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Manual trans speedo gears



Does anyone know what color speedo driven gear that I should use with a 3:73 axle ratio. 4 speed manual BW T-10 trans. 68 Corvette. Has a gear in it now that is for a 3:08 axle.
Gotta have the tire size to do much with this question.
The car has P225R15 Comp TA's on it right now but the original tires were H70 x 15 Bias belted

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