A trans brake is built into your trans valvebody and will allow your torque converter to stall higher than using your cars brakes. As you increase the RPM, your car will start to creep forward if you use the cars brakes. The trans brake will hold the car.
The stall is the amount of slippage that your torque converter has built into it. You do not want the stall to be any higher than the RPM at which your maximum torque occurs. It's preferable to be around 500 RPM less than the RPM at which your maximum torque occurs.
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