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Trans Brake Kits | JW Performance Transmission Brakes


The trans brake revolutionized drag racing automatic transmission equipped vehicles. A transmission brake allows your vehicle to launch off the line with more "hit" to the suspension and tires. If you want the hard hitting initial move off the starting line like what you get by dumping the clutch on a manual transmission, but with the ease of use of an automatic transmission then an automatic transmission brake valve body is what you need. If you would like a further definition of what a transbrake is and how it works, please click here.

If you are looking for a manual shift valve body but do not want a trans brake, please view our manual valve body products here.

JW Performance Transmissions, Inc. builds the best quality transbrake valve bodies available. 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 Trans Brake Applications

JW Performance Transmission Transbrake Logo


Automatic Transmission Brand and Model Transbrake Type Part Number

GM Powerglide Transbrake

GM = Buick, Chevy, Chevrolet, GM, General Motors, Oldsmobile, Pontiac OEM model power glide transmissions, JW Performance and other aftermarket GM based transmissions

PRO TREE Forward pattern quickest launches .400 tree

jw 10284


Bracket Race Forward pattern .500 tree

jw 10280bf


Bracket Race Reverse pattern .500 tree

jw 10281br


GM Turbo 350 TH350 Trans brake

Reverse pattern

jw 20550br


GM Turbo 400 TH400 Transbrake

Reverse pattern

jw 30550br


Reverse pattern aluminum

jw 30551br


Ford Mercury C4 Transbrake

Reverse pattern

jw 40550br


Ford Mercury C6 Transmission brake

Reverse pattern

jw 60550br


Mopar 727 Torqueflite Transbrake

Reverse pattern

jw 50550br


Mopar 904 998 999 Torqueflite Trans brake

Reverse pattern

jw 55550br



JW Performance Transmissions Online Catalog Index Page

Automatic Transmission Adjustment, Tips and FAQ


Q: What is a trans brake? How does a 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. This is done in part by applying electrical voltage and current to the valve body assembly. 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 transmission brake can be used in a street vehicle, but is most commonly used for serious drag racing.



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