Challenger TransBrake: What It Is and How to Use It
The TransBrake is one of the Challenger Demon's most talked-about features. Here's exactly how it works and what it does for ET.
What Is a TransBrake?
A TransBrake is a feature that simultaneously applies the forward and reverse clutch packs in an automatic transmission, locking the output shaft while allowing the engine to build RPM against a stationary drivetrain.
When the TransBrake release button is pressed, the reverse clutch disengages instantly — the car launches with full torque already built, no spool-up delay.
The Demon's TransBrake
Dodge engineered the TransBrake as standard equipment on the 2018 Challenger Demon and again on the 2023 Demon 170. It's controlled via the SRT Drag Mode interface in the Performance Pages app.
How to use it:
- Enter Drag mode via the UConnect screen
- Pull to the staging area
- With the brake pedal held, engage the TransBrake (button on the steering wheel)
- Build RPM to your launch RPM (the Demon uses 1,800–2,000 RPM for optimal results)
- Release the TransBrake button — the car launches instantly
What It Does for ET
The TransBrake dramatically improves 60-foot times by eliminating the converter spool-up phase that slows conventional automatic launches. The Demon's official 0–60 mph time of 2.3 seconds relies on the TransBrake for consistency.
Can You Add TransBrake to Other Challengers?
Not easily via software — the transmission requires hardware support (dedicated solenoid circuit). Some aftermarket transmission builders can add TransBrake functionality to built TorqueFlite units, but it's a significant modification for non-Demon cars.
TransBrake vs Line Lock
Line Lock: Uses the front brake hydraulics to hold the car at the line while spinning the rear tires for a burnout. Burns in the tires. Not a launch device.
TransBrake: A launch device — holds the car stationary while RPM builds, then releases for maximum acceleration. These are two separate systems with different purposes.
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