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-   -   35s with 3:21s? (http://www.wranglerforum.com/f274/35s-with-3-21s-263882.html)

Gekco13 08-19-2013 02:02 PM

35s with 3:21s?
 
Hey new to the forum just got my 2013 jk wrangler and want to lift it 2" and wanted to put on the duratracs 315-70-17 but I have 3:21s....anybody running this setup or is the tires too big? I'm not offing with it just my daily driver and want it to look good. I have the 6 speed if that matters.

live_slow 08-19-2013 02:10 PM

Opinions vary.

Generally, I would think 4.56:1 with the 315s on a 13 JK MT would be optimal for mixed/street use and 4.88:1 for more agressive offroad use...

However, you will find many opinions on multipile threads here. There are users driving 3.21:1 on 33 and 35 inch tires who have shared their experiences.

This one is similar to your question: http://www.wranglerforum.com/f33/3-2...es-255685.html

ave8er 08-19-2013 02:46 PM

I have a '14 with 3:21's and in a week I will have the 35's on it. I had 33's on my '12 with the same ratio and I didn't have any problems at all. It was a 2dr and the '14 is a 4dr... I do live in florida and the only mountain is Mt. Dora, elevation 324'

OffRoadCam09 08-19-2013 04:32 PM

You'll be fine. I have 3.21's with 35x12.50x15's an a 2.5" lift an mine pulls just fine. Also got 19.3 mpg on my last tank of gas

Quadtrax 08-19-2013 04:48 PM

I have a 2013 JK with 3.21, with 2.5 lift and 35's the motor worked hard at 70 mph (rpm) and I got 15.1 mpg. Switched to 33's and the motor calmed way down and my mpg raised to 17.8 ... Offroad was no differents, both worked fine.

Not bashing either one just passing on what I got.

Austin_FL 08-19-2013 05:03 PM

I would regear 35s are too much for a 3.21 gear setup. You'll have problems in the long run. They aren't designed to spin a 35 tire.....

ohioviper 08-19-2013 05:42 PM

I would run them and then decide if you need a re gear. Some folks are happy and some are not.

JeepHerz 08-19-2013 06:16 PM

http://www.wranglerforum.com/f33/3-2...st-209000.html
Older threads but the questions/results are the same. The biggest complaint I've read with 6 speeds is that you can't really use 6th anymore- no power left there. I have an auto, 35s, 4.56s and love it. Lasted less than a year on 3.21s and 305/70/17s. (Maybe I should mention I was referred to as "Speed racer" this weekend LOL). I also wheel with guys who have 35s and find it totally "liveable".

Austin_FL 08-19-2013 07:05 PM

You should be concerned with the ratio running 3.21..... Not only are you stressing the gears but the transmission is working harder as well. It's not designed to run 35s. The people that are will find out soon enough in the long haul

Gekco13 08-19-2013 08:41 PM

this is all great info....thanks. this is my first jeep and love it! I really want to run 35s but I might go 33s for now...til this set wears out and then go bigger and regear. this way I can gain most experience.

TOK 08-19-2013 09:11 PM

Quote:

Originally Posted by Austin_FL (Post 4097546)
You should be concerned with the ratio running 3.21..... Not only are you stressing the gears but the transmission is working harder as well. It's not designed to run 35s. The people that are will find out soon enough in the long haul

I don't think its going to do anything to the 6 speed like it would to an automatic. Nowhere near the heat generated, the 6 speed won't go into a confused gear-hunting tizzy, and the clutch will always crap its pants first. :D

I'm running 315/70/17 Duratracs with no problem, but I have 3.73's. It feels a little bit lazier on long hills, sometimes requiring a downshift to 5th where the 32's would have pulled 6th. Overall, its no problem.

PieFace 08-19-2013 09:16 PM

Quote:

Originally Posted by Gekco13 (Post 4097917)
this is all great info....thanks. this is my first jeep and love it! I really want to run 35s but I might go 33s for now...til this set wears out and then go bigger and regear. this way I can gain most experience.

i hope this guy^ comes back to read this...

