Changes for the 1975 model year Gremlins included standard electronic ignition developed by Prestolite. All U.S. market Gremlins featured catalytic converters that required the use of unleaded regular-grade fuel. "Unleaded Fuel Only" warnings were placed by the fuel filler and on the fuel gauge. Gremlins with I6 engines and manual transmissions gained a new option, the electrically operated overdrive from Laycock de Normanville. The 0.714:1 "J-type" unit was controlled by a pushbutton at the end of the turn signal stalk. When turned on, the unit engaged automatically at speeds above and dropped out at . An accelerator pedal kickdown switch provided faster passing when needed. Steel-belted radial tires were now standard on Gremlins with the X package.