Trans Brake Solenoid GM TH-400

The Trans Brake Solenoid GM TH-400 is a purpose-built transmission control component engineered for high-performance and drag racing applications where precise engine braking and launch control are critical. Designed by Transmission Specialties, this solenoid serves racers and enthusiasts who demand repeatability and consistency during hard launches, particularly in vehicles equipped with the legendary TH-400 three-speed automatic transmission. Whether you're building a dedicated strip car or upgrading a street performance vehicle, this solenoid enables controlled engine hold and smooth power delivery off the line.

This transmission brake solenoid functions by momentarily applying hydraulic pressure to hold the transmission's output shaft stationary while the engine builds boost or RPM at the starting line, creating a load-free acceleration phase that reduces tire slip and improves launch traction. The solenoid's rapid response and durability are engineered to withstand repeated high-load cycles inherent to competitive driving, with robust construction rated for the demands of modified engines producing elevated torque figures. Compact dimensions of 7.3 x 3.6 x 7.4 inches allow flexible installation in tight engine bays, while the lightweight 1.78 lbs footprint minimizes impact on vehicle weight distribution—essential considerations in performance tuning.

Bracket racers, street/strip hybrid builders, and serious TH-400 enthusiasts benefit most from this solenoid's precision control, which pairs seamlessly with modern engine management systems and aftermarket transmission controllers. Installation requires integration with your transmission's hydraulic circuit and electrical system—professional installation is strongly recommended for optimal tuning and safety. The solenoid is compatible with GM TH-400 transmissions across a wide range of engine platforms, making it a versatile upgrade for Chevrolet, Pontiac, Oldsmobile, and Buick applications where trans brake functionality enhances launch consistency and performance.