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Chop It!The '60-'72 GM light-truck series had several wheelbase options, the two most popular being the shortbed at 115 inches and the longbed topping out at 127 inches. Over the years, many longbed chassis have been shortened, and the process is not that complicated. Shown here are two bare frame examples. You can see that not only is the length different but also the placement of the various crossmembers.