The B-body was redesigned for 1971 and featured rounded "fuselage" styling with a raked windshield, hidden cowl, and a loop-type front bumper around a deeply inset grille and headlights. This was the final year for the GTX as a stand-alone model. The convertible body style was dropped.
Engine choices were 440 four-barrel, 440 with three two-barrels (Six Pack), and 426 Hemi. Emission restrictions such as lower compression ratios and faster-acting choke operation lowered the base 440 output by 5 hp (3.7 kW), to 370 hp (280 kW). The 440 Six Barrel was down to 385 hp (287 kW), but the Hemi was still rated at 425 hp (317 kW). Due partly to rising insurance rates on muscle cars, sales were low. There were less than 3,000 units produced in 1971.
For 1972 through 1974, any Road Runner ordered with the optional 440 was renamed Road Runner GTX and included the badging of both previous models.