	In 1981, Ford would take steps to further increase the fuel economy of its full-size cars. From the Lincoln Continental/Mark VI, all Panther-platform cars received the 4-speed AOD overdrive automatic transmission, replacing all previous 3-speed automatics. The engine line was revised: the 5.8 L V8 was restricted exclusively to fleet (police) sales, with a 4.2 L version of the 4.9 L V8 becoming the new base engine. The 4.9 L V8 saw major changes, with the carburetor replaced by throttle-body "electronic central fuel injection". In contrast to competitors from General Motors and Chrysler, the LTD Crown Victoria was sold exclusively with a V8 engine.