Editing Turbo-Hydramatic (section)

{{Short description|Family of Transmissions from GM}}
{{Multiple issues|
{{more citations needed|date=July 2011}}
{{original research|date=July 2011}}
{{cleanup|date=July 2011}}
}}

{{Infobox automobile
|name=Turbo-Hydramatic
|production=1964–2012
|manufacturer=[[General Motors Corporation|General Motors]]
|class=3-speed [[longitudinal engine|longitudinal]] [[automatic transmission]]
|predecessor=[[Dynaflow]]<br/>[[Hydra-Matic]]<br/>[[Powerglide]]<br/>[[Super Turbine 300|Jetaway]]<br/>[[Super Turbine 300]]
|successor=[[GM 4L60-E transmission|4L60-E/4L65-E]]<br/>[[GM 4L80-E transmission|4L80-E/4L85-E]]
|related=[[Turbo-Hydramatic 125]]<br/>[[Turbo-Hydramatic 180]]<br/>[[Turbo-Hydramatic 425]]
}}

'''Turbo-Hydramatic''' or '''Turbo Hydra-Matic''' is the registered tradename for a family of [[automatic transmission]]s developed and produced by [[General Motors Corporation|General Motors]]. These transmissions mate a three-element [[turbine]] [[torque converter]] to a [[Simpson planetary gearset|Simpson planetary geartrain]], providing three forward [[gear ratio|speeds]] plus reverse.

The Turbo-Hydramatic or Turbo Hydra-Matic (THM) series was developed to replace both the original [[Hydramatic|Hydra-Matic models]] and the [[Buick]] [[Dynaflow]]. In its original incarnation as the Turbo-Hydramatic 400, it was first used in the 1964 model year in [[Cadillac]]s. The [[Buick]] version, which followed shortly thereafter, was known as the Super-Turbine 400. By 1973, THM units had replaced all of GM's other automatic transmissions including Chevrolet's [[Powerglide]], Buick's [[Super Turbine 300]], and Oldsmobile's [[Super Turbine 300|Jetaway]]. Starting in the early 1980s, the Turbo-Hydramatic was gradually supplanted by four-speed automatics, some of which continue to use the "Hydramatic" trade name.

Although the '''Turbo Hydra-Matic''' name alludes to the original Hydra-Matic developed by General Motors' Cadillac division in the late 1930s, the two transmissions were not mechanically related.