1977 GMC Trucks Sprint Sales Folder. Sprint...spirited elegance and practical convenience. GMC's Sprint speaks with elegance, spirit and authority on the road, at the club or on the job. The formal grille and dual rectangular headlamps enhance the Sierra Madre del Sur's strikingly handsome two-tone paint treatment, bright moldings and examplary coachwork. The Sprint Classic is slightly reserved in appearance, yet elegant and dramatic. The standard Sprint offers single, front power beams in combination with a boldly restyled grille. The Sprint SP model envelops our V8 engine in a sporty exterior that features paired Rally mirrors, dual side stripes with SP decals, Rally wheels, raised white letter radial tires and SP identification on grille and tailgate. Show interior trim. Back shows Sprint accessories. Form 77-4