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Unread 07-08-2013, 11:10 PM   #1
ball0616
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2013 Jku Gearing question

I need to update my profile but I have a 2013 JKU with 3" BDS lift, pintler beadlocks, and 35" falken wild peaks. Just had the gears swapped out with 4.88's and run around 3100 Rpms going 75 mph. My question is this bad for the engine? I like the power but the gears just seem to be too much.

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Unread 07-09-2013, 03:36 AM   #2
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Quote:
Originally Posted by ball0616 View Post
I need to update my profile but I have a 2013 JKU with 3" BDS lift, pintler beadlocks, and 35" falken wild peaks. Just had the gears swapped out with 4.88's and run around 3100 Rpms going 75 mph. My question is this bad for the engine? I like the power but the gears just seem to be too much.

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No should be fine. You gas mileage will suffer but your engine should be just fine.
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Unread 07-09-2013, 06:47 AM   #3
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Your engine redlines at almost 7000rpm. What are you worried about
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Unread 07-09-2013, 10:49 AM   #4
1222
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That is a lot of rpms to be cruising down the freeway with, who in the heck advised you to install those gears for a 2013 and 35s?
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Unread 07-09-2013, 10:57 AM   #5
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Quote:
Originally Posted by 1222
That is a lot of rpms to be cruising down the freeway with, who in the heck advised you to install those gears for a 2013 and 35s?
Sounds perfect to me
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Unread 07-09-2013, 11:16 AM   #6
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I think someone advised you wrong on your gear set, 4.88 would be good for a 3.8 but not a 3.6 unless you plan on going bigger tires soon
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Unread 07-09-2013, 11:16 AM   #7
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Sounds perfect to me
It would.
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Unread 07-09-2013, 11:25 AM   #8
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Quote:
Originally Posted by 1222

It would.
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Unread 07-09-2013, 11:41 AM   #9
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I would not have went past 4:56 with only 35" as the long term view if a DD on any 012+. If an off road toy sure. 4:88 is more a performance gearing for 35"s. 4:56 would have been spot on . 4:88 would lean to 37"s. but I would NOT even think about that with a D30 front unless this is a mall crawler.
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Unread 07-09-2013, 04:55 PM   #10
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OP, you're fine. I'd say you're about right but if you have to choose, I'd always have a bit too much gearing than not enough. Kind of the same thinking when driving a stick where I'd rather be a gear lower vs a gear higher. Revving slightly higher is always better than lugging your motor.

The Pentastar loves to rev and 3000 to 3500 rpm at freeway speeds is no problem. Your gas mileage may suffer slightly but the difference is minimal.

Not that you need it and especially with today's advanced oils and cleaner fuels, it's really not an issue but it was actually recommended to drive a gear lower on the freeway every once in a while to "blow out" the carbon buildup on your valves. Stay on top of your oil changes and enjoy your Jeep!
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Unread 07-23-2013, 03:03 PM   #11
ball0616
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Thanks for the responses. I originally planned on 4.56's but the tech said I would be happier with the lower gear. I do some crawling here and there but it just seems like a lot of RPM's for a DD.

I have no intentions on going to 37's so looks like I will just suffer some gas mileage, not that I bought a jeep for its GREAT gas mileage anyway.

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