Way to check the rear end gear ratio........... - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-18-2007, 08:24 AM
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Way to check the rear end gear ratio...........

My dad told me a way he has checked rear end ratios - put the rear of the car on jackstands, put it in neutral, mark the tire and driveshaft. Then watch the driveshaft while making 1 full rotation of the tire. I did this, and my driveshaft went around 1.7 times (couldn't be a 1.7 rear end......) Am I missing something? Am I supposed to multiply that number by 2 (would make a 3.42, makes more sense). Please let me know....

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Old 06-18-2007, 10:22 AM
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That method should get you close. You may need to have someone hold the other tire as well.
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Old 06-18-2007, 11:13 AM
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Posi ii one turn of the wheel.


Non posi "open rear" is: Leave one tire on the ground, rotate the other with chalk marks on driveshaft & tire. Turn the wheel 2 turns. Count the turns on driveshaft.
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Old 06-19-2007, 12:51 AM
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If you checked with both wheels off the ground, the wheel on the far side might have turned while you couldn't see it, and thrown your result off. Do it like F&J said.

Your dad's way is correct for a posi rear end.
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Old 06-19-2007, 08:25 AM
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It takes a little longer, but, for more accuracy, turn the wheel 20 times.
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