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Originally Posted by 06_GT_Hawaii
How do you know the power's not getting to the tires because of the gears, but need help here undderstanding gears?
We'll need more info to help you, but help you we will...
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69' stang- the previous owner of the car left the stock gears in the rear end but built up the engine, i want to upgrade the gears to get the horses the motor is making to the rear wheels. it is a ford 9 in. i dont know the ratio of the current gears. a mechanic that is helping me on the project suggested 3.80 but i would like a second opinion