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there's a chart in a few threads... a search for "2012 gear chart" found me this one: http://www.jkowners.com/forum/showpost.php?p=978109&postcount=12

basically, 4.10s will be live-able depending on the weight of the tires and extras on the rig, but 4.56 would be a better bet if you're regearing from 3.21 (not in a Rubicon, of course) or 3.73.
 

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I'm running 5.13s with 37s on a 2 door and love it. Mines a 6 speed its almost to low of gears though because I'm turning around 2500 rpms at 60mph. I'm planning on going to 38s-40 in the future though so it will work out good.

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I have an auto '12 on 35s with 4.88s. For a DD, I'd say 4.88 is slightly too low for 35s. However, 37s were in the plans from the start and will be on within another month or so and I think it'll be perfect.
 
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