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Old 11-30-2013, 04:27 PM   #1
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JK regearing

Hello, i have 34" tires and a 3.6L auto, what is the most suitable gear ratio, milage is not an issue, I need power

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Old 11-30-2013, 04:32 PM   #2
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Check out this thread:

JK gear ratio chart

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Old 11-30-2013, 04:34 PM   #3
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Thanx
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Old 11-30-2013, 04:43 PM   #4
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Maybe this one will be better. Just realized the thread I posted was for the 3.8L.

Here's a post that has a 2012 chart which is the 3.6L.

3.6 vs. 3.8 gear charts
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Old 12-01-2013, 07:50 AM   #5
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Oh i noticed that too, thanx again 😃
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Old 12-01-2013, 10:59 AM   #6
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Depends... What are your mods, what is the biggest size tire you will ever run, long highway drives or just around town/city?! I have a manual 3.6, 315/70/17 duratracs. Made due with 4.10 gearing for a while, but swapped to 4.56 and it's awesome! I do have a lot of weight, and drive in the mountains from time to time and tow occasionally. With 4.10's I got 17-20 mpg, with the 4.56 I get 15-17 mpg. I should add that what I lost in mpg pales in comparison to what I got back in power. It's was sweet to be able to not downshift as much and the power is so much fun around town
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Old 12-01-2013, 11:05 AM   #7
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Depends... What are your mods, what is the biggest size tire you will ever run, long highway drives or just around town/city?! I have 315/70/17 duratracs. Made due with 4.10 gearing for a while, but swapped to 4.56 and it's awesome! I do have a lot of weight, and drive in the mountains from time to time and tow occasionally. With 4.10's I got 17-20 mpg, with the 4.56 I get 15-17 mpg. I should add that what I lost in mpg pales in comparison to what I got back in power. It's was sweet to be able to not downshift as much and the power is so much fun around town
What is a comfortable highway speed with the 4.56 gears? U have a 3.6 or 3.8?
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Old 12-01-2013, 11:11 AM   #8
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Hello, i have 34" tires and a 3.6L auto, what is the most suitable gear ratio, milage is not an issue, I need power
4.56 no doubt. If you never drive above 60 or 65, 4.88s will make the Jeep feel like it's supercharged. I'd go with 4.88s, especially if you have added weight (armor, bumpers, winch, etc.) If you find that it's a tad too high for you, just get larger tires.
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Old 12-01-2013, 12:40 PM   #9
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I'm running 35's with 488s. Love the combo, run 70 on the hwy and sometimes tow a pop up trailer.
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Old 12-01-2013, 01:21 PM   #10
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Anything below 35" tires- 4.56s. Above 35s- 4.88s. I am all about power, drive 75 avg. on the freeway and find 4.56s on 35s perfect. (Auto- lots of weight). Don't care about MPG. Neither the added crawl for rocks or more power would make me want 4.88s. There are hundreds of posts on this- use the search feature for even more opinions.
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Old 12-01-2013, 03:08 PM   #11
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What is a comfortable highway speed with the 4.56 gears? U have a 3.6 or 3.8?
It depends and since I haven't had them long and have been adjusting my speed constantly breaking them in, I can't comment on the sweet spot/speed. If I was to guess right now I'd say 65.

Give me more time and I can tell you more. Just passed 500 miles and about to change out from the conventional break in fluid to Amsoil synthetic tomorrow!

Also about to hand calc my mpg from a 4 hour trip yesterday from 5280 feet to 9,300 feet with 30 minutes of 4x4 HI AND LO mixed use to double check EVIC MPG readout and got the speedo dialed after trial and error with the procal and gps speedo apps

I fight an internal battle of wanting 37's and 4.88's. Although I love how street-able the Jeep is now with 315/70/17, 6 speed, 3.6, & 4.56.
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Old 12-01-2013, 04:55 PM   #12
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It depends and since I haven't had them long and have been adjusting my speed constantly breaking them in, I can't comment on the sweet spot/speed. If I was to guess right now I'd say 65.

Give me more time and I can tell you more. Just passed 500 miles and about to change out from the conventional break in fluid to Amsoil synthetic tomorrow!

Also about to hand calc my mpg from a 4 hour trip yesterday from 5280 feet to 9,300 feet with 30 minutes of 4x4 HI AND LO mixed use to double check EVIC MPG readout and got the speedo dialed after trial and error with the procal and gps speedo apps

I fight an internal battle of wanting 37's and 4.88's. Although I love how street-able the Jeep is now with 315/70/17, 6 speed, 3.6, & 4.56.
You live in Colorado dude...go big or go home. 37s all the way!
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Old 12-01-2013, 05:15 PM   #13
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Consider 4.88s

I have a JKU, 3.6, auto, Duratracs that are 34.4, and 4.56 gears. I can easily cruise at 75mph if I choose.

When I added the 4.56 gears, I had the soft top on and all of the above combo was spot on. However, I then put on my hard top and found that I lagged just a tad in the mountains where I live. I probably would go with 4.88 if I had to do it again. So with soft top, it's great, with the hard top, it's good.

My biggest reason for staying with the 4.56 was my 80+ mile round trip commute, so mpg does mean something to me. I lost about 1.5-2 mpg with the 4.56, but do not regret the gears at all!!

Hope this info helps! Good luck.
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Old 12-01-2013, 06:02 PM   #14
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You live in Colorado dude...go big or go home. 37s all the way!
Ha Yes, and since I've lived here 10 years I know exactly what I want
I don't run the hard trails anymore. Had my fill of that. I dig medium builds where it's extremely roadworthy and practical (don't misinterpret this or misconstrue it either- these are just my tastes).

37's are sweet but have plenty of drawbacks
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Old 12-01-2013, 06:03 PM   #15
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Ha Yes, and since I've lived here 10 years I know exactly what I want
I don't run the hard trails anymore. Had my fill of that. I dig medium builds where it's extremely roadworthy and practical (don't misinterpret this or misconstrue it either- these are just my tastes).

37's are sweet but have plenty of drawbacks
I keed I keed. Im actually quite happy with my rig with 35s. Looks, performance, etc. I also agree with you that most of the time, the medium/mild trails are the most scenic and fun rather than the hardcore stuff. Hardcore stuff is a lot of fun if you are wheeling someone else's rig and don't have to pay for the damage.
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Old 12-01-2013, 09:17 PM   #16
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I keed I keed. Im actually quite happy with my rig with 35s. Looks, performance, etc. I also agree with you that most of the time, the medium/mild trails are the most scenic and fun rather than the hardcore stuff. Hardcore stuff is a lot of fun if you are wheeling someone else's rig and don't have to pay for the damage.
Totally agreed ^^
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Old 12-05-2013, 02:18 PM   #17
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I have a 2008 JKU 6spd, 35's, with 4:56 gears. It's a perfect match. Runs just like it did when it was stock.

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