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Old 08-07-2013, 10:00 AM   #1
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35" tires and 3:73 's

Anybody running this set up? I am going to move up to 35" tires and want to hear from guys that did this with out changing the gearing and have the 3.6 pentastar. It's probably not ideal, but with a tight budget trying to make this do. Getting bigger tires is the start of the domino effect. lol
Thanks guys!

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Old 08-07-2013, 10:11 AM   #2
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You can do it for sure but many will tell you its a bad idea. I disagree with that opinion because I am running 35s with 3.21's and it is manageable. Not ideal for sure and I will be changing my gearing this winter but you can definitely get away with 3.73's and 35s. Your MPG and acceleration may suffer a bit but i know i didnt buy my Jeep to see how far i could go in between fillups and certainly didnt buy it to race light to light!! Get your 35s and enjoy!

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Old 08-07-2013, 10:13 AM   #3
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I've heard of some people running 37's with the auto and 3.73 gears - This is not an ideal setup, but the people I have talked to seem to be ok running this setup. I think 35's and 3.73 gears on the 3.6 should be fine. A lot of people are running this combination. I am planning on running 37's so I am going with the 4.10 gears in the Rubi.
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Old 08-07-2013, 10:15 AM   #4
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so how big of a lift would he need for to run 35's ? 2.5in or 3in ?
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Old 08-07-2013, 10:21 AM   #5
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2.5" is all you need without too much trimming for 35's. 3.5" and you can fit 37's without too much trimming. 2.5" and flat fenders and you can squeeze 37's
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Old 08-07-2013, 10:38 AM   #6
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I am running 315/75/16 Duratracs with my 3.73 auto Pentastar and I am still extremely happy with the pick up speed cruising speed. iirc I was right at 2k rpm at 65 on the freeway with still lots of power to pass if I wanted. It may not be the perfect setup but it is far from poor IMO
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Old 08-07-2013, 10:43 AM   #7
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Thanks for the replies. I just need more money! Lol. Do it right the first time.
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Old 08-07-2013, 10:48 AM   #8
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I run 35's on my JKU with 3.73 and it does just fine. Handles the road and crawls like a champ. I'd recommend at least a 3" lift, but you can get away with 2.5" just have to deal with more rub on the fenders when flexing.
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Old 08-07-2013, 10:48 AM   #9
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I have 35X12.5X15's and 3.73's. I'm not bothered by the drop in mileage or the performance. The last two tanks I've gotten 18.5 mpg's and 18 mpg and that is awesome if you ask me. With the 6 speed it makes it easier.

As far as making them fit I just trimmed the fenders, if you buy the right fenders you can fit 37's with no lift. After the first time I had it offroad I decided to add 3/4" spacers.



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Old 08-07-2013, 11:00 AM   #10
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Quote:
Originally Posted by hookemhorns_98 View Post
I run 35's on my JKU with 3.73 and it does just fine. Handles the road and crawls like a champ. I'd recommend at least a 3" lift, but you can get away with 2.5" just have to deal with more rub on the fenders when flexing.
Great feedback
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Old 08-07-2013, 11:02 AM   #11
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I have 35X12.5X15's and 3.73's. I'm not bothered by the drop in mileage or the performance. The last two tanks I've gotten 18.5 mpg's and 18 mpg and that is awesome if you ask me. With the 6 speed it makes it easier.

As far as making them fit I just trimmed the fenders, if you buy the right fenders you can fit 37's with no lift. After the first time I had it offroad I decided to add 3/4" spacers.
Your jeep looks great. Considering fenders. I have a 2.5" lift already on
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Old 08-07-2013, 11:07 AM   #12
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Yea 35's will fit with a leveling kit and flat flares. You might get some rubbing off road
2.5" (actual height) is perfect for 35's
With flat flares even better.

This is with 3.5 and flat flares/35's.The only issue I need to take care of is my pitch seem. Plenty of room for a 37" tire.
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Old 08-07-2013, 11:45 AM   #13
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Quote:
Originally Posted by ElectricJay View Post
Anybody running this set up? I am going to move up to 35" tires and want to hear from guys that did this with out changing the gearing and have the 3.6 pentastar. It's probably not ideal, but with a tight budget trying to make this do. Getting bigger tires is the start of the domino effect. lol
Thanks guys!
I have a 6 speed with 3.73's and its absolutely no problem at all. I was weight conscious, which is why I went with the Duratrac's, and I use the gears the same way I always did. Pentastar pulls 6th gear with them on the highway just like it did with the 32" SRA's.

This was my biggest concern going with this size vs. 33's, and it was all for nothing. Some of the Nitto's are like 20lbs heavier per tire than the Duratrac's, that might make a huge difference.
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Old 08-07-2013, 11:54 AM   #14
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315/70/17 Duratracs here and feel the same way!

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Originally Posted by FBomb24 View Post
I am running 315/75/16 Duratracs with my 3.73 auto Pentastar and I am still extremely happy with the pick up speed cruising speed. iirc I was right at 2k rpm at 65 on the freeway with still lots of power to pass if I wanted. It may not be the perfect setup but it is far from poor IMO
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Old 08-07-2013, 12:14 PM   #15
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35's with 3.73 Auto 4" lift. Does just fine. Only annoyance is that when there is a uphill grade on the highway, it does not maintain speed and will downshift. Other than that, drives great.

