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Old 02-04-2015, 09:30 PM
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315/70/17 Duratracs with 3.73 gears?

Has anyone ran or is running 315/70/17 Duratracs on a JK with 3.73 gears or tires around the same size for that matter? Like it? Hate it? Is it doable? Feedback is appreciated!

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Old 02-04-2015, 09:42 PM   #2
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Yes. Really like them. Tires are a really good balance of street ride vs off road. . I have 2014 rubicon automatic. 3.5 AEV lift. 3.6 liter motor If you have 3.8L most likely not enough torque

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Old 02-04-2015, 09:47 PM
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Yes. Really like them. Tires are a really good balance of street ride vs off road. . I have 2014 rubicon automatic. 3.5 AEV lift. 3.6 liter motor If you have 3.8L most likely not enough torque
I have a 2015 JKU with a 3.6L, do you think the 4.10's make a big difference compared to 3.73's? I love the look of 315's but I don't want to drive a dog around town if you know what I mean.
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Old 02-04-2015, 10:02 PM   #4
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I have the 3.6 with the same tires. Your driving a jeep, it's a dog all ready, so adding a bit more weight doesn't take you from a race car to dump truck. Do you notice it, yes, unbearable, no I don't think so.

I do recommend getting a tuner so you can adjust your tire size. It does help with the shifting. I have the aev procal to do it. So that is another expense.
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Old 02-05-2015, 12:38 AM   #5
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Same tire and size with 3.73s and the 3.8L. It is not ideal but it works fine and drives nicely. A tuner is definitely on my short list. I think with the 3.6L you would be fine..
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Old 02-05-2015, 01:25 AM   #6
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I've got this set up and it's doable. I live in pancake flat Florida so I don't notice it around town but do notice it merging onto the interstate and on bridges. As someone else pointed out, it's a dog already because it's a Jeep.
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Old 02-05-2015, 02:54 AM   #7
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you should be fine. totally doable
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Old 02-05-2015, 06:14 AM
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Im in Pennsylvania, not the flattest state lol, I might as well take a chance on the 315's I'd hate to be one of those guys who has nightmares about going smaller then bigger.
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Old 02-05-2015, 06:17 AM   #9
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I ran them and was happy but then I went 4.88 when I did lockers. I have a 0-60 video on 3.73 and 315/70/17 Duratrac if I can link it I will

http://youtu.be/aXR-gnqSTsI
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Old 02-05-2015, 07:18 AM   #10
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Some other considerations to get them to fit;

2.5" lift or trim fenders and air dam
Properly back spaced wheels or wheel spacers
Upgraded tire carrier for spare
ProCal for speedo adjustment

If going off road consider:

Sleeves, gussets, truss for axles
Upgraded ball joints
Regear
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Old 02-05-2015, 08:04 AM   #11
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Those technically are a 35ish. Will the rig get you from point A to point B? Yes. Will you lose what get up and go you had? Yes. Will you be putting added stress on your engine and transmission being geared too high? Yes. Will you dislike big hills? Yes.

Temporarily sure you could run that. But strongly suggest pony up and regear. Big Jeeps are a pay to play sport.

I ran 37s on 4.10s for a few weeks between my lift and gears, now at 5.13. It got its guts back.
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Old 02-05-2015, 08:23 AM   #12
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I will add that I'm running this exact setup on my 2014 JKU and have no problems and I live in Colorado at 7000 feet altitude to start and regularly travel up to 12000 feet and don't have an issue not to say that it could be better but it is more than enough to get the jump on people at a light I still have great acceleration. I have taken mine off road all over Colorado and to moab and really can't say that it's ever been an issue including traveling over mountain passes at highway speed fully loaded. Feel free to take a look at my pictures in the link below see all the places that I have taken my Jeep over the last 9 months.
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Old 02-05-2015, 09:07 AM   #13
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chargermop, I'm running the same tires on our JKU Willys. Stock wheels too.

What PSI did you settle on?
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Old 02-05-2015, 09:10 AM   #14
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chargermop, I'm running the same tires on our JKU Willys. Stock wheels too.

What PSI did you settle on?
I am currently running 34 psi seems to work well all around.
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Old 02-05-2015, 11:37 AM   #15
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I love the tire. Are there better tires for rock crawling, yes. The duratrac have great road manners and so far they have done fine off-road. To be honest, I haven't wheeled them that hard but expect good things from them from what I've read. Hardly any road noise and fairly lite for a 34.5 tire. I have 3.73's in my 2014 with a Superchips Trail Dash. I tested it with the stock tires and no tune, then the same day with the 315's and an 87 tune and didn't notice a difference regarding the power and highway mpg still seems to be about the same. I have a rubi so the stock tires where around 32. It's still a bit subjective since you are relying on your senses rather than a rear wheel dyno.
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Old 02-05-2015, 04:43 PM
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Those technically are a 35ish. Will the rig get you from point A to point B? Yes. Will you lose what get up and go you had? Yes. Will you be putting added stress on your engine and transmission being geared too high? Yes. Will you dislike big hills? Yes.

Temporarily sure you could run that. But strongly suggest pony up and regear. Big Jeeps are a pay to play sport.

