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Old 12-28-2012, 08:05 AM   #31
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did it make gas mileage worse..
I would guess that gas mileage with 4.88 gears would improve for in town driving, but the mileage would be the same or worse on the highway because of the higher rpms at highway speeds.

I had 4.10 gears, but I decided to get beefier axles with 4.56 gears. I'll pick up my JK with the new axles and gears this afternoon, so I'll find out how the new gears work shortly. The 4.10 gears were ok with 35" tires, but not optimal with the added weight from bumpers, sports cage, skids, sliders, winch, beadlocks, ect.

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Old 12-28-2012, 03:35 PM   #32
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Old 12-28-2012, 03:39 PM   #33
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3.73 & 35's with auto works for me. But thats on a 2013, i would think prior to 2012, a gear reduction would be a must! Personally i would look at the 4.88's.
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Old 12-28-2012, 03:41 PM   #34
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It's a 07 x
I also have an 07 X model. I run 35's (duratracs) I havent had any issues. I also live in colorado at high altitude im a little sluggish in the mountains but nothing to crazy. I also just wheeled this past saturday. It doesnt mean im not going to re-gear I have plans to do so and throw some lockers in also. I'm just saying you can do it and you will be fine.
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Old 12-28-2012, 03:42 PM   #35
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This thread

MTH thanks for point out the difference between should and need. I thought I was gona have to do that.

I run 3.07s with 33s. I suppose that is about equivalent to a pre pentagrail w/ 35s and 4.10 or a pentagrail w/35s and 3.73s.

You never NEED to regear, unless you can't reach highway speeds, and even then I wouldn't say "need".

You probably should, with your engine and transmission. I would go with 4.88s if you offroad or 4.56 if you don't. Also depends on the wheel tire combo, the type of driving you do, etc.

Carry on.
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Old 12-28-2012, 03:51 PM   #36
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The shop doing my lift said stock rubi gears have been reported to be better running 35's (compared to stock tires) and another guy working there mechanic turned front counter sales rep runs 37's/4.10/auto/2012 and isn't going to regear
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Old 12-28-2012, 06:49 PM   #37
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Exclamation

This I a topic that has been asked for years. I'm over 50 and on my third jeep. I have a 2010 2dr, I went to 5:13 gears. As most of us know we never stop adding to our jeeps, if you do you should same money and do it once so you never have to worry down the road about what you can or can not handle.
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Old 12-28-2012, 10:18 PM   #38
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This I a topic that has been asked for years. I'm over 50 and on my third jeep. I have a 2010 2dr, I went to 5:13 gears. As most of us know we never stop adding to our jeeps, if you do you should same money and do it once so you never have to worry down the road about what you can or can not handle.
Good point
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Old 12-28-2012, 10:27 PM   #39
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2012 auto 35" tires. Mileage in town 14.5 on the highway 15.8 but I live in Nebraska. It's flat real flat. With 4.88
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Old 12-28-2012, 10:56 PM   #40
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2013 JKU 6 speed with 3.21, 3" lift, 35's. I would like to regear. It's definitely retarded in 1st gear, and 6th gear. Noticeable, but not unbearable. I get decent mileage though. My suggestion, is get your tires, if you can live with it, don't worry about the gears. If its too painfully sluggish for you, regear!
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Old 01-02-2013, 05:11 PM   #41
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2012 auto 35" tires. Mileage in town 14.5 on the highway 15.8 but I live in Nebraska. It's flat real flat. With 4.88
Mileage seems low I have a 2012 auto 3.73 and 35's and get 17 average city/highway. 4.88 gears might have something to do with it although some guys have done this and mileage has gone up.
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Old 01-02-2013, 10:30 PM   #42
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I'm still tracking the mileage. The other day i was running all over town and was getting 15.5. It may take a couple more tanks of gas to really get an accurate read.

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