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Old 01-08-2014, 11:28 PM   #1
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gears on 91 YJ

Bought my 91 YJ and I believe the previous owner had re geared the axle. Is there a formula I can do to find out what type of gears I have. speedometer is definitely way off.

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Old 01-08-2014, 11:44 PM   #2
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Jack up the jeep in the rear, make a reference mark on the rear tire side wall and down on the concrete. Make another mark on the drive shaft, and the axle housing . Slowly spin the rear tire exactly one revolution , while counting how many times the shaft turns. If the shaft makes just a little over four revolutions then the gear ratio is 4:10 if it makes just a little over three turns it would be 3:07 gears , so on and so fourth. Hope this helps.
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