33s or 35s??? on a 3.21 gear????NARROWING IT DOWN. - Jeep Wrangler Forum
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Old 06-28-2012, 12:53 PM   #1
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33s or 35s??? on a 3.21 gear????NARROWING IT DOWN.

Me again,

Is ANYONE out there running a 35" tire on 3.21 gears and a 6 speed manual??? I am thinking this is WAY too much tire for this gear???? (It is my DD and I am MOSTLY a highway driver,with a FEW,bad county roads.)

Going to buy a "winter/bad weather" set of tires and wheels. Will change back to the 255/17s in the spring.



2012 JK 2 door.

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Old 06-28-2012, 12:58 PM   #2
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I would not do 35's

3.21's are bad enough stock IMO

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Old 06-28-2012, 01:50 PM   #3
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Me again,

Is ANYONE out there running a 35" tire on 3.21 gears and a 6 speed manual??? I am thinking this is WAY too much tire for this gear???? (It is my DD and I am MOSTLY a highway driver,with a FEW,bad county roads.)

Going to buy a "winter/bad weather" set of tires and wheels. Will change back to the 255/17s in the spring.



2012 JK 2 door.
My wife is. If had to do over again now knowing what we know she would have done 3.73 at a minimum. I've been calling the 3.21 drivable but not anything close to ideal.
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Old 06-28-2012, 01:57 PM   #4
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Me again,

Is ANYONE out there running a 35" tire on 3.21 gears and a 6 speed manual??? I am thinking this is WAY too much tire for this gear???? (It is my DD and I am MOSTLY a highway driver,with a FEW,bad county roads.)

Going to buy a "winter/bad weather" set of tires and wheels. Will change back to the 255/17s in the spring.



2012 JK 2 door.
From experience, I have 3.21's and a 6sp 2012 JKU and 33x12.5x15 Goodyear DuraTracs. It is mostly fine (keyword mostly) I live in MA and there are a lot of hills, 6th gear is pretty much useless currently. 1-5 are just fine, plenty of pick up, you just really start to notice the loss of power on hills. 6th is fine on completely flat roads, a little sluggish, but managable. I could only imagine how horrid it would be with 35's though. So to answer your question, go with 33s or regrear and get 35s =)
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Old 06-28-2012, 02:00 PM   #5
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I would not do 35's

3.21's are bad enough stock IMO

3.21s are not bad stock with 2012s. there is a HUGE difference between 2007-2011 3.21 and the 2012.

just sayin

i had a 2dr 2011 jk with 3.73s and now the 2012 jku with 3.21s and i have WAY more power (well had before the new tires) in my 2012 then i did in my 2011.
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Old 06-28-2012, 02:06 PM   #6
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Waiting for others to beg to differ, especially running bigger tires.

You do have a point with 3.6/3.8 but still...........
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Old 06-28-2012, 02:08 PM   #7
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had 373s with an automatic and 37's for a year. although it wasnt a dd, it was more of a hassle going over rocks than driving on the street.

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Old 06-28-2012, 02:26 PM   #8
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Your going to have to lift in anyway for 35s so why not swap gears too. Not only will 6th gear be useless you'll hate how poorly it crawls. As if it isn't bad enough with 32s.

My first major job is swapping gears. I hate the 3.21 off road.
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Old 06-28-2012, 02:36 PM   #9
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i still dont know why chrysler doesnt offer 4.10s as an option for non rubi models...
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Old 06-28-2012, 02:37 PM   #10
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Waiting for others to beg to differ, especially running bigger tires.

You do have a point with 3.6/3.8 but still...........
dont get me wrong, they are far from ideal just comparing from the 2011 to the 2012 its a huge difference
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Old 06-28-2012, 02:40 PM   #11
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i still dont know why chrysler doesnt offer 4.10s as an option for non rubi models...
My guess would be because they'd sell a lot fewer Rubi's along with the extra premium they get.
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Old 06-28-2012, 02:43 PM   #12
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I would think that auto to auto, (3.73 vs 3.73)there is no comparison due to the piss poor gearing of the 42RLE. But manny to manny....I don't know. The added engine power of the 3.6 might nearly be offset by the slightly taller (.797 vs .84) 6th gear in the 2012's.

