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I jacked up the rear of the T and cranked the engine with the hand crank while my son counted one revolution of the rear wheel. I was in ford high and the Ruckstell lever forward (high). I turned the crank about 1.75 revolutions for one turn of the rear tire. This may not be the correct way to check the gear ratio. I know most manual transmissions are 1:1 in high gear (non overdrive). Can I use this info to figure the Ruckstell ratio? I'm including the Ruckstell serial number just in case that says anything.