1970 Plymouth Road Runner
A number of minor cosmetic changes were made to the Road Runner in 1970, similar to those made to all 16 models in Plymouth's mid-sized lineup. This included new grilles, hoods, and fenders. To keep prices down, a three-speed manual gearbox replaced the four-speed as standard equipment. Production was down significantly (see chart below) from its high in 1969, which was probably due in part to heavy competition in the muscle car market for 1970, the year that saw the introduction of Plymouth's redesigned Barracuda and its sister car the new Dodge Challenger.