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©2007 Publications International, Ltd. Midsize Plymouth muscle cars got no better than the 1968 GTX. See more muscle car pictures.

With the hot new Road Runner anchoring the lower rungs, a familiar name returned to top off Plymouth's midsize muscle car ladder. For its second season in 1968, the Plymouth GTX moved to the same redesigned Belvedere platform used by the Road Runner.

In keeping with its upscale mission, the 1968 Plymouth GTX featured two-door hardtop and convertible body styles; the '68 Road Runner started with a pillared coupe and didn't offer a ragtop.

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Instead of adopting the 383-cid V-8 as its base engine, the 1968 Plymouth GTX carried over its '67 powertrains. The 375-bhp Magnum 440-cid four-barrel was standard, with the take-no-prisoners 425-bhp 426 Hemi the sole engine option. TorqueFlite automatic, a $206 extra on the Road Runner, was standard on the GTX, and the four-speed manual was a no-cost alternative. Both cars had similar suspension upgrades and wide-oval rubber; front disc brakes and a limited-slip diff were shared options. Nonfunctional hood vents also were common to both.

©2007 Publications International, Ltd. The GTX was based on the two-door Belvedere, but it was the only Plymouth equipped with the 375-bhp 440 four-barrel.

While even a loaded Road Runner looked pretty plain on the outside, the GTX dressed its part with standard chrome wheel-lip moldings, tail-panel brightwork, and double side stripes. And where the Road Runner started with a fleet-grade interior, the GTX came with the well-appointed Sport Satellite cabin featuring shiny details and fake woodgrain. The differences showed in base prices: $3,355 for the GTX hardtop, $3,034 for the Road Runner coupe.

©2007 Publications International, Ltd. All 1968 Plymouth GTXs used the upscale bucket-seat Sport Satellite interior.

Die-hard racer types loved the Hemi, but just 450 GTXs were ordered with the $564 option. The 440, which wasn't offered on the Road Runner, was easier to keep in tune. And unlike the rev-hungry Hemi, the big wedge churned out a surplus of low-end torque for unparalleled response on the street.

Deficiencies mirrored those of the Road Runner -- and of most other muscle intermediates: stiff ride, over-assisted power steering, and skittish handling on rough roads. But for a gentleman's supercar, the GTX was dialed in.

©2007 Publications International, Ltd. This car's chrome steel wheels were a factory option.

"As a performance car, the GTX has few equals," concluded Car Life. "With the 440 engine, it offers as much performance-per-dollar as anything on the market, and more than most."

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