GM used a Switch Pitch torque converter in the Buick twin turbine Dynaflow transmission between 1955–1963 and the Super Turbine 300 two speed transmissions used by Oldsmobile, Pontiac (Pontiac's ST300 didn't have a switch pitch), and Buick divisions between 19. Externally the switch pitch version has two electrical connections, where the non-switch pitch THM400 has only one. These can be identified outside the vehicle (with the torque converter removed) by a narrow front pump spline. Many of the Buick, Cadillac, and Oldsmobile THM400s produced between 19 were equipped with a "Switch-Pitch" torque converter with a variable-pitch stator, which is sought after by collectors and drag racers. The following year, application expanded to Oldsmobile and Pontiac and to some full-sized Chevrolets. First introduced for the 1964 model year under the name "Turbo Hydra-Matic" in Cadillacs and "Super Turbine" in Buicks. ![]() The THM400 can be visually identified by an oil pan number four shown at General Motors Transmission Pans. Super Turbine 400 / THM400 / THM375 / 3L80 / 3L80HD Turbo-Hydramatic 400 Transmission 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.Īlthough 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. 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 Jetaway. The Buick version, which followed shortly thereafter, was known as the Super-Turbine 400. In its original incarnation as the Turbo-Hydramatic 400, it was first used in the 1964 model year in Cadillacs. The Turbo-Hydramatic or Turbo Hydra-Matic (THM) series was developed to replace both the original Hydra-Matic models and the Buick Dynaflow. These transmissions mate a three-element turbine torque converter to a Simpson planetary geartrain, providing three forward speeds plus reverse. Turbo-Hydramatic or Turbo Hydra-Matic is the registered tradename for a family of automatic transmissions developed and produced by General Motors. If you need a rebuild kit or parts for your TH400 rebuild please see our store or ask us we will be glad to accomodate all of your part needs.3-speed longitudinal automatic transmission Final Transmission Assembly Process, Detent Solenoid Electrical Schematics, 88 and Later, Bushing removal and Replacement, Torque Specifications, Identification Tag Location and Information, Special Tools Required. Valve Versus Pump Cover Identification, Case Bottom Passage Identification, Spacer Plate Passage Identification, Valve Body Passage Identification, 6 Ball Case Checkball Locations, 7 Ball Case Checkball Locations, Various Extension Housing Dimensions and Identification, Various Output Shaft Dimensions and Identification, Case and External Parts Exploded View, Internal Transmission Parts Exploded View, Oil Pump Assembly Exploded View, Valve body Assembly Exploded View, Transmission Disassembly, Component Rebuild: Transfer Case, Gear Train and Related Parts, Direct Clutch Housing, Forward Clutch Housing, Governor Assembly, Oil Pump Assembly, Valve Body Assembly. ![]() ![]() Start your rebuild out right with the information this manual provides it will guarantee a successful rebuild! This manual covers: Component Application Chart, Line Pressure Specifications and Tests, Trouble Shooting Charts, Case Pump Passage Identification, Variable Pitch Passage Identification, Late Pimp Passage Identification, Pump Compatibility Chart, P.R. It is extremely easy to follow and has useful illustrations. It is the manual all the shops use if you are planning on rebuilding your transmission yourself I would highly recommend owning one. This is a very well illustrated manual with valuable information on the tolerances that the TH400, requires. GM Chevrolet TH400 1964-ON Rebuild ATSG Tech Manual 78 pages Standard Paperback Book Design (not pocket guide) Start your rebuild here.
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