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GM Turbo 400 Transbrake Drag Racing TH400 Transbrake Valve Body JW Performance 30550-BR and 30551-BR

A JW Performance TH400 trans brake valve body installed in your Turbo 400 transmission gives you the option of drag racing in the electronics classes. In addition to providing the hard hitting launches that trans brake equipped turbo 400 transmissions are known for, many racers find improved consistency in ETs using this combination.

If you would like a further definition of what a TH400 trans brake is and how it works, please click here.

JW Performance Transmissions, Inc. builds some of the best quality, quickest releasing, turbo 400 transbrake valve bodies on the market. We offer their entire line of dependable, hard hitting transmission brakes. When using electronics like a delay box, you make the best use of them by using the delay box with a trans brake.


JW Performance Transmission Turbo 400 Trans Brake Valve Body Kit

JW Performance Transmission Turbo 350 Transbrake Logo


Automatic Transmission Brand and Model Transbrake Type Part Number

GM Turbo 400 TH400 Transbrake

Reverse pattern

jw 30550br


Reverse pattern all new aluminum valve body brake, faster release, quicker reaction times

jw 30551br


This is a complete replacement transbrake valve body. This valve body is installed in place of the original stock valve body.


Q: What is a TH 400 trans brake ? How does a Turbo 400 transbrake work?

A) An automatic transmission transbrake is a modified or aftermarket valve body which puts the trans into first gear, and reverse gear at the same time. As long as power is supplied to the valve body the vehicle will not move. This allows the engine to be brought up to a higher rpm than what is possible when "foot brake" racing. When the brake is engaged, there is no torque being applied to the driveshaft, so the suspension is also in an unloaded state. When current is removed from the brake, the reverse component of the trans is released, and torque is applied to the driveshaft very abruptly. This "hits" the tires harder, more like what a manual transmission car does when the clutch is released. Since the transbrake is controlled by applying an electrical current, it is also the preferred method of controlling when the car launches when using delay boxes and other modern drag race electronics.

A Turbo 400 equipped with a transmission brake can be used in a street vehicle, but is most commonly used for serious drag racing.



JW Performance Trans Brake Valve Body Index | Powerglide Transbrake | Turbo 350 Brake | Turbo 400 Trans Brake | C4 Transbrake | C6 Transbrake | 727 Torqueflite Trans Brake | 904 998 999 Torqueflite Transbrake | JW Performance Transmissions Catalog Index | Automatic Transmission Adjustment, Tips and FAQ |



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