Replacing the Task Force range, the C/K was developed from the start as a truck chassis, no longer sharing commonality with the GM A-body platform.

Though developed as a truck for the sake of durability, the C/K adopted several features from cars into its design to increase its functionality.

While the first generation would not undergo a comprehensive facelift or update, GM would make a series of gradual changes to the model line through its production.

Designated the "Action Line" generation by General Motors, the C/K largely carried over its drop-center ladder frame and its coil-sprung rear axle, but the body was redesigned from the ground up to improve its capability as a multi-purpose vehicle.

Alongside a utilitarian vehicle intended for work or farm use, the C/K was also offered with optional features carried over from Chevrolet sedans, including automatic transmissions, AM/FM radio, carpet, and two-tone paint.

While the Action Line would not undergo a definitive model revision through its production, the series underwent gradual changes on a biannual basis.

While relatively straight-lined and boxy in appearance (leading to their "square-body" nickname from the public[2]) 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.

For 1987, it was renamed the R/V series (to accommodate the fourth-generation C/K marketed alongside it) and was gradually phased out through the 1991 model year.

Known officially by its GMT400 internal codename (GM never assigned this model line a generational moniker), these are informally known as the OBS (Old or Original Body Style).

[4] 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.

[8] 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).

[10] 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.

[11] For 1997, the 20-series (based on the 1973 "Rounded Line" pickups) was retired, with GM Brazil introducing the Argentine-produced Chevrolet Silverado.

After many years of declining market share in the truck segment, GM Brazil produced the final Silverado D-20 in January 2002.