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Old 08-27-2012, 12:15 PM   #1
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33s and road performance

Just took a 600 mile trip and i have to say I wasn't thrilled at first on how the rig handled higher speeds. I didnt feel i had control of the jeep, mediocre accelaration ( espcially up hill). The last 300 back seemed to lighten up. 2012 jku 3.73 gears. I would like to hear some other issues out there tied with larger tires. Def not going to re-gear, but i am concerned if i will cause any internal damage.

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Old 08-27-2012, 12:18 PM   #2
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I have 33s with 3.21 gears (its a stick) and went on a 500 mile road trip from MA to up up up up up state ny (literaly on the canadian border) and my rig handled fine. i got 20.4 mpg averaged for the trip, and no problems going up all those hills

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Old 08-27-2012, 12:20 PM   #3
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oh, and i have 3k miles on my tires and i have no complaints about them. perhaps it's your tires, or you need an alignment.
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Old 08-27-2012, 12:27 PM   #4
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They are less then a month old.
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Old 08-27-2012, 12:34 PM   #5
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The 3.73 gearing should be able to handle 33's no problem and the stock tires are 32's. I would doubt the extra inch would be enough to cause other mechanical problems. Might be something else causing the poor handling.
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Old 08-27-2012, 12:36 PM   #6
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i mean, as far as feeling sluggish going uphill, that is from your gearing. but not feeling like you have control of the jeep sounds to me like either an alignment issue or unbalanced tires. just my .02
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Old 08-27-2012, 12:38 PM   #7
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Gotcha.
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Old 08-27-2012, 12:39 PM   #8
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The 3.73 gearing should be able to handle 33's no problem
rhen is right with this, even if you have an auto 3.73 should be more than fine with 33's, but if you think you notice a loss of acceleration uphill this is most likely why
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Old 08-27-2012, 12:40 PM   #9
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what tires do you have? i know there are some tires out there that are notoriously hard to balance/keep in balance
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Old 08-27-2012, 12:45 PM   #10
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Kumho kl78 at's
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Old 08-27-2012, 12:47 PM   #11
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I have the same problem going uphill. I loose speed and it is tough even to go beyond 60 mph. When i bought my 09 jk couple of months they already had pro-comp xtreme m/t tires on it. I know those are not good but i do not know what tires i need to upgrade. I appreciate any suggestions. I am pretty new to jeeps. I love the ride but is there anything i can do to make it even more better. This forum is awesome as i keep on learning new things every day
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Old 08-27-2012, 12:51 PM   #12
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Addy- probably need a lighter mt.
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Old 08-27-2012, 12:53 PM   #13
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ok, just did a quick google search for you on those tires. i saw over on titanforum and dieselplace people were complaining about the sidewalls being too soft. i know that these are full sized trucks and weigh more than a wrangler, but based on that, and you saying you felt like you didnt have control of the jeep, that could be your issue. if you have really soft sidewalls, it can creat a "floating" type of effect while driving
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Old 08-27-2012, 12:57 PM   #14
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Hmmm, interesting. This was also my first long haul trip, maybe getting adjusted to the feel had some play in there. I only drive 16 milea a day to work and it feels fine.
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Old 08-27-2012, 12:59 PM   #15
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I had those kumho's in a 33 and sold them after a 3-4 months. They're aren't that good of a tire if you ask me. Didn't like them in snow/rain and they seemed heavy. Offroad they weren't that bad but i just wasn't a fan of them
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Old 08-27-2012, 01:01 PM   #16
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I have the same problem going uphill. I loose speed and it is tough even to go beyond 60 mph. When i bought my 09 jk couple of months they already had pro-comp xtreme m/t tires on it. I know those are not good but i do not know what tires i need to upgrade. I appreciate any suggestions. I am pretty new to jeeps. I love the ride but is there anything i can do to make it even more better. This forum is awesome as i keep on learning new things every day

hey there addy

first off, do you plan on taking your jeep off-road? if so, how often/how aggressive do you plan on going in the next few years. the reason i ask is this: you are experiencing a bad highway ride because you have MT tires, although they are GREAT for off-road use, they can be noisy and uncomfortable during highway use. if you never plan on going off-road i would recommend the stock wrangler sra's for all your highway/normal driving use. if you plan on going out once a month, i would suggest i would suggest a slightly aggressive-medium aggressive AT tire. if you plan on going out a lot or just like the look of the MTs, look for a lighter MT made with a softer compound for on road use, with good sidewalls for off-road use.
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Old 08-27-2012, 01:05 PM   #17
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Remo- didnt seem to have a problem with rain. Maybe im over reacting with the handling. Just wanted to throw it out there and see other opinions. I can bare with it, i enjoy the look.
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Old 08-27-2012, 01:10 PM   #18
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Quote:
Originally Posted by N3M0

