Gear box: 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.
When you drain your trans... keep about half of what you drain and mix it with newer fluid.
And in couple months do do it again..
It can sometimes NOT be good on a trans to have all new fluid bc of metal shavings in the old fluid that are needed to fill in imperfections in the trans
And in couple months do do it again..
It can sometimes NOT be good on a trans to have all new fluid bc of metal shavings in the old fluid that are needed to fill in imperfections in the trans