Cons of regearing - JeepForum.com

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post #1 of 20 Old 09-05-2012, 12:11 PM Thread Starter
12Htownsahara
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Cons of regearing

I'm considering pulling the trigger on some gears 5.13 to be exact. Just wondering of there are any cons in regearing. I have a 2012 JKU auto tranny. Will my gas mileage Increase or decrease? I know they will help my engine run under less strain just curious about downfall of regearing if there is any. My JK is 90% highway for now. 3 months 6200 miles.


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post #2 of 20 Old 09-05-2012, 12:40 PM
MudDuck99
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With no lift or bigger wheels and/or tires, and and you driving 90% highway ; it really wouldn't make sense. It doesn't seem like it would be worth the money. 5.13s on the highway will definitely give you worse mpgs
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post #3 of 20 Old 09-05-2012, 12:48 PM Thread Starter
12Htownsahara
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Im sorry I have a 3.5 inch lift with some 35 inch Nitto trails

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post #4 of 20 Old 09-05-2012, 02:37 PM
DrHolliday
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Quote:
Originally Posted by 12Htownsahara
Im sorry I have a 3.5 inch lift with some 35 inch Nitto trails
4.10's are pretty good for the 2012 auto and 35's. 4.56 would be better. Anything higher would be too much gear imo.

2011 JK Rubicon 2 door 6-speed manual, 3.5" Rock Krawler Suspension lift, 1.25" Daystar body lift, 40x13.50R17 Nitto Mud Grapplers


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post #5 of 20 Old 09-05-2012, 02:44 PM
SubAtomicGenius
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Cons of regearing to the right gear range? None. Regearing deeper than required? High RPMs on highway and loss of mileage.
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post #6 of 20 Old 09-05-2012, 03:01 PM Thread Starter
12Htownsahara
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So maybe 4.88s would be better. I don't wanna run over 3 grand doing 70-75. I just want to stop lugging my tranny and hunting for OD.

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post #7 of 20 Old 09-05-2012, 03:02 PM
perryhooah
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yeah, like he said... you need to know where you wanna go before you do it, and if you install the correct ratio, you will be great, but if not, too low OR too high, things could suck pretty bad

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post #8 of 20 Old 09-05-2012, 03:28 PM
Vince1
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Few have ever regretted going 5.13 with 35's on an automatic.
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post #9 of 20 Old 09-05-2012, 03:34 PM Thread Starter
12Htownsahara
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Like I said I drive mine on the hwy everyday. 2000 miles a month. I want to regain my stock power and and stop OD hunting.

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post #10 of 20 Old 09-05-2012, 04:07 PM
DrHolliday
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Quote:
Originally Posted by Vince1 View Post
Few have ever regretted going 5.13 with 35's on an automatic.
On 07-11 correct, the 2012 has completely different gearing. Its more like the 07-11 manuals as far as over drive is concerned.

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post #11 of 20 Old 09-05-2012, 04:13 PM
Spank
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4.56 seems to be the sweet spot on the 2012+ models with 35's.

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post #12 of 20 Old 09-05-2012, 05:08 PM
gwar11d2
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Looks like 4:1 or 4:56 would put you in a nice spot. The 5:13's you posted first would be good for 2007-2011, but you have a 2012 so here is what the gear chart says. These are RPM's at 70MPH, Green - Good balance, Yellow - Sluggish or flat roads - Blue - rock crawling, a lot of towing, etc


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post #13 of 20 Old 09-05-2012, 08:26 PM
cdj588
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When I drove the 2012 4door with the 255/75/17 wheels and 5 spd auto and the 3.73's the rpms were right at 3000 at 70. Seems like this chart is wrong or Im missing some information cause 255/75/17 is a 32inch overall wheel
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post #14 of 20 Old 09-05-2012, 09:25 PM
Brightwhite
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From all of the research i have done I am torn between 4:56 and 4:88 on my '12 auto. The 4:56's seem to be plenty for even up to 37's (the largest I could ever see going). That's what I am leaning towards.

I drive like you. To and from the airport every week and around town. Then the occasional weekend run up to the mountains.
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post #15 of 20 Old 09-05-2012, 10:00 PM
tjkj2002
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Quote:
Originally Posted by Brightwhite View Post
From all of the research i have done I am torn between 4:56 and 4:88 on my '12 auto. The 4:56's seem to be plenty for even up to 37's (the largest I could ever see going). That's what I am leaning towards.

I drive like you. To and from the airport every week and around town. Then the occasional weekend run up to the mountains.
Going the next lower gear set will help for city driving and let's face it driving a Jeep on 35"+ tires at 75mph+ can be scary and sometimes unsafe.Plus going one set lower will help overcome the added weight of the tires and any armor while just going back to the "stock zone" you still have mpg and performance loss due to the added weight but drastically better then the stock gears ratio with the big tires.Higher engine rpm's does not mean less mpg's or reduced engine life.


When I was researching what gear ratio to regear to everything said 4.88's would get me back in the stock range so I went with 5.13's since I do alot more city driving.After all was said and done I wished I went with 5.38's.

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