The 1973 Chevy truck lineup—the C/K series—spanned two-wheel-drive C-series and four-wheel-drive K-series, offered a range of engines from a 4.1-liter inline-six to big-block V8s, plus manual and automatic transmissions. Configurations varied by model, bed length, and drive layout, giving buyers options for workhorse reliability or everyday use.
Overview of the 1973 Square-Body C/K Trucks
The 1973 model year ushered Chevrolet’s square-bodied design for its full-size pickups, a styling and engineering refresh that would define GM pickups through the mid/late 1980s. The lineup included light-duty and heavy-duty variants, with both two-wheel-drive (C-series) and four-wheel-drive (K-series) configurations. Buyers could choose different bed lengths and engines, tailoring the truck to tasks ranging from light daily use to tougher hauling jobs.
Engine options
For 1973, Chevrolet offered a range of engines to match performance needs and fuel economy concerns of the era. The main engines included a simple-to-tune inline-six and several V8 choices, with big-block options available on heavier models.
- 250 cubic inch inline-six (4.1 L)
- 350 cubic inch V8 (5.7 L) with 2-barrel or 4-barrel carburetion
- 400 cubic inch V8 (6.6 L) big-block
- 454 cubic inch V8 (7.4 L) big-block available on selected heavy-duty configurations
These engine options gave buyers a spectrum from economical daily driving to strong torque for towing and hauling jobs, with horsepower and torque figures varying by carburetor setup and emission controls of the time.
Transmissions and drivetrains
Transmission choices mirrored the era’s mix of manual and automatic options, with configurations that supported both light- and heavy-duty use.
- Three- or four-speed manual transmissions
- Three-speed automatic transmissions such as Turbo Hydramatic TH350
- Three-speed automatics like TH400 on certain heavier-duty models
Coupled with rear-wheel drive or four-wheel drive, these options allowed a range of performance, payload handling, and towing capabilities depending on the specific truck configuration.
Driveline and configuration
GM’s 1973 lineup covered both light-duty and heavy-duty applications, with two-wheel-drive models aimed at everyday use and four-wheel-drive versions designed for tougher terrain or work-site conditions. The four-wheel-drive trucks commonly featured a transfer case to enable 4x4 operation.
- C-series two-wheel-drive pickups (light-duty)
- K-series four-wheel-drive pickups (heavy-duty capable)
The combination of drive layout, bed length, and cab/trim level determined aspects like payload, towing capability, and overall ruggedness for various tasks.
What to know about the 1973 specs
Because the C/K line offered multiple combinations, exact specs depended on the chosen model, engine, and equipment package. Buyers could optimize the truck for economy, everyday work, or heavier hauling by mixing the engine choice, transmission type, and drive configuration.
Summary
The 1973 Chevy trucks marked the start of the square-body era, bringing a refreshed design and a versatile lineup. With engine options spanning from the 250 inline-six to 454 big-blocks, a range of transmissions (manual and automatic), and both two- and four-wheel-drive configurations, Chevrolet provided a broad spectrum of specs to fit a wide array of uses. As with any vintage truck, exact specifications varied by model, bed length, cab configuration, and option packages.