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Old 08-07-2013, 12:29 PM   #16
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I have a similar plan to the OP. I have a '13 JKUR with 3.73's. Plan on a 2.5" lift with duratrac 315's and AEV pintlers. From what I have read on here what makes a difference with gearing is weight and size. Duratracs are definitely one of the lightest tires and everyone who has them says the actual size is much smaller than 35 inches.

Is there much difference between the weight of wheels or are they all pretty close?
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Old 08-07-2013, 12:56 PM   #17
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I too had pentastar, auto, 3.73, and 35" kumho tires. It was fine. No issues at all after adjusting with the procal and fine tuning with GPS for speed accuracy. I had flat style bushwacker fender flares and an aftermarket bumper with NO lift for a while, and it was fine too. There was absolutely no rubbing or bottoming out with plenty of room if you don't want a lift. I eventually went to a 2.5" AEV dualsport lift, but in reality did not need it. You will be fine with either a lift, new fender flares, or fender chop.
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Old 08-07-2013, 01:01 PM   #18
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Any of you guys with 35s and 3.73s have a problem with your crawl speed being way too fast?

Just curious.
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Old 08-07-2013, 01:02 PM   #19
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I have 3 friends that are running that setup with 35's and 1 with 37's. They have no problems keeping up with my TJ Rubi on 35's with 4.88's
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Old 08-07-2013, 02:07 PM   #20
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Yea 35's will fit with a leveling kit and flat flares. You might get some rubbing off road
2.5" (actual height) is perfect for 35's
With flat flares even better.

This is with 3.5 and flat flares/35's.The only issue I need to take care of is my pitch seem. Plenty of room for a 37" tire.
That looks great! Thanks
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Old 08-07-2013, 02:14 PM   #21
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I have a 6 speed with 3.73's and its absolutely no problem at all. I was weight conscious, which is why I went with the Duratrac's, and I use the gears the same way I always did. Pentastar pulls 6th gear with them on the highway just like it did with the 32" SRA's.

This was my biggest concern going with this size vs. 33's, and it was all for nothing. Some of the Nitto's are like 20lbs heavier per tire than the Duratrac's, that might make a huge difference.
great feed back. you guys are making me feel better about this. When your on a budget you have to mod in stages. I have had a blast wheeling my JKU Sport S as is (2.5" BB lift) everything else stock.
Thanks

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Old 08-07-2013, 02:14 PM   #22
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I have 315x75x16 BFG KM2's, 3.73 gears and an auto with 2.5" TeraFlex lift. Runs around just fine. Still has more power then the Patriot I traded in.
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Old 08-07-2013, 02:21 PM   #23
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Quote:
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I have a 6 speed with 3.73's and its absolutely no problem at all. I was weight conscious, which is why I went with the Duratrac's, and I use the gears the same way I always did. Pentastar pulls 6th gear with them on the highway just like it did with the 32" SRA's.

This was my biggest concern going with this size vs. 33's, and it was all for nothing. Some of the Nitto's are like 20lbs heavier per tire than the Duratrac's, that might make a huge difference.
Quote:
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I have 315x75x16 BFG KM2's, 3.73 gears and an auto with 2.5" TeraFlex lift. Runs around just fine. Still has more power then the Patriot I traded in.
Big Fran, Who makes the fender flares your Jeep?
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Old 08-07-2013, 02:25 PM   #24
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This is why I am happy with my choice of a 07 wrangler x that comes with 4.10 gears
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Old 08-07-2013, 02:27 PM   #25
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Big Fran, Who makes the fender flares your Jeep?
They are the Bushwacker flat fenders. I love them.
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Old 08-07-2013, 02:34 PM   #26
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37's, 3.73's, 3.6, auto. does just fine. wish it had a little more crawl but on my budget it is completely doable.

highway I get 16mpg as long as I keep it below 70. at 85 it likes to shift between 4th and 3rd depending on the wind.
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Old 08-07-2013, 02:41 PM   #27
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Here is mine 2012 3.6 3.73 6speed and 35's. It drives great on the road I would like the crawl ratio a little lower.

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Old 08-07-2013, 02:54 PM   #28
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This is why I am happy with my choice of a 07 wrangler x that comes with 4.10 gears
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Old 08-07-2013, 02:59 PM   #29
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I have a 6 speed with 3.73's and its absolutely no problem at all. I was weight conscious, which is why I went with the Duratrac's, and I use the gears the same way I always did. Pentastar pulls 6th gear with them on the highway just like it did with the 32" SRA's.

This was my biggest concern going with this size vs. 33's, and it was all for nothing. Some of the Nitto's are like 20lbs heavier per tire than the Duratrac's, that might make a huge difference.
x2

- With a six speed, plenty of power. If I was to regear, I'd only go up a little bit.
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Old 08-07-2013, 03:09 PM   #30
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In early JK's, you could get 4.10's in non-Rubi's.

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