Divide the number of teeth on the pinion by the teeth on the crown wheel and this gives the ratio : 1,Higher the number 4:1-5:1 more acceleration lower more top speed. We used to fit 4/5:1 in group 4 rally cars with LSD fitted.Point and squirt from corner to corner.
As Tilly say's you trade one against the other,swings and roundabouts.
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