Do not do what your talking about doing. HUGE ROOKIE MISTAKE.

go straight to 35s. If there is anything you dont like, it will be your gears.

after a year, you will think the 35s are small.

everyone I know who went 33s first, upgraded to at least 35s within a year.

Look a the 315 duratrac, its an AT 34. thats the minimum size tire if your going to pay for tires.

just my humble opinion

ahsumtoy 08-19-2013 10:10 PM

Stay with 33's
 
With a 2 1/2" lift and 3.21 gears, I would run 33's IMO.

NFRs2000NYC 08-19-2013 10:18 PM

Not sure where you live, but I have 33s on 3.21s, and find it barely acceptable in the tristate NY area. Unless I am going downhill, 5th has become useless (worse MPG in 5th than in 4th.) I couldn't imagine how slow and painful my rig would be with heavy 35s. IMHO, don't do it.

bcsnave 08-19-2013 10:45 PM

That a boy Dave
 
Set 'em straight...new Jeep...1st one...so no off road wheeling experience that he mentioned. It would be a huge mistake OR force him to go to a re-gear right away.

Welding Rod 08-19-2013 11:02 PM

OP - do you have experience with an over tired rig?

If not, you may be sorely disappointed in the poor performance of your jeep after adding a huge amount of unsprung and rotational mass. You will find our jeep will take longer to stop and accererate, will handle worse, ride worse, and suck gas, not to mention the gearing issue.

I can't imagine putting 35s or even 33s truck tires on a daily driver unless you take your (slow) off reading very seriously. Personally I think about 31" inches is about the best compromise in ground clearance and weight unless you find your offloading has you scraping parts.

I would consider a small lift and stock tire before adding the weight of heavy rubber on there.

Moonrider 08-19-2013 11:04 PM

Go with 315/70/17 duratrck. I have same on my 13 JKU with 3:21 and auto trans. I'm happy with it. I have done some average offroading and still felt there was plenty of power left. As someone already mentioned, don't go with 33" if you liked look of 35". After 3 month i started looking at 37". But i know its not gonna happen, since i'm 100% satisfyed with 35.

scapegoat32 08-19-2013 11:10 PM

What about a 315 70 17. It comes out to roughly a 34.7 x 11.50. a little skinnier would help. I dont know if i got a good one, but my jeep has 3.21s and 285 70 17 which is the same as a 33 x 1150 and it goes like a bat out of @#$%. its my daily drive and am considering the first mentioned tires. I guess im just not that interested in going fast anymore..

MikeK46 08-19-2013 11:28 PM

Quote:

Originally Posted by NFRs2000NYC (Post 4098390)
Not sure where you live, but I have 33s on 3.21s, and find it barely acceptable in the tristate NY area. Unless I am going downhill, 5th has become useless (worse MPG in 5th than in 4th.)

Whenever I put it in Drive, i've gotten into the habit of using the E-shift to put it on [3] right away. So unless I'm on the highway (rarely), I don't use anything above 3rd...where @ 40mph it's still only 2000rpm.

Driving in [3] prevents it from holding onto 1st gear during a turn, significantly minimizes hunting, and minimizes the chance of revs dropping down into the "no power" range.

whitesport 08-19-2013 11:33 PM

I was running GY Duratracs 33's with a 2 1/2" lift and I thought those tires were too small. Go for the 35's . I have the KM2's and love them on my 07 manual 3.21 gears now on a RC 4" lift. I've learned to always go higher or larger in the Jeep world and you won't regret it. Everything looks good on a Jeep if its bigger and higher. That's if your a STANCE guy.

New2012JEEP 08-19-2013 11:43 PM

If you are staying with 3.21, I would not go over 33.

sanchese 08-20-2013 12:06 AM

I have 4.10 gears running Mickey Thompson atx 305/70/R17 and a 2.5 inch lift with no problems.

