Transmission: It is the place where the different "gears" of the cars are located.
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There is a shaft that comes from the engine and then there is another one that comes out of it and goes to the wheels. Through a set of gears, it moves at different speeds even when the engine moves at just one constant speed, so it takes advantage of the engine's power. They may be manual or automatic.
After replacing the valve body, the vehicle only engages in drive when selecting all gears, including neutral. What am I missing here? Is there a reprogram procedure that I need to do.