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Old 03-14-2012, 04:59 PM   #1
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4.56 Gears on 4 cyl how to tell

I just got through installing a ford 8.8 which was re-geared to 4.56 from east coast gear supply. My front is stock so I removed the driveshaft. I really dont notice any difference at all with the regear. I also have not driven my jeep for over 6 months so may have lost the feel. How can I tell for sure if I have 4.56 gears?

in first gear I get up to 15 and approximatley 3000rpm before shifting into 2nd, and havent taken it out on the highway yet. I also have 33x12.5" tires

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Old 03-14-2012, 05:14 PM   #2
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Jack up the rear diff. Turn the wheel one revolution and count the number of revolutions the drive shaft makes. It should be about 4.5 for the drive shaft for each wheel.

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Old 03-14-2012, 05:24 PM   #3
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Originally Posted by Atthehop View Post
Jack up the rear diff. Turn the wheel one revolution and count the number of revolutions the drive shaft makes. It should be about 4.5 for the drive shaft for each wheel.
You can tape a piece of string to the axle for a reference guide to count the wraps (revolutions).
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Old 03-14-2012, 05:28 PM   #4
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I've never heard of anyone choosing 4.56's when regearing a 4 banger.. interesting
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