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Automatic transmission fluids have many performance-enhancing chemicals added to the fluid to meet the demands of each transmission. [ citation needed ] Some ATF specifications are open to competing brands, such as the common DEXRON specification, where different manufacturers use different chemicals to meet the same performance specification.
The transmission fluid will quickly overheat, not to mention the repeated impacts on the stator clutch (next topic). Also, overheating transmission fluid causes it to lose viscosity and damage the transmission. Such abuse can in rare cases cause the torque converter to leak and eventually stop functioning due to lack of fluid.
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. The 1904 Sturtevant ...
Beginning in 1998 a new 300mm torque converter with improved higher-capacity internals, 300mm style input shaft, and 300mm style pump was also introduced on models coupled to a Gen III Small Block. The 4L60E is rated to handle up to 360 ft⋅lb (490 N⋅m) of torque. It weighs 133 pounds without transmission fluid. [1]
This was the world's first automatic transmission fluid, designed for the world's first mass-produced automatic transmission. [ 2 ] This fluid had cold-weather performance problems, which led to the need for an improved fluid, the Type "A" fluid, in 1949.
The Hydra-Matic 6T40 and similar 6T30, 6T45, and 6T50 are transversely-mounted six speed automatic transmissions produced by General Motors.The 6T40, referred to in GM inner circles as the GF6, made its debut in the 2008 Chevrolet Malibu, available with the 2.4 L LE5 Ecotec engine making 164 horsepower (122 kW), and has since also been made available on the Chevrolet Cruze, Daewoo Tosca and ...
The rear pump was an unregulated gear pump driven from the transmission output shaft, which meant it was capable of pressurizing the transmission if the vehicle was in motion. This feature made it possible to push-start a vehicle with a dead battery if the vehicle could be accelerated to at least 15–20 mph (24–32 km/h).
Some modern automatic transaxles (integrated transmission and differential) do not use a heavy oil at all but lubricate with the lower viscosity hydraulic fluid, which is available at pressure within the automatic transmission. Gear oils account for about 20% of the lubricant market. [1]