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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.
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.
For 1995, all Trans Ams received 155-mph speedometers and Z-rated tires. 1995 was also the first year of the vented version of the Opti-Spark distributors on LT1 F-cars, addressing a common mechanical fault with the unit. The 'transmission perform' button was available only in the 1994 and 1995 Formula and Trans Am.
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 ...
When introduced on upper-level Chevrolet models in 1950, the Powerglide represented the first automatic transmission offered in a low-priced automobile; in contrast, Ford did not offer their automatic transmission until 1951, while Plymouth car buyers had to wait until 1954. The transmission was simple and very durable, which satisfied customers.
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 ...
A 3-speed manual transmission was offered through the 1980 model year, with a 4-speed manual offered through 1987. Initially offered with 3-speed Turbo Hydra-Matic 350 and 400 automatic transmissions, a 4-speed Turbo Hydra-Matic 700R4 became an option in 1981.