Gear ratio is the number of times the driveshaft turns compared to the
number of times the rear wheels turn. 4:10 means the driveshaft turns 4.1
revolutions to every 1 the tire turns. The bigger the ratio the more power
to the rear. This gives better acceleration and pulling power. You pay for
that with less gas mileage.
The bigger the tire the more power it takes to turn it. While you do not
have to change the rear end ratio you will notice a decrease in acceleration
and if you tow you will notice a decrease in power with the larger tires.
Calhoun did not mean power as in horsepower. Calhoun forgot he was on such a
technically correct newsgroup and just used a generic term to describe the
effect of larger gears. (As per wasters dictionary: Power - a mechanical
advantage or effect) Semantics are a bitch sorry for any confusion. :-)
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