GMC Sierra Grande 1977 Specs


1977 was a year of firsts. Apple Computers introduced its first personal computer, the NASA Space Shuttle went on its maiden flight and the movie "Saturday Night Fever" with John Travolta premiered. General Motors Corporation, GMC, maintained its long standing tradition of manufacturing rugged pickup trucks, producing the first one ton Sierra Grande.

Body and Cargo

  • The Sierra Grande in 1977 had three trims. Buyers had a choice of a short bed with an expanded cargo area of 117.5 inches, a long bed, with a cargo of 131.5 inches and a extended-cab model, which measured 164.5 inches from front to rear bumper. This massive vehicle was produced with a first-of-its-kind additional crew cab. Two versions of this cab were offered. One was a "Bonus Cab" with with a lockable storage area. The other cab had seating for six passengers.

Operational Improvements

  • The 1977 Sierra Grande offered a six-cylinder and eight-cylinder engine ranging from 250 to 450 cubic inches. Its transmission was designed with three-speed automatic or four-speed manual. It also had four-wheel drive, which had never before been offered in a truck, and featured a redesigned heavy duty front axle. A new electric oil pressure gauge premiered as well. A dual fuel tank was added as an option, doubling fuel capacity from 20 to 40 gallons, extending driving range and eliminating the need to stop as often to replenish fuel.

Cosmetics and Options

  • A few cosmetic changes and upgrades from previous years were evident in 1977. The grill insert was changed from 32 small rectangles to 15 larger ones. A sport package featured a black grill, multi-tone striping, color-keyed bumpers, rally wheels and white-lettered tires.The exterior body was designed with a chrome trim and had flat stainless hubcaps with white painted bumpers. The interior had rubber floor mats, with a choice of pleated or cloth seats. Additional options included power windows, brakes, steering, locks and air conditioning.


  • GMC trucks received a huge marketing boost when "The Fall Guy" featured Lee Majors driving a GMC Sierra Grande truck.

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