1983 Chevrolet K20 Diesel

July 6, 2021 Update – The high bid during the auction for this diesel-powered 1983 Chevrolet K20 was only $9,000. The buy-now price is $19,500, however, if you would like to make a realistic offer, you can register and enter it in the “BID DIRECTLY” box.

Chevrolet’s “Square Body” C/K line of light-duty pickups produced from 1973 through 1987 is currently enjoying huge popularity as enthusiasts gravitate to modifying this vintage of pickup. Ironically, Chevrolet internally referred to this generation of pickup as the “Rounded Line” when first introduced as many of the truck’s styling cues were much softer than the “Action Line” it replaced.

As demand in the early 1980s for better fuel economy increased, Chevrolet answered by introducing a 6.2 Liter (379 cubic inch) diesel V8 in 1982 for the Chevrolet C/K that continued through 1993. The 6.2 Liter diesel emerged as a high-MPG alternative to the V8 gasoline engine lineup, and achieved better mileage than the General Motors 4.3 L V6 gasoline engines of the 1980s, at a time when the market was focused on power rather than efficiency. However, it was designed to easily install in place of the gasoline V8, using the same mounting and attachments for transmissions as all GM truck engines. Overall weight for the complete engine is slightly heavier than the 454 cubic inch gasoline engine also offered during that period.

If you’re old enough to remember the 1980s TV Show The Fall Guy, then you’ll likely remember actor Lee Majors, the star of the show, who drove a Square Body with the same color combination as this truck we are featuring.

We’re pleased to offer at auction this 1983 Chevrolet K20 3/4 Ton 4×4 pickup featuring a factory-installed 6.2 Liter diesel engine.  The current caretaker, Brian, thoroughly enjoys this truck. However, too many projects and too little storage have him looking to sell his Square Body. Not satisfied with the truck’s factory power output, Brian took things up a notch by installing a Gale Banks turbocharger specifically designed for this application. Not stopping there, Brian installed a complete LMC Truck interior upgrade package that frankly could hold its own to any modern truck interior materials. The truck also benefits from a one-year-old paint job that both the inspector and the pictures provided confirm presents well.

The LemonSquad Pre-Purchase Inspection (“PPI”) confirmed this K20 to be in excellent condition considering its 159K original miles.  To read the full report, please click on the picture below:

Important Note:

In the report, the inspector made the following inaccurate comments:

  1. He comments the spare tire is missing, however, his very own pictures of the underside show the spare tire in its proper under-bed mounting location.
  2. The inspector incorrectly commented the seats look worn when in fact the seller recently installed this LMC Truck Signature Series Seat and Console that clearly has a distressed leather look. The seller reports the brand new seats have only been sat in several times.
  3. The report also confirmed that the only thing not working on the truck at this time is the factory cruise control.  Brian notes that even the factory dual tanks work as designed.

To give you a sense of the current market value of 1983 Chevrolet K20 Trucks, the interactive graph provided by Classic.Com provides examples of comparable trucks sold within the last two years.   By clicking the green dots, you inspect each past sale to help you make an informed bid on the K20 we are auctioning here:


If you have any questions about this diesel-powered K20 Square Body, please review the comment thread below, and if your question has not been addressed, write it below so that other bidders with similar questions can see the answers.  Thank you for looking and happy bidding!

  1. Anonymous

    Its the “Fall Guy” truck!

    • Guys with Rides

      At one point, that’s what the seller planned to do with the truck, but too many projects got in the way.

  2. Mary

    What is the reserve price on this?

    • Guys with Rides

      Hi Mary, as is standard practice with all reserve auctions, the reserve price is not disclosed until a bid at least equalling has been received. If the reserve price is not met at the end of the auction, we will work with the high bidder and the seller to try and come to an agreement to close the sale.

  3. joe

    Lemon report says there was no spare tire found but the pictures clearly show that the spare tire is attached to the undercarraige. Has it been removed?

    • Guys with Rides

      Hi Joe,

      That was an error on the part of the inspector. The spare remains in place and will be included as part of the sale.

  4. Jeff

    Please confirm I see an A/C compressor on this truck. Functioning A/C?

    • Guys with Rides

      Yes, the truck is equipped with A/C. In the provided LemonSquad Pre-Purchase inspection, on page two the inspector gave a green checkmark to the A/C system so as far we know, the system works as designed.


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