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A semi-automatic transmission is a multiple-speed transmission where part of its operation is automated (typically the actuation of the clutch), but the driver's input is still required to launch the vehicle from a standstill and to manually change gears.
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]
Automatic transmission fluid (ATF) is a hydraulic fluid that is essential for the proper functioning of vehicles equipped with automatic transmissions. Usually, it is coloured red or green to differentiate it from motor oil and other fluids in the vehicle.
The M6 Presto-Matic was a Chrysler Corporation semi-automatic transmission produced from 1946 to 1953. It was a special manual transmission with a fluid coupling.Although it had just two forward gears, an electric overdrive unit was attached and useful in either gear for a total of four forward speeds.
This was quickly changed to "Hondamatic". This gearbox was a separate unit and used ATF - Automatic Transmission Fluid. The company's naming scheme is also confusing, as it is specific to a single model of the vehicle and some identifiers are reused. Below is a list of Honda automatic transmissions: [4] 1973–1979 H2 — 2-speed
This unit was an early semi-automatic transmission, based on the design of a conventional manual transmission, which used a servo-controlled vacuum-operated clutch system, with three different gear shifting modes, at the touch of a button; manual shifting and manual clutch operation (fully manual), manual shifting with automated clutch ...
The fluid drive fluid coupling was also used in conjunction with Chrysler's M6 Presto-Matic semi-automatic transmissions. The M6 was in reality a two-speed manual transmission with a conventional clutch mounted behind the same fluid coupling unit that was installed in straight Fluid Drive cars. The M4 Vacamatic had two forward speeds and reverse.
In 1959, Ford released their own Type-A automatic transmission fluid specification (M2C33-A) and stopped using GM fluid specifications for their in-house transmissions. The Ford M2C33-A fluid had GM Type "A" Suffix "A" characteristics. Transmission fluid service life was fairly short, and frequent transmission oil changes were required.