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For the 1981 model year, a lock-up torque converter was introduced which coincided with the new EMC control of most GM cars; this version is the THM350-C, which was phased out in 1984 in GM passenger cars for the 700R4. Chevrolet/GMC trucks and vans used the THM350-C until 1986. The lock-up torque converter was unpopular with transmission builders.
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.
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.
Toledo Propulsion Systems (previously called Toledo Transmission Operations, TTO, and Powertrain Toledo) is a 2.8 million square feet; 151 acres General Motors transmission factory in Toledo, Ohio. The plant manufactures and assembles GM’s six-speed, eight-speed and ten-speed rear-wheel-drive and nine-speed front-wheel-drive transmissions ...
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 ...
There was also a choice between a three-speed automatic transmission, the Turbo-Hydramatic TH350, or one of two fully-synchronized manual transmissions: a three-speed, or a four-speed , which included a "granny gear" low-ratio 6.55:1 first gear. [5]
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