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Old 10-31-2011 | 03:25 PM
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TRXRACER99
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Originally Posted by Jonesy112
for a 21.5 motor, you will want to run around a 4.0 FDR. the internal ratio is 2.0, so you will want around a 96t spur and 48t pinion. That will be a good starting point for you
looking at a 3.6-4.0 gear ratio
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