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Turbo-Hydramatic or Turbo Hydra-Matic is the registered tradename for a family of automatic transmissions developed and produced by General Motors.These transmissions mate a three-element turbine torque converter to a Simpson planetary geartrain, providing three forward speeds plus reverse.
The Super Turbine 300 was discontinued entirely after the 1969 model year in favor of the TH400 and lighter TH350 Turbo-Hydramatic, the latter using the Super Turbine 300's tailhousing.
GM's Automatic Safety Transmission (AST) was a semi-automatic transmission released in 1937. The first mass-produced fully-automatic transmission developed for passenger automobile use was the GM Hydramatic introduced in 1940. [1]
Also called the GM small corporate pattern and the S10 pattern. This pattern has a distinctive odd-sided hexagonal shape. Rear wheel drive applications have the starter mounted on the right side of the block (when viewed from the flywheel) and on the opposite side of the block compared to front wheel drive installations.
A T-18/T-18a four-speed manual gearbox was standard for all years, while through 1979 the General Motors' Turbo-Hydramatic TH400, more commonly fitted to 3/4- and 1-ton trucks rather than SUVs, was optional. For comparison, GM’s own SUV, the Chevy Blazer, used the TH350 automatic. After 1979, the TH400 was replaced by the Chrysler TorqueFlite ...
This was a combination never offered to the public. When built with the Pontiac 400 engine, the Can Am came with the three-speed automatic TH400 and 3.08 rear gears. When built with the Olds 403 engine for cars sold in California, the Can Am came with the three speed automatic TH350 and 2.41 rear gears.
The TH400 3-speed automatic was now available as an option (RPO M40) with the 396 engine in both the SS396 series and the 396-equipped El Caminos. The 3-speed manual transmission remained the standard transmission with a heavy duty (RPO M13) also available along with the 2-speed Powerglide and either M20 wide ratio or M21 close ratio 4-speed ...
The TH350 drew less power and also did not require an electronic kick down system. The Pontiac L78 400 was standard in the Trans Am and the 455 was optional for both 1975 and 1976 models. 1975 also saw the start of the "500557" (in addition to similar cast codes starting with 5) cast 400 engine blocks entering production.