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Old 12-30-2012, 07:55 PM   #61
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14 mpg...hmmmm...

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Old 12-30-2012, 08:01 PM   #62
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Originally Posted by mflint1513 View Post
14 mpg...hmmmm...
Haha realy

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Old 12-30-2012, 08:13 PM   #63
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Yeah...good mix of highway and around town. Highway speeds around 70-80. Maybe I need to slow down a bit!
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Old 12-30-2012, 08:21 PM   #64
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I get that good and better and I drive then piss out of my 3.8
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Old 12-30-2012, 08:23 PM   #65
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2012 JKU. 35" tires. I went 4.88 also ARB lockers and Chromoly axels. The dealer did the work for me. The 4.88 just rock. I mean really rock! But I did get a vibration from the front drive shaft because of the higher RPM's.
So they put on a new drive shaft under warranty. So far they have been Honoring the warranty but i'm Sure that wont last forever and thats ok. i wanted a new jeep. i wanted it built the way i wanted and i was not going to wait 100 thousand miles for the warranty to expire. if it breaks I'll fix it thats part of running a off road rig. Its not my daily driving vehicle its my toy. I'm still tracking my gas mileage. Had a lot of in town running around today.
And was averaging 15.6 MPG.
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Old 12-30-2012, 09:33 PM   #66
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I just regeared to 4.56 as well in a 2012 Sahara running 35s. Took a little time to decide between that and the 4.88 gears but was explained the 3.6 in the 12's already had more horsepower so the 4.56 was perfect. Because I'm running 35s I went ahead and upgraded with new axles & carrier and chose the Tera44 (great decision btw) and through in lockers while I was at it. I spend most weekends on the trails and the rest of the time on the highway putting an average of 2k miles a month on my girl. Enjoy your gears I believe you made the right decision
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Old 01-02-2013, 05:31 PM   #67
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Originally Posted by Savora View Post
I just regeared to 4.56 as well in a 2012 Sahara running 35s. Took a little time to decide between that and the 4.88 gears but was explained the 3.6 in the 12's already had more horsepower so the 4.56 was perfect. Because I'm running 35s I went ahead and upgraded with new axles & carrier and chose the Tera44 (great decision btw) and through in lockers while I was at it. I spend most weekends on the trails and the rest of the time on the highway putting an average of 2k miles a month on my girl. Enjoy your gears I believe you made the right decision
If my JK was not a daily driver with highway commuting, I might have gone with 4.88 gears, but I couldn't justify the higher rpms on the highway.

I'm happy with the 4.56 gears. With my 35" tires and 4.56 gears or even with 37" tires and 4.56 gears, my rpms are higher than they were with stock gearing and stock 32" tires, so I have room to grow from my 35's to 37's if I choose too. I don't know that I'll ever go larger than a 37" or 38" tire on a daily commuter because the tires get too expensive for me to justify driving on them for work every day. Since I have the 4:1 transfer case, offroad crawling is not an issue either with the 4.56 gears.
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Old 02-01-2013, 09:06 AM   #68
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I have a 13' as well but have the auto. It's sitting on 35's and looking at the gear charts i was thinking 4.56 too. Thoughts comparing the auto vs manual
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Old 02-01-2013, 10:32 AM   #69
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Quote:
Originally Posted by WXman
Yes, for example: Your driveshafts are spin balanced to about 4,000 RPMs at the factory. Once you put those 4.88s in the differentials, suddenly that driveshaft is spinning WAY faster. Perhaps you get a vibration, or perhaps your CV joints go out, or perhaps it wears out the bearings in your T-case. Well, if they find out you did a gear swap, they have every right to deny coverage on everything else because now your entire drivetrain is out of factory spec. That's what I ran into.

As somebody else said...there may be some dealers that would be cool about it and help you out. Just know what the possibilities are before laying down $1,500 for gears.
Speak with your dealer and find out what they say. The dealer I go to says they lift their own Jeeps and say Jeeps are meant to be lifted and have bigger tires on them. They said they wouldn't deny warranty based on tires and lift. One tech even said look- there's my Jeep. It has 35's, at least a 3" lift and tons of add ons. The most modded Jeep in the lot (a different one) is one of the techs too!
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Old 02-01-2013, 12:34 PM   #70
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Originally Posted by wimcle View Post
4.56 and 35s , will have you at 2600rpm at 70mph... I consider that to be just about right.
This is 5th gear in a '13 with 35" tires and 3.73's.

Why don't you just leave it in 5th?


I don't know that I could justify the expense of re-gearing. I don't tow anything more than a few miles, and certainly not very often. I do wish that I had a little more torque in 6th gear, but I just downshift a little more often. (Hey, thats why I spec'd a manual in the first place!)

I don't think the power loss is very substantial at all for 35's, and the only reason for me to consider would be for a gain in MPG.
Which:
a.) Is not going to be enough to offset the cost of regearing, in fact would probably reduce MPG
b.) And I can get the same pulling power in 5th with the stock setup
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Old 04-30-2013, 08:06 PM   #71
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