Gear ratio discrepancy question, build sheet vs dealer specs? - JeepForum.com
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post #1 of 6 Old 09-16-2020, 05:48 PM Thread Starter
DPayne1
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Gear ratio discrepancy question, build sheet vs dealer specs?

Looking at buying a 2014 Rubicon, the dealer specs show it as geared at 3.73, while the buildsheet is saying 4.10. Is there a way for me to check this? I'd assume the build sheet would be the accurate one, but I'd like to hear what the seasoned JK people have to say.

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post #2 of 6 Old 09-16-2020, 06:05 PM
Kruzin
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In '14 Rubicons came with 4.10s.
To check it, jack up the rear axle, put it in neutral, spin one tire and count how many times the driveshaft rotates.

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post #3 of 6 Old 09-16-2020, 06:15 PM
ronjenx
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Quote:
Originally Posted by Kruzin View Post
In '14 Rubicons came with 4.10s.
To check it, jack up the rear axle, put it in neutral, spin one tire and count how many times the driveshaft rotates.
The one tire will need to be spun 2 revolutions, while making sure the opposite tire doesn't turn at all. The number of drive shaft rotations will be the gear ratio.

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post #4 of 6 Old 09-17-2020, 11:09 AM
222Doc
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i have always been able to do it in one turn.

But i will add not all Jk Rubicons 2012 and up came with 4.1 if a auto. Stock rubicon was 3.73 with a W580. even with max tow. It was an option to go 4.1 though. My 12 is that way, max tow and 4.1. That aint saying much for a two door..

all manual rubicon will be 4.1. Reality in function. the w580 dont need 4.1s to run 32s. That would be over geared a bit at 4.1. But they sure did burn rubber. at the time was quickest jeep made, that as well aint saying much

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post #5 of 6 Old 09-17-2020, 11:55 AM
JoonHoss
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The build sheet should be correct, the dealer options are just typically general data for models in general but the build sheet would be for that specific vehicle???

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post #6 of 6 Old 09-17-2020, 04:36 PM
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Quote:
Originally Posted by 222Doc View Post
i have always been able to do it in one turn.
One turn works, if both wheels turn exactly together.

When you turn one wheel one turn, you would have to X2 the drive shaft rotations for the number to be the gear ratio.

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