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When it is switched on, an automatic transmission can shift into overdrive mode after a certain speed is reached (usually 70+ km/h [40-45 mph or more] depending on the load). When it is off, the automatic transmission shifting is limited to the lower gears. Overdrive should usually be selected when the average speed is above 70 km/h (40-45 mph).
The AOD (automatic overdrive) is a four-speed automatic transmission, with the 4th gear as 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 ...
hide. Cutaway view of a 2007 Toyota AA80E hydraulic automatic. Typical gear selector for an automatic transmission. An automatic transmission (sometimes abbreviated AT) is a multi-speed transmission used in motor vehicles that does not require any input from the driver to change forward gears under normal driving conditions.
2005–present Aisin AWF-21 6-speed. Lincoln MKZ (2006–2010), Ford Fusion AWD (2007–2009), Land Rover LR2. 2005–2007 ZF -Batavia CFT30— Continuously variable transaxle (CVT) Ford Freestyle, Ford Five Hundred, Mercury Montego. 2005–2016 6R 60 ZF longitudinal 6-speed transmission.
The 4Txx family is an evolution of the original Turbo-Hydramatic 125 transverse automatic introduced in the late 1970s and the Turbo-Hydramatic 440 transmission developed in the mid-1980s. The "-E" transmission is electronically controlled and features an automatic overdrive transaxle with an electronically controlled torque converter clutch.
GM's Automatic Safety Transmission (AST) was a semi-automatic transmission released in 1937. The first mass-produced fully-automatic transmission developed for passenger automobile use was the GM Hydramatic introduced in 1940. [1] The Hydramatic was a big success, and had been installed in the majority of GM models by 1950.