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But seriously....
Gears are always changed in sets of two in order to change the ratio. Usually the easiest ratio to change is the final drive ratio, since OEMs usually have options for different transmission/engine combinations -- ring gear/pinion gear set. If you actually need to change a ratio inside the transmission, things get more difficult. Chances are the OEM will not have this available unless it is a very common tansmission used in a lot of cars. If they do, you may not be able to get exactly what you want because things may be so tight in the transmission that you may need to change two gearsets -- a higher numerical gear ratio requires a smaller pinion and a larger gear. In order to fit on the shaft centers, the sum of the teeth for the pinion and gear must always be equal. For example: If you have a 25T pinion and an 80T gear (Ratio = 3.20), the sum of your new gearset teeth must be 105T. That means that if you want a ratio of= 2.89, you need a 27T pinion and a 78T gear(assuming you have the space for the larger 27T pinion). Even if the OEM doesn't have this combination, you could always have it made custom-- not cheap.
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