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Old 05-18-2011, 05:05 AM   #1
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tire question

I have a 2009 wrangler 4 door with a 3in lift. Can I run 38/15.5/18 nitto mud grapplers with stock axles, drive shaft & 4.88 gears or will it kill power & gas mileage

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Old 05-18-2011, 06:22 AM   #2
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I definitely wouldn't think about it.

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Old 05-18-2011, 07:21 AM   #3
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NOPE won't work for very many STRAIGHT MILES-

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Old 05-18-2011, 07:26 AM   #4
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Pretty sure the stock axles are your weakest point, so they should be addressed, as well as I would think you'd need bigger brakes to stop that amount of rolling mass.....
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Old 05-18-2011, 07:37 AM   #5
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There are definitely people that run tires that big on stock axles. You'll need new wheels obviously. Eventually it's likely to cause axle problems, but knock yourself out.

BUT, will it kill power and gas mileage?? Absolutely on both. I'm thinking you'll be down to single digit gas mileage until you regear. At that point, low teens. Power until you regear will be intolerable. Im guessing third gear on the highway if you've got a manual. Worse if it's an auto.
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Old 05-18-2011, 10:03 AM   #6
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What about 37 inch tires
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Old 05-18-2011, 10:51 AM   #7
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What about 37 inch tires
36 is big enough. Trust us.
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Old 05-18-2011, 12:14 PM   #8
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There's a chart floating around showing appropriate regearing ratios. Just make sure you get the right gears for your tire size. You'll be fine so long as you do the mechanics right in terms of gearing, lift and trackbars etc., wheel backspacing, and--perhaps eventually--axle reinforcement.

But yes any bigger tire will adversely affect your gas mileage, that's just the way it is. And when your talking about going beyond 35s it's going to be a big hit as compared to the 32s you're on now.
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Old 05-18-2011, 02:19 PM   #9
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Just wondering, why do you think you need 37 inch tires?

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