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en.wikipedia.org/wiki/Automatic_transmission

An automatic transmission, also called auto, self-shifting transmission, n-speed automatic (where n is its number of forward gear ratios), or AT, is a type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually.

en.wikipedia.org/wiki/List_of_GM_transmissions

Automatic transmissions Early models. The GM Hydra-Matic was a success and installed in the majority of GM models by 1950. Through the 1950s, all makers were working on their own automatic transmission, with four more developed inside GM alone.

en.wikipedia.org/wiki/List_of_Ford_transmissions

2003.5–2010 5R110W – 5-speed automatic with Tow/Haul mode – Replaces 4R100 in Super Duty trucks Ford Super Duty; 2011–present 6R140 - 6-speed automatic with Tow/Haul mode - Replaces 5R110W in Super Duty trucks. As of 2011 only transmission (manual or automatic) available in Ford Super Duty trucks. 2005–present Aisin AWF-21 6-speed

www.mistertransmission.com/a-brief-history-of-the-automatic-transmission

The Hydra-Matic Transmission. The original Hydra-Matic transmission was one of the most important innovations in the history of the automobile. It wasn’t the first automatic transmission, but it was the first one that really worked and its resounding commercial success paved the way for every subsequent autoshifter.

en.wikipedia.org/wiki/Hydramatic

Hydramatic (also known as Hydra-Matic) is an automatic transmission developed by both General Motors' Cadillac and Oldsmobile divisions. Introduced in 1939 for the 1940 model year vehicles, the Hydramatic was the first mass-produced fully automatic transmission developed for passenger automobile use.

www.mistertransmission.com/transmission-history

Automatic Transmission. The automatic transmission, introduced in 1939, switches to the optimum gear without driver intervention except for starting and going into reverse. The type of automatic transmission used on current American cars usually consists of a fluid device called a torque converter and a set of planetary gears.

itstillruns.com/history-manual-transmissions-5163365.html

Manual transmissions were the standard on most vehicle for the first half of the 20th century, but automatic transmissions were being developed as far back as 1904. General Motors introduced the clutchless automatic transmission under the moniker, Hydra-Matic, in 1938, but the first true fully automatic transmission didn't appear until 1948 ...

www.dailykos.com/.../-Automatic-Transmissions-The-History-of-A-Great-Innovation

Automatic cars, if not automatic transmissions, have been with us since the birth of the automobile really. In the 1910s, it was a 3 way race between internal combustion, steam, and electric.

www.aamcocolorado.com/evolution-of-the-transmission

The semi-automatic transmission can be likened to an electronically controlled manual transmission. Like manual transmissions, they are light and efficient. In some cases, the driver even has the option to maintain full control over the shifting, or put the transmission in full automatic mode. The dual clutch transmission uses two separate ...

en.wikipedia.org/wiki/List_of_Chrysler_transmissions

List of Chrysler transmissions. Jump to navigation Jump to search. Chrysler produces a number of automobile transmissions in-house. Semi-automatic. 1941–1942 M4 Vacamatic — 4-speed (2-range manual control with automatic 2 ... Semi-automatic. 1941–1942 M4 Vacamatic — 4-speed ...