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Old 07-07-2014, 11:04 PM   #1
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Gearing options

As I'm building my jeep up I'm trying to do me best to keep it as balanced as I can between on and off road. I plan on running no more than 35" tires. With that in mind I'm trying to decide on gearing. I don't think I need to go to 5.13's thinking maybe 4.88's. I'm putting the RK 2.5 Max travel this weekend. Any thoughts?

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Old 07-07-2014, 11:13 PM   #2
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What year JK?

2007-2011, 4.88 would be the sweet spot for 35's.
2012+ 4.56 would be the sweet spot for 35's.

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Old 07-07-2014, 11:30 PM   #3
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In my opinion

2007-2011 w/ auto 5.13 for 35's. Manual 4.88
2012+ I concur

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Old 07-08-2014, 12:41 AM   #4
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Thanks

My JK is. 2014 Automatic. I was thinking 4.56 as well but just wanted to put the 4.88 option out there
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Old 07-08-2014, 03:13 AM   #5
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The general consensus is that 4.56 is the best balance for 35s + 3.6 engine. 4.88s will just give a slight bias towards performance instead of balance with fuel economy.
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Old 07-08-2014, 09:13 AM   #6
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Yea 4.88 wouldnt be bad and if you ever decide to go to 37's you will be set. 5.13 would be WAY WAY overkill and maybe fun for the first 100 miles, but would get old really quickly after that.
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Old 07-08-2014, 09:19 AM   #7
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There are some good charts online. Google 3.6l pentastar gearing chart. You'll find power curves and rpm ranges at set speeds with tire sizes and etc. There is a good video on YouTube a guy does to compare 3.73's vs. 4.88's shows the rev differences and RPM's. pretty cool. Im going with 4.88's myself because I pull a 3,000# trailer. But like others have said...if the 37'' tire bug bites you you'll be ok with 4.88's. Plus they're generally a little bit cheaper than 4.56's.
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Old 07-08-2014, 10:03 AM   #8
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I dont mean to hijack, but this is something I have been looking at for awhile too. Is one brand better than the others? Thanks
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Old 07-08-2014, 10:15 AM   #9
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Yukon's are considered by a lot to be one of the best out there right now. Revolution Gear and Axle is a "new" company that was started out of the ashes of Superior by the guy that used to run Superior which was VERY highly liked, but went out of business. I am probably going to run their stuff in my JK.
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Old 07-08-2014, 04:26 PM   #10
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I use (and sell) Yukon, G2, Alloy USA, Motive and Richmond. They are all quality.

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