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Best bet is to find a person with hptuners. Pay the man and driver him around until he gets the speedo correct
Posts by 05_quick4door
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if you have an open diff it will be hard to do
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If both are in the air one will typically spin backwards and the shaft won't spin at all. So when you put one tire on the ground and through the beauty of spider gears you have to spin it twice as far.
Spin the shaft and count wheel revolutions
Spin the shaft and count wheel revolutions
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Same goes the for burnouts. On the speedo a one wheel peel might indicate 60mph but that booger is going almost double
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