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GM Turbo Hydramatic 400

If you would like a specific recommendation from a TCI® product specialist based on your vehicle specs, click here.

The "new" GeeTO Tiger - TCI equipped.
TCI®-equipped GeeTO TIGER!

The Turbo Hydramatic 400, or Turbo 400, as it is more commonly known among racers and performance enthusiasts, made its debut in 1964 as the standard equipment transmission in big block-powered Cadillacs and other full size GM vehicles.

Almost from the moment it put in an appearance on the street, the Turbo 400 attained near-legendary status as one of the strongest automatic transmissions ever made. In addition to becoming the transmission of choice for serious drag racers, pulling trucks and other mega-horsepower big block enthusiasts, the Turbo 400 automatic found a home as standard equipment in some of the most powerful and exotic vehicles ever produced –from V12 Jaguars and Ferraris to Full Size Jeeps and military vehicles. Today, the THM 400 transmission is only installed as original equipment in certain military vehicles, but it remains a favorite among horsepower junkies everywhere in need of a brutally strong 3-speed automatic. Although Turbo 400s are already stout in stock form, a TCI® prepped Super StreetFighter™ or Competition Turbo 400 can handle over 600 normally aspirated horsepower.

Far from just being an industry-leading manufacturer of “ready-to-run” automatic transmissions and torque converters, TCI® also carries all of those hard to find transmission swap components that you’ve been looking for –mid mount engine plates, adapter plates, kickdown linkage brackets, shifter and TV cables, speedometer gears, shifters, and much, much more. All TCI® transmissions, torque converters, and valve bodies are triple-tested in our state-of-the-art manufacturing and research facility in order to ensure reliable performance before they ever see the inside of one of our shipping cartons, and our internal components are guaranteed to be the very best that money can buy. So check out TCI® for all of your Turbo 400 needs –that high powered big block under the hood of your street machine will thank you!

Turbo Hydramatic 400 Valve Bodies

The transmission valve body is the brain of the transmission. Often it is called the control valve. Valve bodies, like automatic transmissions themselves, have been changed and updated through the years. We select and use only the valve bodies that will provide you with the best performance and service. All TCI® valve bodies are 100% quality checked for proper function and, where applicable, proper operating pressures on a dedicated valve body test machine.

We offer three types of modified valve bodies for your Turbo 400:

StreetFighter® Series - Manual/Automatic
Our manual/automatic valve body is designed for the street and strip performance car owner. It is the same valve body used in our StreetFighter® transmission series.

Full Manual Series
Our competition valve body for maximum performance and quick elapsed times in a racing application. By controlling the valve body only through manual means we can produce quicker shift timing and are able to run higher line pressures than possible with an automatic shift transmission. Higher line pressure makes it harder for clutches to slip under high loads. Remember, with a full manual you will have to make every shift, for these units do not shift on their own. A great choice for bracket cars, monster trucks, and virtually any off-road competition vehicle where a Trans-Brake is either not legal or not desired.

Trans-Brake Series
Our Trans-Brake Series allows you to achieve maximum torque converter stall and provides for quicker and more consistent reaction times and 60 foot times. This is due to the Trans-Brake action which prevents an engine's torque load from being transmitted through the drive train prior to the launch. The Trans-Brake acts in much the same manner as a manual clutch. Once the Trans-Brake is engaged, the vehicle can neither roll forward nor backward and as you press on the accelerator the engine can rpm as high as the torque converter stall. Once the Trans-Brake is released, the power is transmitted immediately to the rear tires in much the same manner as a manual clutch but with the parts saving advantage of the torque converter's shock absorbing action.
Application StreetFighter® Series Full Manual Series Trans-Brake Series
GM TH400, 1965 & later 222400
221100 1
221500 1
1 Reverse shift pattern

 

TCI® Full Manual Valve Body With Engine Braking For Turbo 400  

Making the right shift at the right time is critical to getting the most performance from your transmission. The new TCI® TH400 Full Manual Shift Valve Body with Low Gear Engine Braking is the best way to deliver quick shift response times and clean neutral shifting. Best of all, the full engine braking in low gear is perfect for rock crawling and 4x4 applications where utilizing the engine’s compression drag to help traverse the most extreme terrains is a useful feature.

The TCI® TH400 Full Manual Valve Body with Low Gear Engine Braking is the perfect set-up not only for heavy off road usage, but is great for hot street/strip cars where a forward shift pattern valve body ensures reliable transmission gear selection. As with all TCI® valve bodies, installation is a simple bolt-in procedure for any GM TH400 transmission with all necessary parts included and performance is guaranteed due to the rigorous TCI® quality control standards.

 

Application Full Manual
Valve Body
With Engine
Braking
GM TH400, 1965 & later 221200

 

Replacement Trans Brake Solenoid For Turbo 400
TCI®’s replacement trans brake solenoid features a precision-ground steel shaft with bronze bushing, a shaft-pinned nut for secure placement and unique lip seal to prevent fluid leakage while minimizing mechanical drag. The conical-face design handles higher forces than standard flat-faced solenoids with its 0.250” stroke. The high-efficiency, precision wound coil maximizes the force delivered by the solenoid, and the two-wire set-up ensures a good quality ground. Fits TCI® Trans Brake Valve Body #321500.

Description Part No.
Replacement solenoid for TH400 trans-brake valve body #221500 221300

Trans-Brake Release Valves
Precision-manufactured direct replacement for TCI® trans brake valve bodies.

Description Part No.
Replacement release valve & spring for #221500 221400
Composite Metal Matrix release valve for #221500 221409
Pressure Regulator Spring, high pressure spring for TH400 full manual and Trans-Brake applications 224300
 
 
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