I ran 37s on 4.10s for a few weeks between my lift and gears, now at 5.13. It got its guts back.
I know what you mean the prices definitely add up, I wanna do it right the firs time this way it saves me money down the road. I purposely ordered the jeep with the upgraded gears. I was a little upset to find out the biggest gears I could get were 3.73's with a non rubi. Id really hate to swap gears on a brand new JKU because of the money I spend for them already but I know eventually I'll need 4.56's or bigger. A lot of tough decisions.... and money...
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Old 02-05-2015, 05:02 PM   #17
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I don't think I would do it. I just put on 33" Duratracs and I have a 2014 3.73 with a 2.5" lift. It handles the 33" fine but I even notice that it feels like there is slightly less power on the highway with them. Not much but I did notice it compared to the stock Duelers. Not very much but it's there. With 35" tires you will probably easily notice a difference.

The Duratracs are great so far IMO. SUPER quiet on the highway for sure! Duras are pretty big tires but don't weigh too much which is good too. They also look like mean as hell!!!
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Old 02-05-2015, 05:17 PM
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I don't think I would do it. I just put on 33" Duratracs and I have a 2014 3.73 with a 2.5" lift. It handles the 33" fine but I even notice that it feels like there is slightly less power on the highway with them. Not much but I did notice it compared to the stock Duelers. Not very much but it's there. With 35" tires you will probably easily notice a difference.

The Duratracs are great so far IMO. SUPER quiet on the highway for sure! Duras are pretty big tires but don't weigh too much which is good too. They also look like mean as hell!!!
Have any pictures of your rig with the 33's? Id like to see how they look with a 2.5 inch lift.
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Old 02-05-2015, 05:33 PM   #19
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2.5 Teraflex Coil lift, 315 Duratracs, 1.5 spacers and 3.73s...runs and performs fine. Speed corrected with a Procal,
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Old 02-05-2015, 05:37 PM
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2.5 Teraflex Coil lift, 315 Duratracs, 1.5 spacers and 3.73s...runs and performs fine. Speed corrected with a Procal,
Thats the same color I have looks great, was leaning towards 315's now I'm second guessing, I really don't want to have to re-gear down the road like a lot of people are saying I am.
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Old 02-05-2015, 05:41 PM   #21
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Uncle Santa brought me a set of 315/70 17 Kumho MTs
A bit more aggressive than the Duratrac's but are quiet for a MT
Running a 2010 JK with the 3.8 & 3:73 gears
To be honest, only notice the power loss on steep grades
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Old 02-05-2015, 05:42 PM   #22
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I have 3.5 lift with 317/70/17 Duratracs also with 3.73 gear ratio and honestly I do love how it drives so far no problems and the only difference I have noticed is the MPG's.
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Old 02-05-2015, 05:42 PM   #23
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It was sluggish before the Procal, after, no discernible difference. Mileage is worse, but it has plenty of oomph
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Old 02-05-2015, 06:25 PM   #24
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You'll be fine. First of all, the Duratracs are aren't that heavy as say a Toyo Open Country. They're also a great all around tire. I have several friends who are running the same setup with 3.73's with absolutely NO issues at all and we live in CO @ 6,000' elevation. You will notice a slight difference in performance, especially when going uphill but I would strongly suggest the Superchips FlashPaq as it really brought their JKU's back to life. Only thing though, it's not available for the 2015's yet. You could get the FlashCal and upgrade to the FlashPaq later.

Take it from me, I ended up with 33's. If I could do it over again, I would've bought 35's.
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Old 02-05-2015, 06:26 PM   #25
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Not to rob the thread but the difference between that 2.5 teraflex and the 3.5 ? Lift is massive!
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Old 02-05-2015, 07:14 PM   #26
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I have a 2.5" TF spring lift and 1" TF spacers with Rancho 9000s ready to install into wife's 15 with 3:73 as soon as I get time. Will be going with the 315/70/17 Duratracs.
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Old 02-05-2015, 08:41 PM   #27
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I have the AEv 2.5 with 35" Duratracs on my 2015 JKUS with 3.73 gears. It runs OK...biggest notice is slight drop in MPG by about 2-3 mpg. It is definitely not s-l-o-w but not as agile as with the factory shoes either. It is definitely livable.

However, I know that the sweet spot with 35's is 4.56 gears so I am re-gearing next week to get mpg back up and performance closer to factory spec. I will also sleeve, gusset and truss at the same time to strengthen the front axle. I will also roll in an ARB locker in the front and swap out the clutch LSD in the rear with Detroit TrueTracs while I am re-gearing.
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Old 02-27-2015, 04:54 PM   #28
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However, I know that the sweet spot with 35's is 4.56 gears so I am re-gearing next week to get mpg back up and performance closer to factory spec. I will also sleeve, gusset and truss at the same time to strengthen the front axle. I will also roll in an ARB locker in the front and swap out the clutch LSD in the rear with Detroit TrueTracs while I am re-gearing.
How much can a fella expect to dish out for what you plan to do?
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Old 03-12-2015, 02:42 PM
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How much can a fella expect to dish out for what you plan to do?
He will probably pay a pretty penny for all of that haha, lets just say that!
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Old 08-03-2016, 09:57 AM   #30
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If anyone has 315 70 17 Duratrac's mounted on factory Rubicon rims, will you please measure the height of the tire while mounted with the weight of the vehicle?
Thank you.

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