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Old 03-16-2015, 09:04 AM
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Tire size

Hello, question.... I have an 09 jk with a full 4" rough country, bushwacker flat flairs and RC front bumper. Going to buy wheels and tires, can I get 38" under it and what backs spacing do I need , I don't mind if the stick out some? I am not afraid to cut, I'm a body guy, just need to know what and how much needs cutting.

Any help is greatly appreciated !!

Thanks
RJ

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Old 03-16-2015, 09:06 AM   #2
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You need a lot more than cutting to run 38s on a D30 with the anemic 3.8 engine. I also would not go that tall on a 2 door nor that much lift - it will be a rollover just waiting to happen on your first trail.

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Old 03-16-2015, 10:16 AM
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It's a four door unlimited... Sorry to confuse...
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Old 03-16-2015, 11:06 AM   #4
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A 4 door can do that height a little easier. But before you consider huge tires, consider regearing and trussing, c gussets, ball joints, drive shafts, axle shafts, hydroassist steering. It is going to be very expensive. Maybe even a new front axle for 38s. What is your budget?
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Old 03-16-2015, 11:18 AM
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Not that big at this point. Where I live there is no rock crawling, more show than GO !! Maybe some light off roading. If you think it's more feasible than I will just run 35's... Just want it to look intimating !!
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Old 03-16-2015, 11:21 AM   #6
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4" & flat fenders is enough lift to fit 38's. The width will determine the amount of BS you need.

Things to make it "right" now that you're adding a heavy tire:
C gussets
Truss and/or sleeves
Ball Joints
Gears
*if you're thinking about a locker then add it at that time too

The bigger tire will really fill the wheel wells. If you're lift geometry is correct it won't an issue, if you don't have control arms or relo brackets then it will be an issue.


BIG BIG BIG difference in running 38s compared to 35s... BIG!!!
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Old 03-16-2015, 11:28 AM   #7
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Quote:
Originally Posted by Sampson97 View Post
Not that big at this point. Where I live there is no rock crawling, more show than GO !! Maybe some light off roading. If you think it's more feasible than I will just run 35's... Just want it to look intimating !!
You can make a bad azz looking rig on 35s for sure.
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Old 03-16-2015, 11:36 AM   #8
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I agree with MMC. Running 38's on a D30 + 3.8 is not a good idea. You really need to max out the gear ratio for reasonable street performance which leaves you with a brittle ring and pinion and you can readily apply a lot of torque with the large tires.

IMO, you are better off with 35s. Given you have 4" lift and want 38's you don't seem too concerned about gas mileage, so add instead of large add a set of wider and aggressive MT tires. It will look and sound plenty intimidating.
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Old 03-16-2015, 11:37 AM
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No trimming required for that I assume ?

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