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Old 11-08-2013, 05:04 PM   #31
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I want to regear for Christmas!!!

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Old 11-08-2013, 05:17 PM   #32
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Factory:
3.73. Auto. 2 door. 2011 (3.8L). Open differentials.

Now:
5.13 (Yukon) 35x12.50 15 KM2's

My wife actually thought something was wrong with the Jeep with the stock gears and 32" Rubi takeoffs, so it was easy for me to justify the work at only 1100 miles.

If I had it to do again with the 35's I would run a set of 5.38's

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2011 JK- 2.5" TF coil lift, Bilstein 5100 shocks, JKS Quicker Disco sway links, TF Adj Lower Control Arms, Auto w/ 5.13 Yukon gears, 35" KM2's on 15" MB 72's, Axle gusset kit, Body Armor rear bumper and tire carrier, SB M.O.D front bumper and sliders, s.P.O.D, 9000lb Quadratec Winch, Trimmed Flares, Crown Ext. brake lines
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Old 11-08-2013, 05:19 PM   #33
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Mine is a 2013 Rubi 5 speed auto with 35's and 4.56's. I think its a pretty good compromise. I run 65 on the freeway and get 21 mpg at 2500 rpm. Around town it drops to 15.

My buddy Daves 2010 Rubi 4 speed auto has 35's and 5.13's he cruises at about the same rpm and gets about 17 to 18 out of it and 13 around town. It is a climbing fool on the rocks and does OK for a 5000 pound box with only 200 hp.
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Old 11-08-2013, 05:26 PM   #34
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Anyone running 35s and 4.88 gears with an automatic on the 3.6L? I'm at a quandry whether to go with 4.56 or 4.88 gears. I do a lot of highway driving. Currently have 35" MTRs (measure 34") with 4.10s. I'm really not thrilled with the performance of the 4.10/35" tire combo. Jeep is kinda sluggish (to me anyway).
2012 auto I have 4.88 Gears. But I run two sets of tires and wheels 1 set is 35" I use when I I'm rock crawling that way I have more low end power and I always have a great set of tires for wheeling. I run 37" for everyday use.
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Old 11-08-2013, 05:47 PM   #35
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2012 auto I have 4.88 Gears. But I run two sets of tires and wheels 1 set is 35" I use when I I'm rock crawling that way I have more low end power and I always have a great set of tires for wheeling. I run 37" for everyday use.
Thanks for the information. Do you drive to the trails? In the experience you have with 35s and 4.88 does it seem like too much gear for a DD?

I suspect I'll move to a 37 at some point ... that's just how this jeep affliction works. It just won't happen in the near term.
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Old 11-15-2013, 03:16 PM   #36
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2012 JKUR, 4.10, MANual (lol), 315/70/17 American made Goodyear duratracs (replaced stockers at 20,000K). American made: Heavy bumpers, winch, aluminum sliders, gusseted/sleeved, blah blah, etc

MPG 15-21 depending on skinny pedal pressure

Regear to 4.56 Monday/Tuesday and teraflex diff covers. Can't wait. I held off way too long is all I can hope to say Tuesday!!!

MPG to come
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Old 11-15-2013, 03:26 PM   #37
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Just remember you're supposed to break in new gears for 500 miles or so... I was told nothing over 65 MPH- so your MPG might be skewed until after the break-in period. When you can skinny pedal it.
Of course some say break-in is not necessary...
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Old 11-15-2013, 03:41 PM   #38
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I just did a test from 0 to 100. I timed it from a dead stop on a dry lake bed. With the stock auto, 3.73 and 32 tires it took 44.5 seconds.. With the 4.56 gears and 35's and a 3.5 lift it took exactly 2.5 seconds less at 42 flat. My speedo was verified with GPS on both runs. I also have not seen a big difference in fuel economy at 21+ on the freeway at 65 mph. I did have to slow down from 70+ to get that though. So for me no loss of power or MPG worth mentioning.
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Old 11-15-2013, 04:09 PM   #39
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Just remember you're supposed to break in new gears for 500 miles or so... I was told nothing over 65 MPH- so your MPG might be skewed until after the break-in period. When you can skinny pedal it.
Of course some say break-in is not necessary...
Thanks for the reminder. Been there done that a few times. Probably gonna heat cycle them a few times too. Sucks no mountains/towing for 500

