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Old 03-26-2012, 09:17 AM   #1
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Gears and Axles?

I'm just about to put a set of 285/75/17s on my 2008 4dr X unlimited. I don't know what axles I have how can I find out or tell if it's a 44 in the rear or a 35?

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Old 03-26-2012, 09:20 AM   #2
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It's a D44 rear. All JKs have D44 rears except a handful of 2007s.

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Old 03-26-2012, 09:25 AM   #3
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Awesome thanks, do u know if I should run a bigger ring and pinnion with the 33s?
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Old 03-26-2012, 09:30 AM   #4
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Originally Posted by Maso08Jk View Post
Awesome thanks, do u know if I should run a bigger ring and pinnion with the 33s?
"Should" is a relative question. Most folks run 33s with their stock gears, including me.

That said, if you've got an auto trans, you're terribly undergeared from the factory. The pre-2012 autos can put in 5.13s on their STOCK tires, and they'd have a much better driving experience.

With a manual (like I have), I can just leave it in each gear longer so my RPMs climb appropriately. Still, I'd have a better driving experience if I swapped in 4.56s.

If you can afford $1200 to $1800 to regear, it'd certainly improve your performance. So in that sense, sure you "should." But do you need it? No.
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Old 03-26-2012, 09:40 AM   #5
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I have a manual as well (only way to go) what it help maintain my MPG with a regear? I'm currently getting 20 MPG would love to keep that. And what if I were to run 4.88 or is that too much?
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Old 03-26-2012, 09:48 AM   #6
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I have a manual as well (only way to go) what it help maintain my MPG with a regear? I'm currently getting 20 MPG would love to keep that. And what if I were to run 4.88 or is that too much?
Possible, but unlikely.

Regearing can help the around-town miles, but running higher RPMs on the highway sort of cancels it out. Folks get varying results, but the general rule is that getting bigger tires reduces mpgs, it's just the way it is. Especially when the tires are heavier (which I bet they are) and your mpgs is exceptionally high (which yours is).

My entire 33" tire/wheel combo (which you can see here) probably cost about what you spent just for new tires, but is sufficiently lightweight that it was more or less mpg neutral. I was averaging about 18 before, and I'm getting about 18 now.

If you did regear, the right ratio depends a little bit on the RPMs you're comfortable with. For 33s and a pre-2012 manual, 4.88s would be a little high for me. You'd be at nearly 3000 RPMs on the highway at 70 mph in 6th gear. Plenty of power, but poor mpgs and you couldn't get to 80 mph before you started to approach 4k RPMs. I'd be looking to shift into "7th" all the time. So I'd do 4.56s if I were going to regear, but I'm not.

Take a look at this chart:

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Old 03-26-2012, 10:03 AM   #7
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Looks good I'll probably hold off on regearing then. Did you have to lift your jeep a little bit for the 33s?
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Old 03-26-2012, 10:08 AM   #8
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I'm getting the good gas mileage due to chip I put in it also added some horsepower and torque it was easy to install and really cheap about $65 at first it set of my check engine light but it now off and I have had no problems with it, you can notice the difference in take off and acceleration in a higher gear at higher rpms
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Old 03-26-2012, 10:15 AM   #9
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Looks good I'll probably hold off on regearing then. Did you have to lift your jeep a little bit for the 33s?
You can run 33s without a lift, but you'll rub your fenders if you flex the suspension offroad. You want at least 1" all around, and 2" to 2.5" is would be better.
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Old 03-26-2012, 10:18 AM   #10
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Ok thanks I was looking at the 2.5 zone suspension lift so I'll go with that.

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