Wheel wells on GM trucks started off rounded, which goes perfectly with pickup tires, which are also round (like most tires). But in 1973, in a major departure from previous generations, the automaker updated what had become a tiresome design element with a new boxy esthetic. The change became so popular that Chevy models from that time are affectionately known as ‘Square Body’ trucks, and they’re still coveted by enthusiasts today.  These were some of the first Chevy trucks tested
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