Ford AOD transmission
 The AOD (for automatic overdrive) is a four-speed automatic transmission with overdrive. Introduced in 1980 it was Ford's first four-speed automatic overdrive transmission. The gearset design is based on the Ford X automatic transmissions used during the 1950s 60s and 70s. The AOD replaced many of Ford's older transmissions such as the C4 C5 and light duty applications of the FMX.