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I am a newbie to jeeps always wanted. Is there a big difference between the 3.21 and 3.23 axle ratios? I will be picking up a 2015 this weekend and have seen both these ratios.
 

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How do you plan on using your new JK? the reason i ask is that most folks that buy a JK want bigger tires along with a lift after a few month of ownership. with a 3.21 gear set you will feel a power loss along with poor MPG, if you go that route. If you plan on keeping it stock then either gear set is fine, with those gears you'll see better MPG and more top end speeds at lower RPMS with stock sized tires.
 

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are you sure it was 3.21 and 3.23 if so they are almost identical in every aspect of performance. You will not notice a difference

usually people compare 3.21 to 3.73. in that case the difference is very noticeable.
 
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