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Internal View of a Typical Automatic Transmission

Subaru 38325AA032 Automatic Transmission Filter

$96.00


Hydra-Matic 4L65-E Four-Speed Automatic Transmission

The multitude of parts, along with the complex design of the valve body, originally made hydraulic automatic transmissions much more complicated (and expensive) to build and repair than manual transmissions. In most cars (except US family, luxury, sport-utility vehicle, and minivan models) they have usually been extra-cost options for this reason. Mass manufacturing and decades of improvement have reduced this cost gap.

A fundamentally different type of automatic transmission is the or , which can smoothly and steplessly alter its by varying the diameter of a pair of or -linked , or cones. Some continuously variable transmissions use a drive — consisting of a and a hydraulic motor — to transmit power without gears. Some early forms, such as the Hall system (which dates back to 1896), used a fixed displacement pump and a variable displacement motor, and were designed to provide robust variable transmission for early commercial heavy motor vehicles. CVT designs are usually as fuel efficient as manual transmissions in city driving, but early designs lose efficiency as engine speed increases.

Assembling An Automatic Transmission

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TRANSMISSION FRICTION OVERDRIVE DIRECT .064" A518, A618, 46/47/,  TRANSMISSION PARTS, DODGE TRANSMISSION PARTS, AUTOMATIC TRANSMISSION PARTS ONLINE
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SuperMatic 4L85-E Four-Speed Automatic Transmission

The AA80E (Aisin TL-80SN) becomes the world's first eight-speed automatic transmission. Smaller parts, a hydraulic circuit with fewer components allow the transmission to maintain the same size as the previous LS 430's unit. The aluminum case is 10% lighter, yet 30% more rigid, even with two additional gears and a 22% greater torque capacity the new transmission weighs 95 kg or 10% more than the previous unit. With new micro-laser technology gear tooth production tolerances have been reduced 50%. Aluminum has also replaced steel on gear tooth surfaces. Shift times are as low as 350 milliseconds or 41% faster than the previous LS 430's six-speed auto.

The hydraulic & lubricating oil, called (ATF), provides lubrication, corrosion prevention, and a hydraulic medium to convey mechanical power (for the operation of the transmission). Primarily made from refined petroleum, and processed to provide properties that promote smooth power transmission and increase service life, the ATF is one of the few parts of the automatic transmission that needs routine service as the vehicle ages.