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Old 03-04-2011, 04:34 PM   #1
Join Date: Mar 2011
Location: Broomfield, CO
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Question New (used JK) how can I tell if gears are modified?

Hello all...newbie JK owner here....

Just got a used 07 Unlimited Sahara from a dealer and it is lifted with 33" tires (don't know what size lift) and I am thinking here, have the gears been modified? How could I tell if the gears have been changed or not? How can I tell the size of lift? Anyhow, just curious if there is a way to check if the gears have been changed.

Thanks and I am sure I will be checking this board often for ideas and answers!


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Old 03-04-2011, 05:24 PM   #2
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Location: northeast ohio
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Take a pic and post it up. We can tell by pics how much lift it has.

I doubt the gears were changed for 33's, but you'll have to jack the jeep up and count driveshaft rotations for every 1 tire revolution. Example: 4 turns is 4.10...almost 5 turns is 4.88...almost 4 turns is 3.73, get it? lol

Congrats and welcome to WF

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Old 03-04-2011, 09:24 PM   #3
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Location: Fair Hill, Maryland
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jks come stock with 32's, so 33's aren't going to make much of a difference.
there are gear ratio calculators all over the net. just google "gear ratio calculators". you'll need to know your metric tire specs, rpm at x mph and the transmission top gear ratio. this will get you damn close on the ratio you have.
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Old 03-08-2011, 07:38 PM   #4
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Location: Broomfield, CO
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Here is a pic of the new (used) JK I just bought. Tee tires area actually 35's and not 33's as I posted earlier.
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Old 03-08-2011, 07:41 PM   #5
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Good lookin' JK!! Rescue Green FTW!!
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Old 03-08-2011, 07:49 PM   #6
Join Date: Mar 2011
Location: Broomfield, CO
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Thanks....was looking for a couple of months..almost pulled the trigger on a "stock" JK, but saw this one with Body Armor front/rear bumper, swing gate, cage and basket with the Mickey Thompson 35's and couldn't add this stuff on the stock with what I paid for this. Plus it was the Rescue Green we wanted!
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Old 03-08-2011, 08:32 PM   #7
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I can't answer your question, but that is one sweet looking ride. Congrats!

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