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Old 12-11-2010, 04:11 AM   #1
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35s or 37s on DD????

hello i am going to lift my jeep and want to know what rides the best and if i should do 35s or 37s?
im new to jeeps and have a jeep wrangler unlimited mountain auto and want to put the 3.5 or 4.5 in AEV lift on it...
thanks cameron

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Old 12-11-2010, 04:57 AM   #2
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Either 35s or 37s are going to be a completely different feeling from what you have now. Question is, for your daily driver: Do you really need that much rubber? Putting a lot of miles on a jeep with that diameter with the kind of ride it will produce is something to think hard about before pulling the trigger. Another thing to ponder is: Can you also afford to regear? With that large a diameter, regearing will become a necessity for either size tire.

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Old 12-11-2010, 06:02 AM   #3
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You shouldn't go higher than 33's for a DD unless you also do extensive wheeling. You'll be hating life with 35's or 37's on the road as a DD. Your MPG's and performance will drop like a rock.
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Old 12-11-2010, 08:56 AM   #4
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Originally Posted by jk'n View Post
Either 35s or 37s are going to be a completely different feeling from what you have now. Question is, for your daily driver: Do you really need that much rubber? Putting a lot of miles on a jeep with that diameter with the kind of ride it will produce is something to think hard about before pulling the trigger. Another thing to ponder is: Can you also afford to regear? With that large a diameter, regearing will become a necessity for either size tire.
yes i will be regearing
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Old 12-11-2010, 08:59 AM   #5
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++ on JK'n and Daggo.

It's up to you how much you care about pick up and gas mileage, but just understand your Jeep will feel much less powerful than it does right now and get mich worse gas mileage. With 37s and an auto, I'd be surprised if you can keep it at 65 on the highway going uphill.

To get your power back, your going to spend probably 1500 on a regear. Factor in a few hundred more for a Superchip or a ProCal to fix your speedometer and shift points. Have you considered these issues?

Edit: Cameron answered about the regear while I was typing. Still consider the chips though . . .
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Old 12-11-2010, 09:16 AM   #6
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Don't forget new shocks/driveshafts/overheating tranny/spare/bumpers-

Probably TOTAL cost-$4,000 to $7000 bucks, 12 mpg-gonna be a great off-roader and a lousy DD !

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Old 12-11-2010, 09:26 AM   #7
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overheating tranny and bumpers?
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Old 12-11-2010, 09:27 AM   #8
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Don't forget new shocks/driveshafts/overheating tranny/spare/bumpers-

Probably TOTAL cost-$4,000 to $7000 bucks, 12 mpg-gonna be a great off-roader and a lousy DD !

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and what will make it a great DD?
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Old 12-11-2010, 09:35 AM   #9
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The tranny will be under a much greater "heat" load with the BIG tires and you'll need aux cooling, you'll need a new Swing away tire carrier/bumper, for your spare !!


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overheating tranny and bumpers?

If you want a GREAT DD--sellit and get a Prius, you can't make a JK a Great DD-except in your mind !!


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and what will make it a great DD?
I'm not being funny-this is FACT !

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Old 12-12-2010, 01:35 AM   #10
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You will also need to add or modify parts to meet state laws. Some states require a certain bumper height, mud flaps if more than half of the tires are exposed and wider fenders if the tires are wider than the stock fenders. I run 33's and I am guilty of the wide tires but I don't DD where the LEOs are watching. 35 and especially 37s will gain the interest of the LEOs.

I run my stock tires most of the time and swap out the 33s when I plan to go off road. The gas mileage goes from 20 mpg to 14 mpg with the 33s.
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Old 12-12-2010, 01:44 AM   #11
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You will also need to add or modify parts to meet state laws. Some states require a certain bumper height, mud flaps if more than half of the tires are exposed and wider fenders if the tires are wider than the stock fenders. I run 33's and I am guilty of the wide tires but I don't DD where the LEOs are watching. 35 and especially 37s will gain the interest of the LEOs.

I run my stock tires most of the time and swap out the 33s when I plan to go off road. The gas mileage goes from 20 mpg to 14 mpg with the 33s.
Are you accounting for the odometer error when you swap out the tires in those calculations?

It amazes me how many people fail to take that into consideration...just wondering if you have or not.
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Old 12-12-2010, 03:41 AM   #12
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Heck just trade it on a M-35.

You will get get better mileage, it'll ride better and I believe they come with 37's .........no wait thats 52's
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Old 12-12-2010, 12:03 PM   #13
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I've got a 2dr JK lifted on 35's. It's also my DD, automatic, with 4.10's.

I ended up superchipping it to regain power/acceleration. I also gained 1 MPG.

I have a front driveshaft issue related to it hitting my trans skid, but both my DS's are stockers. The boot has been torn months now. But I regrease it every 3,000 miles and it seems to be holding up well enough.

All in all, it's not bad. Biggest issue I have with a lifted JK on 35's as a DD is wander from such a wide tire, bumpsteep caused from sh*tty caster, and a hot transmission. I've added a nice little tranny cooler though, and the bumpsteer isn't bad. My Jeep is safe up to about 80-90mph as ling as you don't get fancy with the steering wheel.
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Old 12-12-2010, 12:26 PM   #14
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I have 35's on my JKU auto with 4.10 gears. It's my DD. 2" lift so no driveline issues. Cut my fenders to allow for the extra clearance. Added a superchips to recalibrate the shift points and speedometer. Performs as good as stock without mods and I kept my mpg about the same. I Added a trans cooler because I was getting some overheating issues off road. All is fine now.

FWIW, I had 33's on it 1st, and after a month went to the 35's. I just like them better.

I wouldn't go 37 unless I could afford to regear, which apparently you are going to anyway.

Anything above a 33 spare you'll need a reinforced tire carrier as the tailgate can't support the weight.

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