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hey etla, no race car uses a stock transmission. According to Sport Compact Car, the tranny is the most expensive piece on the car, because a typical race is about 2,000 shifts. They use sequential, custom cut dog gears like every wrc rally car. They swap out the transmission quickly because that is what they are trained to do. Look at Audi in Lemans racing. The entire back end of car is held in place with a few bolts. If they want to replace the brake rotors, they drop out everything from the transmission back, because it is all attached. The suspension is bolted to the tranny case, and the tranny is the main support for the rear of the car.
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