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Old 09-20-2012, 04:17 PM   #1
mdslngr09
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Default Gear advice

So I want to go from my 33's up to 35's maybe even to 37's. So my question is

4.88 or 4.56

I am running 3.73 now
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Old 09-20-2012, 05:17 PM   #2
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Might help to know a bit about your Jeep like year, engine, mods, daily driver or mostly off road, etc...
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Old 09-20-2012, 05:22 PM   #3
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Thanks I had to cut post short

I have a 09 JK Unlimited
3.8 with auto
Daily driven
Teraflex 2.5 coil
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Old 09-20-2012, 07:17 PM   #4
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4:56 in my opinion. You need to be able to pass at least one gas station.
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Old 09-20-2012, 07:52 PM   #5
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4.88 to 5.13,,, you want some passing power
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Old 09-20-2012, 08:03 PM   #6
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Mine has 4.10's turning 32" tires, and is plenty low geared, as offroad I just use low range in the transfer case as well. Mine is a '12 JK with manual trans. But low range, first gear is barely moving. On the road I just use Hi range, and even towing my boat or such, not its not heavy just 3,100 to 3,300 lbs depending on what is in the boat, but its a non-issue towing it, never wish for lower gearing. So I would think 4.56 gears would be plenty low enough, even if you did go up to 37's. But especially at 35's as that is effectively lower geared than mine with 32's and 4.10's.
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Old 09-20-2012, 08:08 PM   #7
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As AW12345 would say, go to this site and enter in all of yur info and it will tell you crawl speeds and highway speeds and RPM's.

http://www.grimmjeeper.com/gears.html
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Old 09-20-2012, 11:04 PM   #8
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Quote:
Originally Posted by mdslngr09 View Post
Thanks I had to cut post short

I have a 09 JK Unlimited
3.8 with auto
Daily driven
Teraflex 2.5 coil
5.13 is the ticket, unless it's a Rubicon, then you could try to shop for 5.38 gears
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Old 02-25-2013, 09:31 AM   #9
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4.56 for 35's......4.88 for 37's. unless you already feel like its under powered. Then I would go the next step up accordingly.
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Old 12-11-2016, 09:35 PM   #10
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Check out this gearing/rpm calculator.
http://www.4ws.com/gear-ratio-rpm-calculator
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