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Second generation
Overview
Production	1967–1972
Assembly	Atlanta, Georgia Baltimore, Maryland Pontiac, Michigan Flint, Michigan Tarrytown, New York Kansas City, Missouri St. Louis, Missouri Janesville, Wisconsin Norwood, Ohio Fremont, California Oshawa Buenos Aires, Argentina Seoul, South Korea Dover, England Shanghai, China
Body and chassis
Related	Chevrolet Silverado Chevrolet K5 Blazer Chevrolet Suburban
Powertrain
Engine	250 cu in (4.1 L) I6 292 cu in (4.8 L) I6 283 cu in (4.6 L) V8 307 cu in (5.0 L) V8 327 cu in (5.4 L) V8 350 cu in (5.7 L) V8 396 cu in (6.5 L) V8 402 cu in (6.6 L) V8 GMC models continued to offer the 305 and 351 c.i. V6s through 1970.
Transmission	3-speed manual 4-speed Muncie SM420 manual 4-speed Muncie SM465 manual 4-speed New Process NP435 manual 2-speed Powerglide automatic 3-speed THM-350 automatic 3-speed THM-400 automatic
Dimensions
Wheelbase	115 in (2,921 mm) (short box) 127 in (3,226 mm) (long box) 133 in (3,378 mm) (Longhorn)
Length	188.5 in (4,788 mm) (short box) 207.75 in (5,277 mm) (long box) 213.75 in (5,429 mm) (Longhorn Fleetside) 217.75 in (5,531 mm) (Longhorn Stepside)

A new, more modern look came in 1967, along with a new nickname: "Action Line".

It was with this revision of the C/K truck that General Motors began to add comfort and convenience items to a vehicle line that had previously been for work purposes alone. Updated styling features for the 1967 Chevy Pickup trucks came with new body sheet metal that helps fight rust. The majority of 10 and 20 series Chevrolet trucks from 1967 to 1972 were built with a coil spring trailing arm rear suspension, which greatly improved the ride over traditional leaf springs. However, the leaf spring rear suspension was still available on those trucks, and standard on 30 series trucks. The front suspension on all Chevrolet trucks were independent front suspension with coil springs. GMC models came standard with leaf springs with coils springs optional; all four-wheel drive models (Chevrolet and GMC) had leaf springs on both axles. 1967 was the only year for the "small rear window" (RPO A10 offered a large rear window as a factory option). The standard drivetrain came with a three-speed manual transmission and one of two engines; the 250 in³ straight six or the 283 cu in (4.6 L) V8. The optional transmissions were the four-speed manual, the Powerglide and the Turbo-Hydramatic 350 and 400. The 292 six and the 327 in³ V8 were the optional engines. The 1/2 ton trucks came with a 6 x 5.5–inch bolt pattern, the 3/4 and 1 ton trucks came with an 8 x 6.5–inch bolt pattern.

The most visible change in differentiating a 1968 from a 1967 was the addition of side-marker reflectors on all fenders. Also, the small rear window cab was no longer available (the C40 and C60 medium duty trucks retained the small window). The GMC grille was revised, with the letters "GMC" no longer embossed in the horizontal crossbar. Another addition was the Custom Comfort and Convenience interior package that fell between the Standard cab and CST cab options. In 1968, Chevrolet celebrated 50 years of truck manufacturing, and to commemorate, they released a 50th Anniversary package, which featured an exclusive white-gold-white paint scheme. Also in 1968, the Longhorn model debuted on 3/4 ton trucks. Featuring a 133-inch wheelbase similar to the one-ton vehicles, it added an extra 6 inches to the bed. Longhorns, interestingly, were only 2wd; no factory Longhorn 4x4 was built.

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  1967 GMC C/K

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  1968 GMC C/K

The 327 c.i. V-8 engine was enlarged in 1969 to 350 CID (stroke increased from 3.25 to 3.48) with a net horsepower rating of 195-200, depending on emissions package 255 hp (190 kW), 350 cu in (5.7 L). Along with the new engines came a new grille design for Chevrolet trucks and a more upright hood for both Chevrolet and GMC trucks. A utility variant, known as the K5 Blazer, was also introduced with a shorter wheelbase of 104 inches (2,642 mm). The GMC version, known as the Jimmy, was introduced the same year. Some internal cab changes were also made, most notably the switch from a hand-operated parking brake to a foot pedal, and a more modern looking two-spoke steering wheel with plastic horn button replaced the previous year's three-spoke wheel with chrome horn button. Also new this year were upper and lower side moldings, which added another two-tone paint option. These were standard on CST trucks, and optional in any other trim level.

