Frequently Asked Questions
Transmission Lookup
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400,TH400,3L80
The Turbo Hydramatic 400 was first introduced for the 1964 model year under the name "Turbo Hydra-Matic" in Cadillacs and "Super Turbine" in Buicks. The following year, application expanded to Oldsmobile and Pontiac and to some full-sized Chevrolets. Many of the Buick, Cadillac, and Oldsmobile THM400s produced between 1964-67 were equipped with a Switch-Pitch Torque converter variable-pitch Stator (turbine), which is sought after by collectors and drag racers. These can be identified outside the vehicle (with the torque converter removed) by a narrow front pump spline. Externally the switch pitch version has two electrical connections, where the non-switch pitch THM400 has only one. 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, and Buick divisions between 1964-1967.
 TH400 Transmission Bands, High Performance and Stock
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 400,TH400,3L80,GM,Filters and Filter Kits
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 TH400,400,3L80,GM,Mega Combo Kits,Master Overhaul Kits,Banner kit(Less Steels),Overhaul Kits
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 400,TH400,3L80,Banner/Master Rebuid Kit(no steels)
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 TH400,400,3L80,GM,Gaskets,O-Rings,Sealing Rings and Kits
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 TH400,400,3L80,GM,Friction and Steel Modules, High Performance Power Packs and Clutch packs
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 TH400,400,3L80,High Performance,Aftermarket, and OE Valve correctioal kits
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 400,TH400,3L80,Accumulators,Servos,and Components
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 TH400,400,3L80,GM,Planetary Assemblies and kits
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 400,TH400,3L80,GM,Clutch Drums,Drum Assemblies and Kits
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 400,TH400,3L80,Solenoids,Electrical Components
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 TH400,400,3L80,GM,Sprags,One Way Clutches and Assembly Kits
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 400,TH400,3L80,GM,Bushings and Kits
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 400,TH400,3L80,Aftermarket Bearings and Bearing Kits
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 TH400,400,3L80,GM,Valve Body Assemblies
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 TH400,400,3L80,GM,Thrust Washers,Bearings,Shims and Kits
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 400/TH400/3L80,Snap Rings
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 TH400,400,3L80,GM,OE Stock,Hardened,Cryo-treated,Billet Shafts
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 400,TH400,3L80,Conversion Kits,Adapters,Mounts
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 400,TH400,3L80,Metal Clad Seals
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 TH400,400,3L80,GM,Technical Manuals,ATSG Books,Updates Videos
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 TH400,400,3L80,GM,Transmission Pans,Stock and Deep Pans
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 400,TH400,3L80,Flywheels,Flexplates,Dust Covers
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 400,TH400,3L80,Linkages and brackets
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 Governors
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 350,350C,Modulators
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 400,TH400,3L80,GM,Cases,Housings and Components
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 TH400,400,3L80,GM,Transmission Rebuild Tools,Problem Solvers
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Kit, Shift, Correction, With Plate, TH-400, GM (65-98)
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