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Old 10-08-2013, 06:39 PM   #1
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Unhappy 35īs and 3.21?

Yeah the name of the tread is my question.

Does anyone run 35īs with 3.21 gearing it seems like a bad combination but thats the gearing i have (i got my jeep and thought i wouldnīt do any mods to it so i didnt care about the gearing...).

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Old 10-08-2013, 06:44 PM   #2
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I wouldn't recommend it. What year Jeep? Lift?

Even on the 12-13's I wouldn't suggest 3.21, ever. BUT it isn't the end of the world.

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Old 10-08-2013, 07:12 PM   #3
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I have for about 3 weeks now,the only thing I have really noticed is that it shifts down sooner when going up hills. Mines a daily driver and I'm not in to mud or mountains.
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Old 10-08-2013, 07:15 PM   #4
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Quote:
Originally Posted by dominik View Post
Yeah the name of the tread is my question. Does anyone run 35īs with 3.21 gearing it seems like a bad combination but thats the gearing i have (i got my jeep and thought i wouldnīt do any mods to it so i didnt care about the gearing...).
I drove ours for about two months with 3.21s and 35s. It wasn't the end of the world but not ideal either. If you have an auto it will shift more often and your gas mileage will go in the crapper but it is manageable. I have now switched to 4.56 gears and it is much better.
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Old 10-08-2013, 07:51 PM   #5
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Originally Posted by BB1857 View Post
I drove ours for about two months with 3.21s and 35s. It wasn't the end of the world but not ideal either. If you have an auto it will shift more often and your gas mileage will go in the crapper but it is manageable. I have now switched to 4.56 gears and it is much better.
i agree totally. i drove mine for 2000 miles then i went with 4.88 gears. it is soooo awesome now. 3.21 is not the end of the world and can be done but it is not where it should be. i could have drove mine for many more miles but i wanted 4.88. you will be ok. but eventually might wanna regear
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Old 10-08-2013, 07:56 PM   #6
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Thanks so far!
Mine is a 2013 with auto with so far no lift or bigger tires im just planing on what to do.

Im living in Wilmington North Carolina here are no hills or mountains there is just lots of mud!

It is also my daily driver, i just think a 2.5 inch lift is not worth the cost if i dont add bigger tires....
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Old 10-08-2013, 09:30 PM   #7
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running 315/70r17 duratrac (real close to 35) on 3.21 and no problems at all. Runs fine. Plenty of power. Runs 75 on interstate in 5th with no downshifting on our rolling hills of east texas.

Dont let gears be a deciding factor unless your going BIG.
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Old 10-08-2013, 10:02 PM   #8
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This chart will show you where gearing comes into play based on tire size. I know from other Jeepers experience that running 35's on 3.21 gears will wear those gears down faster too and put more strain on the whole drivetrain. But, that's the risk you take in wanting bigger wheels for no other reason but because you think bigger is better. Wanting bigger tires is fine if you do it the right way. Keep in mind that the 5th tire that's 35" (anything less as a spare is effin stupid), mounting it on the stock gate will lead to weld breakage as it isn't designed to carry that added weight especially since it will stick out further adding more stress. So you will also need a beefier bumper and/or tire carrier. Go ahead. Flame on!
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Old 10-12-2013, 08:14 AM   #9
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Originally Posted by BB1857 View Post
I drove ours for about two months with 3.21s and 35s. It wasn't the end of the world but not ideal either. If you have an auto it will shift more often and your gas mileage will go in the crapper but it is manageable. I have now switched to 4.56 gears and it is much better.
Whats your city/hwy mileage with the 4.56? Whats your jeep? Thanks
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Old 10-12-2013, 08:45 AM   #10
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Ive had 35s on 3.21 for over 6 months. I live in central NC. I've driven though the Western NC mountains, wheeled Brown Mountain (very steep), wheeled URE 3 times since the 35s including the hardest, steepest trails. In general when I wheel I'm in 4LOW. I stay in 4HI on the beach.

On the highway it will stay in 5th on gentle hills if I'm over 70mph. Under that I use the auto selector to putting 4th and its happy.

City driving in the hilly area I live in is little different that when it had 32s.

So it's perfectly doable. That said I do plan to regear at some point just so that it's not working so hard on the highway.

FWIW, adding steel bumpers and the winch had just as big an impact on mileage as the upgrade to 35s
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Old 10-12-2013, 09:59 AM   #11
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Things Above what ya getting for mileage now. Just road use,no city or hwy I'm at high 13-low 14
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Old 10-12-2013, 10:48 AM   #12
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Things Above what ya getting for mileage now. Just road use,no city or hwy I'm at high 13-low 14
I average 17 in my commute and 16 highway. When it was stock I averaged 20 commute and 22 highway. That's measured at the pump, not the computer.

My commute is about 50 miles a day and 26 stop lights combined.

Tire pressure is 28psi
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Old 10-12-2013, 12:02 PM   #13
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I have 13 jku auto with 3:21 and 315/70/17 Duratracks and it drives fine all around. I'm not sure how different 4:56 or 4:88 would be, but i'm not planning to regear at least until i want to. My milage is between 13(city)-16(highway)
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Old 10-12-2013, 12:17 PM   #14
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Whats your city/hwy mileage with the 4.56? Whats your jeep? Thanks
I do t know the individual MPG but overall is about 16.5 and getting better. 2dr Sport that isn't really a sport anymore! LOL
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Old 10-12-2013, 01:25 PM   #15
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13-14 mpg on the road just flat out sucks. My mileage is done by math not the jeeps comptor. Wish it was though cause the comptor is better mpg.

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