hey there addy

first off, do you plan on taking your jeep off-road? if so, how often/how aggressive do you plan on going in the next few years. the reason i ask is this: you are experiencing a bad highway ride because you have MT tires, although they are GREAT for off-road use, they can be noisy and uncomfortable during highway use. if you never plan on going off-road i would recommend the stock wrangler sra's for all your highway/normal driving use. if you plan on going out once a month, i would suggest i would suggest a slightly aggressive-medium aggressive AT tire. if you plan on going out a lot or just like the look of the MTs, look for a lighter MT made with a softer compound for on road use, with good sidewalls for off-road use.
Where would you say the Goodyear duratrac fits in that and with the softer sidewalls, a 16" or 17" wheel?
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Old 08-27-2012, 01:23 PM   #19
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I run the Duratracs in size 285/70-17 @35 psi. I replaced the factory Sport shocks with Bilsteins when I did the 2" spacer lift. The factory ride wasn't bad but the Bilsteins got rid of the feeling I was in a boat on water. My jeep rides firmer now but not harsh, much less body roll. Feels stable and predictable even at 75 mph. I know tires/air pressure have an effect but they are just one part of the equation.
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Old 08-27-2012, 11:05 PM   #20
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Originally Posted by SilverSport
I run the Duratracs in size 285/70-17 @35 psi. I replaced the factory Sport shocks with Bilsteins when I did the 2" spacer lift. The factory ride wasn't bad but the Bilsteins got rid of the feeling I was in a boat on water. My jeep rides firmer now but not harsh, much less body roll. Feels stable and predictable even at 75 mph. I know tires/air pressure have an effect but they are just one part of the equation.
Do you have 3.21 or 3.73 gears and auto or stick? Effects on mpg and hill climbing power
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Old 08-28-2012, 01:34 AM   #21
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I have 33.9" KM2s and 3.21s. Handling is not a problem. Gas mileage is pitiful- I don't look. Slightly sluggish- but with 3.73s I am surprised you notice a difference in acceleration. With a 35" tire maybe- but a 33? Maybe the wieght would make a difference but it would have to be alot. I don't know your wheel size size- couldn't look it up.
I have a feeling its your side wall as someone mentioned. Your tires are ATs right? We went from the BFG KM1 (pre-KM2) MT to a BFG AT tire on our Ranger. And wondered what the heck happened to our handling. Going around corners felt like cornering on marshmallows. Braking felt squishy. Hate those tires- soft sidewall. It took some getting used to.
Granted you went from a stock tire to your Kumhos- but is entirely possible that your Kumhos still have a softer sidewall than stock.
You can also try adjusting your tire pressure. The ride in my KM2s was spine-reducing out the door. The tire guys filled them to factory specs. A reduction to 28 PSI made the ride much softer- try the other way on your tires???....Your tire shop shouldn't have any problem checking your balance and adjusting your tire pressure.
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Old 08-28-2012, 01:40 AM   #22
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Originally Posted by N3M0 View Post
I have 33s with 3.21 gears (its a stick) and went on a 500 mile road trip from MA to up up up up up state ny (literaly on the canadian border) and my rig handled fine. i got 20.4 mpg averaged for the trip, and no problems going up all those hills
I bet it all depends on personal preference and experience.
Some people are happy in driving a Prius, not because of gas saving. To me, I found it's unbearable in waiting for it to speed up. And some people think 400HP is still not enough for a car.
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Old 08-28-2012, 04:56 AM   #23
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Quote:
Originally Posted by mhanksii View Post
Do you have 3.21 or 3.73 gears and auto or stick? Effects on mpg and hill climbing power
3.73 and stick. Slight loss of mpg going to the 285s and different rims.
Plenty of hill climbing power even here in Colorado.
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Old 08-28-2012, 05:07 PM   #24
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Quote:
Originally Posted by SilverSport

3.73 and stick. Slight loss of mpg going to the 285s and different rims.
Plenty of hill climbing power even here in Colorado.
Any chance we can get a pic (maybe even stock and now) of your wheel/tire combo
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Old 08-28-2012, 05:12 PM   #25
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Old 08-28-2012, 06:05 PM   #26
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I started a tread before....I have a 2012 auto, with 3:21 gears and wanted to put a 2.5 AV full lift and 33's with either Duratracs or BF Goodrich all terrains..I am having serious second thoughts hearing the loss of power and sluggish acceleration.
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Old 08-28-2012, 06:18 PM   #27
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Jeez- by all means its liveable, but i def notice the difference. With a procal i believe it will make the proper changes from what ive heard. Get your set up and you be the judge.
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Old 08-28-2012, 06:31 PM   #28
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I have a '12 JK with 3.73s auto, I put 285/70/17s on it, I get around 20mpg average on the highway. I go up to Maine quite a bit and have no problem with the cruise set to 72 or 73mph. I did use the Procal so my shift points, speedometer and mileage is accurate. No issues with driving at all power or handling wise.
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Old 08-28-2012, 06:47 PM   #29
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Where do u plug the procal in, and how easy was it. I read the manual ot atleast i think it was. Just said match it within the tire range and u r done in 5 sec
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Old 08-28-2012, 06:52 PM   #30
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Originally Posted by MacCTD
I have a '12 JK with 3.73s auto, I put 285/70/17s on it, I get around 20mpg average on the highway. I go up to Maine quite a bit and have no problem with the cruise set to 72 or 73mph. I did use the Procal so my shift points, speedometer and mileage is accurate. No issues with driving at all power or handling wise.
And I'm sold! I'm about to find out how bad 285-70-17 duratracs rub a stock 2012 sport! Weeee

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