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Hi, the simple way to calculate is to put the rear wheels in the air turn the rear wheel one turn and count how many turns make the main driveshaft.
you will get your ratio.
Avner
No. Turn the wheel one complete revolution and count the driveshaft revolutions. The driveshaft revolution count is your ratio i.e. 3.08:1, 3.36:1, 3.55:1 etc.
