a tranny wont make your car faster, it will jsut make you shift diffrent, the only way to make a car faster is to either, add more hp, torque, or lighten the load.
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Driving definitions: Understeer is when you hit the wall with the front of the car and Oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and Torque is how far you take the wall with you.