Car: GMC Sprint
What makes it special: After years of success for the Chevrolet El Camino, General Motors wanted GMC to have a version for their very own.
What made it famous: Like it's corporate cousin El Camino, it married passenger car and utility capabilities. Plus you could order GMC's "SS" version, called the "Sprint SP".
Why I would want one: The Sprint SP could be ordered with a 350 or 396 cu in V8, or you could step up to the SP 454, with the 365 hp LS-5 Chevrolet 454 V8. The 454 came with the mandatory Turbo-hydramatic automatic, while you could still get the 4-speed manual with the 350 hp 396.
Fun fact: They're pretty rare trucks: only 249 GMC Sprint SP’s were produced for the 1971 model year, (of that, only about 25 were the SP 454 versions.) A very limited number got the optional cowl-induction hood. For the 1972 model year, SP production was a whopping 749.
Photo from photogallery.classiccars.com