The only noticeable change for 1970 was a minor update to the Chevrolet grille. At first glance, the 1969 and 1970 grilles look very similar. However, the 1970s plastic inserts actually have highlights that divide the appearance into six separate sections. The 396, while still sold as such, was enlarged to 402 cubic inches starting in 1970.

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  1970 Chevrolet C-10 with the Custom trim level

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  1970 GMC C/K

Numerous changes occurred in 1971. First came another new grille design (the "egg crate") for Chevrolet trucks and black paint over portions of the GMC grille. Second, an additional trim package was introduced: the Cheyenne. On GMC models, this was referred to as the Sierra. These packages consisted mostly of comfort features — nicer interiors, more padding and insulation, carpet, chrome trim, and upper and lower side molding and tailgate trim. 1971 was the first year for AM/FM radios factory installed. Finally, the front brakes on all light-duty trucks were switched from drum brakes to disc brakes, resulting in much less brake fade under heavy use. While many prior C/K half-ton trucks had used a six-lug bolt pattern (6 x 5.5") for the wheels, two-wheel-drive models switched to a five-lug pattern (5 x 5–inch bolt circle) common to Buick, Oldsmobile, Pontiac, and Cadillac passenger cars. The 1/2 ton 4 x 4 retained the 6 lug bolt pattern. This bolt pattern would remain the standard through the end of the C/K series (along with the Chevrolet/GMC vans). The one ton (C30) trucks had the 8 x 6.5" pattern. Also, Chevrolet changed the 396 V8 emblem designation to 400 V8.

The 1972 models were virtually similar to the 1971 models, with the only change being the rear view mirror was glued to the windshield rather than bolted to top of the cab, and metal or vinyl-covered flat door panels were no longer available; all trim level door panels were molded plastic with integral armrests and wood grain inserts on Cheyenne and Sierra trim levels. For restoration, it should also be noted that the door and window cranks were slightly longer due to the molded plastic door panels, and the vent windows were now secured with a single screw on the inside of the door, thus differentiating it from the 1971 model year.

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  1971 Chevrolet C/50 medium-duty truck

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  1971 Chevrolet C-20 Custom

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  71-72 Chevrolet C/10 Cheyenne

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  1972 GMC C-Series with the Sierra trim level

Engines

Year	1967	1968	1969	1970	1971	1972
Inline 6	250 in3 292 in3	250 in3 292 in3	250 in3 292 in3	250 in3 292 in3	250 in3 292 in3	250 in3 292 in3
V6 (GMC)	305 in3 351 in3	305 in3 351 in3	305 in3
V8	283 in3 327 in3	307 in3 327 in3 396 in3	307 in3 350 in3 396 in3	307 in3 350 in3 396 in3	307 in3 350 in3 402 in3	307 in3 350 in3 402 in3

Trim Levels (Chevrolet)

Years	Base	Mid-level	High-level	Top-line
1967–70	Standard	Custom	--	CST (Custom Sport Truck)
1971	Custom	Custom Deluxe	--	Cheyenne
late 1971–72	Custom	Custom Deluxe	Cheyenne	Cheyenne Super

A 10, 20, or 30 on the emblem indicates  ¹⁄₂-,  ³⁄₄-, or 1-ton trucks. There are also 40- to 80-series medium- and heavy-duty trucks:

• medium-duty
  •  1 ¹⁄₂-ton C40;
  • "light" 2-ton C50;
  • 2-ton C60;
• heavy-duty
  • "light"  2 ¹⁄₂-ton C70;
  •  2 ¹⁄₂-ton C80.

These models share the cabin of the light-duty models but sit on a taller chassis and have a taller front end of a different design, with a clamshell hood.

Trim Levels (GMC)

Years	Base	Mid-level	High-level	Top-line
1967–71	Deluxe	Custom	--	Super Custom
1972	Custom	Super Custom	Sierra	Sierra Grande

1500, 2500, and 3500 designations were used to indicate  ¹⁄₂-,  ³⁄₄- and 1-ton trucks.

In both series, the 'Highlander package' included special color-coordinated houndstooth cloth inserts and additional trim colors and insulation.