Rearend question
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Joined: Sep 2001
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Differential Gear Ratio Determination
This method was contributed by member: theonlybull
What I do, is jack one tire up, mark it, then mark the driveshaft. Now one person turns the one rear tire 20 times, and the other person counts the driveshaft rotations. Then divide the resulting turns of the driveshaft by 10. If you count 35, then you have 3.50 gears..
Doing it this way will let you tell the difference between 3.00, and 3.10 gears.
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If the truck is all original you can decode the rating plate info with the information found in the front of your repair manual. The axle will also have a tag on it with the ratio stamped on it.
This method was contributed by member: theonlybull
What I do, is jack one tire up, mark it, then mark the driveshaft. Now one person turns the one rear tire 20 times, and the other person counts the driveshaft rotations. Then divide the resulting turns of the driveshaft by 10. If you count 35, then you have 3.50 gears..
Doing it this way will let you tell the difference between 3.00, and 3.10 gears.
---------------------------------------------
If the truck is all original you can decode the rating plate info with the information found in the front of your repair manual. The axle will also have a tag on it with the ratio stamped on it.
Last edited by Torque1st; Oct 27, 2006 at 09:59 PM.
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Joined: Oct 2006
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Torque- I'll try that tomorrow when I have some time. Thats a pretty clever way. It will definatley tell the difference between 3.00 and 3.50. I'm not sure if its the original axle and there is no tag.
Last edited by '73 F100; Oct 28, 2006 at 10:07 PM.
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