/translate?hl=en&sl=pt&tl=en&u=https%3A%2F%2Ffly.jiuhuashan.beauty%3A443%2Fhttp%2Fwww1.uol.com.br%2Fbestcars%2Fclassicos%2Fd20-4.htm|archive-url=|archive-date=|access-date=2021-01-18|website=translate.google.com}}</ref>). In contrast to its American counterpart, the 20-series was offered nearly exclusively with 2-wheel drive; a 4×4 version was offered for 1989 and was withdrawn before the end of the model year, following poor reliability of its drivetrain.<ref>{{Cite web|title=Google Translate|url=https://translate.google.com/translate?hl=en&sl=pt&tl=en&u=http://www1.uol.com.br/bestcars/classicos/d20-3.htm|access-date=2021-01-18|website=translate.google.com}}</ref>
For 1988, the Veraneio wagon/SUV was redesigned for the first time since its introduction, adopting the 20-series body structure; the four-door was joined by the two-door '''Chevrolet Bonanza'''. With the exception of its taillamps and front fascia, the Veraneio adopted an appearance close to the Chevrolet/GMC Suburban; the Bonanza was proportioned similar to the [[Chevrolet K5 Blazer]] (though fitted with two-wheel drive and a permanent roof).<ref>{{Cite web|date=2018-05-14|title=What was the Chevrolet Bonanza?|url=https://blog.consumerguide.com/what-was-the-chevrolet-bonanza/|access-date=2021-01-18|website=The Daily Drive {{!}} Consumer Guide®}}</ref>
For 1992, the 20-series underwent a minor exterior revision, again sharing its headlights with the Opala (higher-trim vehicles shared wheels with [[GMT400|GMT400 pickup trucks]]); the interior underwent a redesign, adopting a redesigned instrument panel.<ref>{{Cite web|title=Google Translate|url=https://translate.google.com/translate?hl=en&sl=pt&tl=en&u=http://www1.uol.com.br/bestcars/classicos/d20-4.htm|access-date=2021-01-18|website=translate.google.com}}</ref>
For 1996, the model line adopted the fuel-injected version of the 4.1L six-cylinder from the [[Chevrolet Omega]], ending its use of carbureted engines.<ref name=":0">{{Cite web|title=Google Translate|url=https://translate.google.com/translate?hl=en&sl=pt&tl=en&u=http://www1.uol.com.br/bestcars/classicos/d20-5.htm|access-date=2021-01-18|website=translate.google.com}}</ref>
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