May as well just so it since I have the time and the patience. Didn't know about when you can skinny pedal it. What's that about?
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Old 11-15-2013, 04:11 PM   #40
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I just did a test from 0 to 100. I timed it from a dead stop on a dry lake bed. With the stock auto, 3.73 and 32 tires it took 44.5 seconds.. With the 4.56 gears and 35's and a 3.5 lift it took exactly 2.5 seconds less at 42 flat. My speedo was verified with GPS on both runs. I also have not seen a big difference in fuel economy at 21+ on the freeway at 65 mph. I did have to slow down from 70+ to get that though. So for me no loss of power or MPG worth mentioning.
Uum maybe it's the mobile device but I cannot see vehicle details (I checked in your profile too)?! Tires too? Thx
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Old 11-15-2013, 04:38 PM   #41
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Thanks for the reminder. Been there done that a few times. Probably gonna heat cycle them a few times too. Sucks no mountains/towing for 500

May as well just so it since I have the time and the patience. Didn't know about when you can skinny pedal it. What's that about?
Was just kidding. Meant don't thrash it/skinny pedal it right away.
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Old 11-15-2013, 04:39 PM   #42
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Uum maybe it's the mobile device but I cannot see vehicle details (I checked in your profile too)?! Tires too? Thx
Gunner's specs change daily.
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Old 11-15-2013, 05:02 PM   #43
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Was just kidding. Meant don't thrash it/skinny pedal it right away.
Aaaahh. You got me. Lol. Sounded counter productive but ya never know. Maybe you knew the latest and greatest in gear break-in.
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Old 11-15-2013, 05:03 PM   #44
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Gunner's specs change daily.
Yes. You can say that again. I thought I saw an 04 TJ is his profile but saw a JK in his avatar. Lol
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Old 11-18-2013, 12:18 PM   #45
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Dropped Jeep off for 4.56 gears. Super excited to break em in and feel the performance gains!
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Old 11-19-2013, 08:55 PM   #46
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Just picked it up and put about 15 miles on them so far. Initially (first few blocks) I thought, man I wish I would have geared to 4.88 instead of 4.56! After hitting the highway and driving on some back roads it feels really nice. More detailed updates once I get to drive outside of rush hour. Plus I'm letting the gears cool before heading out again.

Overall it feels amazing and spot on for 35's and the heavy weight of the JKUR.

WOW
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Old 11-20-2013, 12:00 AM   #47
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Just bought an 09X with Auto/5.13's and 35" MTRs. A little tough to drive at a consistent speed without cruise control, especially on the FWY. Pretty amazing combo with the cc on.

Question: if I go with a little smaller tire - 34" Toyo AT, or even a 33" Duratrac, what will happen? Higher RPM's but better mileage? I live in Tahoe, so a high elevation. Don't get me wrong, probably going with Duratrac's 315 because well, I like the look, especially with the flat fenders.
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Old 11-20-2013, 11:45 AM   #48
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The chart will give you an idea- but its just a chart. Real world numbers can vary a lot. I doubt you'd notice anything with a 34"- maybe a 33" DT???
You can also poke around here:
Tires & Wheels - Jeep Wrangler Forum
or here:
http://www.wranglerforum.com/f274/33...deo-96568.html
ESP has had every tire you can put on a Jeep- his thread.
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Old 11-20-2013, 12:56 PM   #49
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The kid has an '08 JKU. 35" Toyo MT's and 4.88s. With the 3.8L and 42RLE, it seems to be closer to the original power band with the stock tires. O/D is used as well.

Bob K.

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