You can't change individual gears in the transmission to a higher gear ratio. But to answer your question if you have a GTP already then you already have the highest gear ratio possible as far as MPG's go or crusing RPM's rather..
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You can't change individual gears in the transmission to a higher gear ratio. But to answer your question if you have a GTP already then you already have the highest gear ratio possible as far as MPG's go or crusing RPM's rather..
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