Guess What Ride 69: Chevrolet Pickup Generation Sort
Think you know classic cars? GuessWhatRide? is a quiz on GuysWithRides.com designed to test your knowledge of classic rides.
General Motors designers often assigned internal names to each generation of post-World War II pickup lines. Names such as “Task Force,” “Rounded Line,” “Action Line,” “C/K,” and “GMT400” became synonymous with enthusiasts and designers alike.
The picture shown features images of five generations of Chevrolet pickups, each accompanied by a corresponding letter. Pick your answer from the multiple-choice answers provided below. All correct answers will be entered in a drawing for a $50 Harbor Freight Gift Card!
DON’T BE THAT GUY: PLEASE DO NOT COMMENT WITH YOUR ANSWER
January 13, 2026 Update
We ran this quiz from December 30, 2025, through 11:59 PM on Monday, January 12, 2026.
The Answer: “Rounded Line,” Not “Square Body”
Here’s the truth: General Motors’ internal code name for the 1973-1987 generation of Chevrolet and GMC light-duty trucks was actually “Rounded Line.”
When these trucks debuted, they featured subtle curves designed to improve styling and aerodynamics compared to their boxy predecessors. At the time, they looked sleeker and more modern. But fast forward forty years, and what seemed aerodynamic in the 1970s now looks pretty boxy by today’s standards. That’s how the popular “Square Body” nickname came about—even though it wasn’t GM’s original name.
Quiz Results
Only 45% of respondents correctly selected “None of the Above” on their first try. From those correct answers, we randomly selected Ride Tribe member Larry S. as the winner of a $50 Harbor Freight Gift Card. Congratulations, Larry!
Ready for More?
This quiz has ended, but you can test your classic car knowledge with our latest quiz on the Community page.
Contest Rules:
- No purchase is necessary.
- Only one entry per valid e-mail address. If someone attempts to enter multiple times, the oldest submission by date and time will be the only one entered into the drawing.
- Offer valid only to residents of the continental U.S.
- The quiz runs from Tuesday, December 30, 2025, through 11:59 PM Monday, January 12, 2026.
- Only entries registered via the multiple-choice contact form in this post will be entered into the drawing.
- No written replies in either the comments on this website or from Guys With Rides’ social media accounts will be accepted.
- On Tuesday, January 13, 2026, Guys With Rides will randomly draw one winner from all the correct entries, keep a record on file, and announce via our weekly email.
- The winner will be contacted to obtain their snail mail address, and one (1) Harbor Freight Gift Card will be mailed directly to them from the GuysWithRides office.
- Immediate family and Guys With Rides Exchange employees, Harbor Freight, or their affiliates are not eligible.
- Harbor Freight is not sponsoring this quiz. GuysWithRides is purchasing the prize at their local Harbor Freight store and mailing it directly to the winning name randomly drawn from the entrants received.
Great job,keep up the good work!!
In order from oldest to newest general motors truck lines Ibelieveit goes like this…, Task force (A), rounded line (D), action lin (C), square body (E), and lastly GMT400 (B)L