Stock gears?

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Nov 2, 2012 | 04:37 AM

856kid

Thread Starter

JK Newbie

Joined: Jul 2012

Posts: 94

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From: Nj

Stock gears?

I have a 2008 jku Sahara. I do I find out what gear ratio I have?

Nov 2, 2012 | 06:02 AM

TCJK11

JK Enthusiast

Joined: Jul 2011

Posts: 126

Likes: 1

From: Shawnee, OK

On your build sheet. You either have 3.21, 3.73 or 4.10.

Nov 2, 2012 | 08:09 AM

blue project

JK Super Freak

Joined: Jan 2011

Posts: 1,531

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From: Cape Cod

Not always but most likely, auto trans you have 3.73, standard you have 3.21 and Rubicon 4.10

Nov 2, 2012 | 08:39 AM

ronjenx

JK Jedi Master

Joined: Feb 2008

Posts: 12,907

Likes: 185

From: Maine

Quote:

Originally Posted by 856kid

I have a 2008 jku Sahara. I do I find out what gear ratio I have?

Your automatic transmission would have come with 3.73 gears in the axles.

But you can always jack a tire, spin it two revolutions and count the drive shaft turns. That number will be your axle ratio.

Last edited by ronjenx; Nov 2, 2012 at 08:41 AM. Reason: spelling

Nov 2, 2012 | 08:46 AM

rays0852

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Joined: Dec 2011

Posts: 823

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From: Seminole, FL

I have a 2012...not sure if they changed since earlier models, but my auto came standard with 3.21s.....3.73 and 4.10s are optional.

Nov 2, 2012 | 08:48 AM

ronjenx

JK Jedi Master

Joined: Feb 2008

Posts: 12,907

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From: Maine

Quote:

Originally Posted by rays0852

I have a 2012...not sure if they changed since earlier models, but my auto came standard with 3.21s.....3.73 and 4.10s are optional.

When they went to the 3.6/5 speed auto, the stock gear combinations changed.

Nov 2, 2012 | 09:18 AM

PatrickESJK

JK Freak

Joined: Feb 2011

Posts: 853

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From: Melfa

I have the 3.73, which seems middle of the road. Is that a solid gear for motoring in the sand and mud with 35's on a 2.5 lift? I currently have 31 but havent made my mind up on the 33 or 35 inche tires.

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Nov 2, 2012 | 11:12 AM

wvudave

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Joined: Aug 2012

Posts: 44

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From: maryland

I have 35s on my jk with only 3.21 and its well under power im in the processes of going with 4.10 that should bring me back to stock hp...hopefully. but go with 35s!!!

Nov 2, 2012 | 04:09 PM

a4x4high

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Joined: Mar 2012

Posts: 176

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From: thornton ,co.

Quote:

Originally Posted by wvudave

I have 35s on my jk with only 3.21 and its well under power im in the processes of going with 4.10 that should bring me back to stock hp...hopefully. but go with 35s!!!

I would go atleast 4.56 . I just went from 3.21 to 4.56 i am very happy with the rpm range it runs and power increase was really good . Eventually i am goin to super charge so i will have good rpm range and even more power . I have an 07 jku .