That is my best guess.... Get the 33's....
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Old 06-28-2012, 02:43 PM   #13
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My guess would be because they'd sell a lot fewer Rubi's along with the extra premium they get.
makes sense i guess. wishful thinking i suppose
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Old 06-28-2012, 02:44 PM   #14
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My guess would be because they'd sell a lot fewer Rubi's along with the extra premium they get.
It would also kill their overall Wrangler fleet fuel economy.
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Old 06-28-2012, 02:48 PM   #15
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I would stick with 33's
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Old 06-28-2012, 02:48 PM   #16
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It would also kill their overall Wrangler fleet fuel economy.
Great point!
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Old 06-28-2012, 02:50 PM   #17
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Great point!

yea, x2 didnt think of that either.


i wonder though, if it were an option how many people would get it. TONS of people still get the 3.21s even though 3.73s are available.
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Old 06-28-2012, 06:23 PM   #18
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Well some of us got 3.21's because the only vehicles on the lot with 3.73's had a bunch of add ons we did not want. I wanted a base sport, w/auto trans and nothing else, no power, no convenience pkg, no u-connect Nada. I could have ordered a sport base, but I would not have gotten it for only $21735 with a hard top like I did mine. So far with the S package wheels and tires I bought off CL I am happy with the performance, that may change when I upgrade to 33's we will see.
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Old 06-28-2012, 06:48 PM   #19
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I got some GOOD insight here. BTW,I INTENTIONALLY got the 3.21s on purpose. I sought them out!!!! I was looking for decent gas mileage. With my 255/75/17s I am getting 21-23 MPG on the highway.(Checked it at the gas pump x2 now,NOT the ECM computer.) My stock SR As measure 32" and change O.D. In the real world. They do not "lug down " the engine in first gear when I take off. I think I will be going for a really COOL set of 33" tires on my wheels for the bad weather. I am thinking I would want a 3.73 gear,or BETTER for 35"s or taller. (MOSTLY street driving,4.10s ,4.56sfor being "off road" most of the time.for most ANY size tire.)
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Old 06-28-2012, 06:50 PM   #20
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Glad we could all help
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Old 06-28-2012, 06:52 PM   #21
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Glad we could all help
Learn new things EVERY time I have been on here.!

BTW,your jeep is hot!
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Old 06-28-2012, 06:58 PM   #22
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Thanks man! Here is a close up of my 33 Duratracs. Nice lightweight AT tire that will help keel your mpg up when you switch to 33s

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Old 06-28-2012, 06:58 PM   #23
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I have a set of 35's on and 3.21 gears its not that bad at all But I dont drive anymore like my jeep is a race car I do give it hell though lol. IMHO 35's will be fine on your jeep you have a 2012 and it has more HP.
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Old 06-28-2012, 07:10 PM   #24
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I have a set of 35's on and 3.21 gears its not that bad at all But I dont drive anymore like my jeep is a race car I do give it hell though lol. IMHO 35's will be fine on your jeep you have a 2012 and it has more HP.
looks good. What is 6th gear like? HOW many RPM are you running at going down a FLAT section of highway?????


I want a 2.5 lift with those tires you are running.
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Old 06-28-2012, 07:23 PM   #25
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I have a 2012 manual with heavy Nitto 285/70/17, and 6th is unusable until over 70 mph, and only on flat roads. 33x12.5 is the max I would go.
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Old 06-28-2012, 07:31 PM   #26
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looks good. What is 6th gear like? HOW many RPM are you running at going down a FLAT section of highway?????


I want a 2.5 lift with those tires you are running.


Well I live in HI rite now so I dont make it to 6th gear much I do use it on the high way. RPM is around 2700 I think in 6th at 70 MPH. But after the lift and tires I got the Pro Cal and it made everything run better. best 150 bucks spent after my mods on the jeep.
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Old 06-28-2012, 09:43 PM   #27
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TONS of people still get the 3.21s even though 3.73s are available.
Most of them have no idea there are different gear options, much less what they mean. Salesmen never touch that subject. I would've probably went with 3.73's had I known they were an option.
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Old 06-29-2012, 07:00 AM   #28
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I've had 35s and 3.21s on my '12 Unlimited for a little over a month now and have logged around 2,000 miles. Well, 35" KM2s, which measure at 33.5" @ 28 psi loaded. I tried to get 3.73s when I bought the Jeep (Sport S), but I didn't worry about it too much knowing even 3.73s would get swapped out w/ 35s eventually, and I really wanted Sahara Tan which was hard enough to find at that point.

It's not ideal. Around town, it's only noticable in 1st, and even then it's not a huge deal. I just give it a little more gas and get off the clutch quicker. After that you just shift a little less often, and run the RPMs up a little higher, and it's really not an unpleasant driving experience... Not a dog at all. You just have to rethink which gear you should be in, and adjust accordingly. Granted that's not using 6th at all, but 5th w/ my tires and gears is equivalent to 35s and 4.11s according to the charts, so I'm at 2,200 - 2,300 RPM @ 72 mph.

Having said all of that, once I save up the money, I'll be going with 4.56 gears when I add lockers to get some of that get up and go back.
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Old 06-29-2012, 07:58 AM   #29
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Most of them have no idea there are different gear options, much less what they mean. Salesmen never touch that subject. I would've probably went with 3.73's had I known they were an option.
It wouldn't surprise me if even some of the sales people don't know this.
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Old 06-29-2012, 03:41 PM   #30
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Ok I have to correct my last post I made I was on the way home yesterday and got real numbers at 60MPH in 6th gear I am running at 1600 RPMs.

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