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Most notable of the improvements was the addition of a one-way clutch that provided smoother 1–2 up-shifts and 2–1 down-shifts. The transmission has a relatively low 1st gear and two overdrive gears, the highest of which is 0.69:1.
Such add-on overdrive boxes were available from the 1930s to the 1970s for cars and light trucks. Today, most petrol and diesel cars and trucks come with an overdrive transmission because of the benefit to fuel economy. [4] Overdrive is included in both automatic and manual transmissions as an extra gear (or two in some cases). [5]
Standard Motor Products had its Initial public offering in 1960 [3] and was listed on the New York Stock Exchange (NYSE) in 1977. [4] [5] [6] In 1963 it entered the wholesale parts market with a new subsidiary, Marathon Parts. [3] Beginning in the late 1960s under Lawrence "Larry" Sills, Fife's grandson, Standard acquired several rival ...
The THM 400 was utilized in the C- and K-series (full-size) Chevrolet/GMC pickups and G-series (full-size) vans until 1990 when GM switched over to the 4L80E. Today, the United States Army HMMWV is the only vehicle using the THM400. The civilian Hummer H1 originally had the 3L80s, but the current model has had a 4L80E since the mid-1990s.
Shared with C/K pickup trucks, a 4.3 L V6 was standard, while 5.0 L, 5.7 L, 6.5 L turbo-diesel, and 7.4 L V8s were options. [5] All gasoline engines adopted the "Vortec" port-fuel injection upgrades for 1996, increasing power and torque outputs; the 6.5 L turbo-diesel was offered in a GM full-size van for the first time.
Before this, the company used semi-automatic systems like a vacuum-powered shifting for overdrive or the "Hydrak" hydraulic automatic clutch system. Alternatively, they bought automatic transmissions of other vendors, such as the Detroit gear 3-speed automatic transmission from BorgWarner for the 300 c and 300 d (not to be confused with the ...
The 1952 Porsche 356 was the first car to use a transmission with synchromesh on all forward gears. [7] [8] In the early 1950s, most cars only had synchromesh for the shift from third gear to second gear (drivers' manuals in vehicles suggested that if the driver needed to shift from second to first, it was best to come to a complete stop ...
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.
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