Story
1975 GMC Sprint
The 1975 Sprint was GMC's two-passenger, 116-inch-wheelbase coupe utility. One family page covers the regular Sprint, Sprint Classic, SP, High Sierra, Sierra Madre del Sur, and Estate appearance paths. Chevrolet El Camino is a related but separately branded vehicle, and Caballero did not replace the Sprint name until 1978.
Four factory engine paths
GMC's selector lists the 250-cubic-inch inline-six and 350, 400, and 454 V8s. The 250 and 350 could use the standard three-speed manual or Turbo Hydra-matic; the 400 and 454 required the automatic. A same-year GM engineering kit for the mechanically shared El Camino reports 105, 145, 175, and 215 SAE net horsepower for the confirmed one-barrel 250, two-barrel 350, four-barrel 400, and four-barrel 454 applications. Its separate 155-hp 350 four-barrel row is preserved only as a Chevrolet sibling boundary because the reviewed GMC selector does not confirm that Sprint application.
Axle, frame, suspension, and brakes
The standard rear ratio was 2.73:1. A 3.08 was available with the six, while 2.56 and 3.42 ratios were available with the V8s according to GMC's selector. The perimeter-frame chassis used independent coil-spring front suspension and a coil-sprung live rear axle. Hydraulic self-adjusting brakes combined 11-inch front discs with 9.5-by-2-inch rear drums, and the nominal fuel capacity was 26 gallons.
Trim and cabin choices
The regular and Classic models used a foam-padded bench, while optional 90-degree swivel bucket seats could be ordered with or without a center console. Classic equipment added upgraded moldings, a vinyl-coated headliner, an elm instrument-panel pad, and a fold-down center armrest. SP brought rally stripes, a bright grille, sport mirrors, raised-letter tires, and Rally wheels; High Sierra used woodgrain and additional bright moldings. Sierra Madre del Sur and Estate were separate appearance treatments shown in the factory brochure.
Identity, production, and price boundaries
Begin with the 5D80 model-year identity, title, shell, body and trim evidence, and ownership history, then reconcile engine, transmission, axle, emissions equipment, chassis, finish, cabin, and dated components. A secondary valuation guide reports a $3,828 base MSRP, but no reviewed effective-date GMC schedule resolves every trim and option charge. No reviewed serial-distinct factory ledger establishes 1975 Sprint production by engine, transmission, axle, trim, paint, plant, date, market, or survivor status.