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The first mass-produced fully-automatic transmission developed for passenger automobile use was the GM Hydramatic introduced in 1940. [1] The Hydramatic was a big success, and had been installed in the majority of GM models by 1950. Throughout the 1950s, all GM Marques continued developing automatic transmission designs, both jointly and ...
For manual transmission equipped cars, it is a component that replaces the stock gear selector (shifter). A shift kit usually shortens the throws of selecting a gear (also known as a short throw shift or short shifter), therefore allowing a driver to reduce the shift time and change gears more efficiently.
The 8L 90 is the first 8-speed automatic transmission built by General Motors. It was debuting in 2014 and is designed for use in longitudinal engine applications either attached to the front-located engine [ 3 ] with a standard bell housing or in the rear of the car adjacent to the differential (as in the Corvette).
The police package (9C1) B-body cars featured a First Gear Block Out (FGBO) Plate on the transmission housing to prevent drivetrain damage. The shift point for first to second gear is about 43 MPH (69 km/h) while second to third gear shift point is about 83 MPH (134 km/h) assuming a 3.08:1 differential and a 5,500 RPM engine speed limit.
A Hydra-Matic 4L80 transmission at the Ypsilanti Automotive Heritage Museum The 4L80-E ( RPO MT1) is rated to handle engines with up to 440 ft·lbf (597 N·m) of torque. [ 2 ] The 4L80-E is rated to a maximum GVWR of 18,000 lb, depending on the axle and vehicle.
The Automatic Safety Transmission (AST) was a tangent outgrowth of this work. The AST was a semi-automatic transmission using planetary gears and conventional friction clutch, requiring the driver to use the clutch to shift into or out of gear, but not between the two forward gears. Oldsmobile offered the AST from 1937 to 1939, while Buick ...
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