The Plymouth GTX was introduced as the Belvedere GTX in 1967 by the Plymouth division to be a "gentleman's" muscle car.
In 1968, after one year of production, the GTX was given a completely new look. A new hourglass body replaced the more box-like body of 1967. The Road Runner was introduced by Plymouth as a performance version of the Satellite. There were major changes made in the design of all the Plymouth B-bodies. The Road Runner's base engine was the new 383 cu in (6.3 L) "Super Commando" V8 (renamed the "Road Runner 383"), while the high performance 440 was still standard in the GTX. The TorqueFlite automatic transmission was standard on the GTX, with it being a US$206 option in the Road Runner. The GTX used the Sport Satellite trim and was offered in two models, the two-door convertible and the two-door hardtop. The Road Runner used the Belvedere trim, and had less insulation and comfort items (padding, vinyl roof, trim), which reduced weight, helped produce better track times, and kept it in the low price field.
The 1970 GTX received a minor redesign (new grille and rear taillights) but sales still suffered as the car did not look much different from the Road Runner. Stylists made the lines smoother, and a "power bulge" hood was introduced, as well as non-functional rear brake air scoops. The convertible model was dropped in 1970. The Air Grabber hood was brought back, but instead of having two narrow openings running length-wise as in 1969, it had one opening scoop located on the power bulge. The GTX was available with the standard 440 four-barrel carburetor, as well as the 440+6 barrel (three two-barrel carburetors) and the 426 Hemi. In keeping with the GTX marketing strategy, the 1970 model included many standard features. The only other performance luxury model in Plymouth's lineup was the full-size Sport Fury GT, built on the C-Body platform. The GT was added to the lineup in 1970. The GT never received the recognition of the GTX, even though they shared many performance features. The Sport Fury GT was the full-size member of The Rapid Transit System. The Sport Fury GT was often viewed as more of a mature gentleman's performance luxury car. Also, GTX is one of the most sought after Plymouth models ever produced.
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