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Old 12-16-2011, 11:20 AM   #1
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Power / MPG loss with bigger tires

Ok, so my 2012 unlimited sport is only a month old and I already can't stand not having cool wheels and tires on it. After reading a bunch of threads on this site, it seems like the right size for a 4 door is 35" tires... ( it seems like the Dura Trac is the concensus favorite for a daily driver, which mine is)

My question is: How much power and mpg should I expect to lose if I put that big of a tire on my Jeep? I don't want to spend thousands of dollars and then hate it. Any opinions would be helpful!

oh, and I'm guessing I'll need 2 to 3 inches of lift to make them fit, is that about right?

Thanks in advance!

Terry

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Old 12-16-2011, 11:47 AM   #2
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I guess the first question to you would be do you have the 3.21 gears or the 3.73, It will make a difference.

After that I believe they say 2-3" for 35's... Others should chime in soon.

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Old 12-16-2011, 11:55 AM   #3
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I guess the first question to you would be do you have the 3.21 gears or the 3.73, It will make a difference.
Man, I know I'm going to take a beatin' for this, but,... how can I find out what my gears are?
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Old 12-16-2011, 12:19 PM   #4
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Quote:
Originally Posted by Terryhinsb

Man, I know I'm going to take a beatin' for this, but,... how can I find out what my gears are?
You can call the dealer with your vin # and they will tell u. There's also a web site for chrysler where you can request the build sheet, but I can't think of it
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Old 12-16-2011, 12:32 PM   #5
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Auto Sport = 3.73
Manual Sport = 3.21
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2013 JK - Lifted w/ 35s - Bilstein 5100s - Monster TB - Chopped Flares - Can't Keep It Clean
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Old 12-16-2011, 12:34 PM   #6
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Auto Sport = 3.73
Manual Sport = 3.21

I have the Auto, so I guess I'm 3.73. Is that good or bad? hahahaha
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Old 12-16-2011, 12:46 PM   #7
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The auto in your 3.6 2012 is a big step up on many areas from the auto in the 3.8. Most noticeably, you are going to feel it less when moving to a bigger tire as a result of the improvement in the engine design. The 3.73 works well for 32"-33" tires but your going to take a good hit moving to 35s with them. Stock Rubicon models come with 4.10 gears and would be tolerable to make the jump to a 35" tire without re-gearing. However, I believe most would still prefer to move to either 4.88s (manual) or 5.13-5.38 (auto) eventually. Your MPG and power are going to go down if you put them on with your current gears. Is it necessary to re-gear to do so? No. Do most prefer to re-gear when moving from 3.73 and an auto tranny to 35s? Yes.
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Old 12-16-2011, 04:52 PM   #8
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if its just a sport standard it should be 3.21s

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