I ordered my the 4.10 gears with my Rubicon knowing I would go with larger tires some sooner or later.

ohioviper 08-20-2013 01:09 AM

33" Duratracs on 15" rims is so close in weight you will hardly notice the power loss and with 35" tires you will for sure notice the loss but for some its not that bad. Depends a lot on the tires weight. I could do 35s and live with it I think but most likely would re gear to a 4:56. Like others have said if you really want 35s you will regret the 33s. Just know that you may not like the power loss and have to re gear.

JKjingle 08-20-2013 01:45 AM

I'm running that exact setup it really isn't bad. 6th is now useless yes but it was useless before anyways. I find the only negative is its a little harder to start without slipping the clutch a lot on hills but other than that it's fine. If you want 35s get them. 33s and 35s cost pretty much the same. And if its for looks I wouldn't worry about the axles or anything they won't break. On the highway it's fine too. The newer engine isn't as troubled as the old 3.8l. However I do offroad and ill probably regear at some point but not in a rush.

dawhitesJKU 08-20-2013 02:33 AM

Quote:

Originally Posted by scapegoat32 (Post 4098618)
What about a 315 70 17. It comes out to roughly a 34.7 x 11.50. a little skinnier would help. I dont know if i got a good one, but my jeep has 3.21s and 285 70 17 which is the same as a 33 x 1150 and it goes like a bat out of @#$%. its my daily drive and am considering the first mentioned tires. I guess im just not that interested in going fast anymore..

Don't go by specs...use a ruler. Duratracs 315/70/17 are 34 when mounted. My tires are 285/70/17 and when mounted....came up to exactly 32. 1 inch is a big difference when u adjust ur procal/ or other programmer. Even my old 35x12.5/18 on my old truck was 34.5.

Gekco13 08-20-2013 10:48 AM

I measured my tires and from factory they measure 31" and my buddies which are a 33" measure 31 1/2".....so I think I'm going to go 35"...I like the look and if I rely have to then I'll regear. The duratracs measure about 34 so I will give them a try. Thanks for all the input been very helpful.

Silverback51 08-21-2013 07:45 PM

I have 3.21 gears and I was a little concerned what would happen with bigger tires.

On Monday my wheels came in and I mounted up some 315/70-17 GY Duratracs and while there is a little difference, it's sure not the end of the world some predict. To me it seems like some of the concerns are like urban legends. If they get repeated enough then they must be true.

Anyway, I have put a couple hundred miles on it and it was fine, and that was before I had the time to reset it with the ProCal. Just did that this afternoon and I have another close to 100 mile day tomorrow.

Now I do have to quantify what I have stated. We bought this jeep to be a dingy behind a motorhome. It's not going to see any serious offroading. At most it might see a forest service road. If I was going to do some serious offroading, then new gears would be on order.

Daniel_M 08-21-2013 07:51 PM

So like a lot of you “new” Wrangler owners, I didn’t think 35’s on my 3.73 were that bad. I tolerated it for over a year.

After a while I installed 5.13. NIGHT AND DAY difference. Much better. Disappointed I didn’t do it sooner. I would definitely want at LEAST 4.10 on the 3.6L with 35’s, but would opt for 4.56 aftermarket. Running bigger tires, you lose crawl, final gear/OD etc…Why would that ever be ok with some of you guys??

-Dan

Chx beach 79 08-21-2013 08:21 PM

IMO, if you aren't going to regear then don't put bigger tires on it! It defeats the whole purpose of putting the tires on it. Even a slightly bigger tire will throw gears off quite a bit. Not to mention the unwanted stress on the transmission.

Austin_FL 08-21-2013 10:04 PM

Quote:

Originally Posted by Chx beach 79 (Post 4105992)
IMO, if you aren't going to regear then don't put bigger tires on it! It defeats the whole purpose of putting the tires on it. Even a slightly bigger tire will throw gears off quite a bit. Not to mention the unwanted stress on the transmission.

This^


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