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Old 06-01-2011, 12:12 AM   #1
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'05 Rubicon, required lift & max tire size question

I have an '05 Rubicon and want to increase the tire size to 33 x 12.5. Do I need a lift to accomodate those tires and how much do I need. Is there a chart that shows me those details?

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Old 06-01-2011, 12:16 AM   #2
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You need a four inch lift

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Old 06-01-2011, 12:25 AM   #3
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If you want to fit 33x12.50R15's you'll need more lift and more bumpstop extension.

Typically 33's are fit in two ways:
1. 4" of lift, with 2" front and ~2.5" rear bumpstop extension, with a CV shaft.
2. 2.5" of lift, with a 1" BL, with 1" front and ~1.5" rear bumpstop extension, with a MML + small t-case drop.

Bumpstop extension height needs to be taylored to your shock length and tire size, on your rig...those numbers are just estimates.
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Old 06-01-2011, 12:26 AM   #4
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Do you have after market 15in rims cause if not you can't get a 33x12.5 in a 16in rim.. You have to find the closest metric size.. And that would be either a 285/75/16 (33x11.5) or 305/70/16 (33x12).. On both of those if you keep the stock moab rims then you will need a proper rim spacer or else you will rub however with that said with the 285's I have know some people to not rub at full lock on that tire..

As to lift height.. Anywhere between 3-4in will work good for what is essentially a 33. IMO probably best looking into a 2.5 sl with a 1-1.25 bl with a 1in mml.. that way you can run a tt if you want in the future
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Old 06-01-2011, 12:28 AM   #5
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Quote:
Originally Posted by UnlimitedLJ04 View Post
small t-case drop.
05 Rubicon so no need for a T case drop or sye
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Old 06-01-2011, 08:48 AM   #6
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Quote:
Originally Posted by XJ Knight View Post
05 Rubicon so no need for a T case drop or sye
No, although the Rubicon came with a fixed flange output, it has a SINGLE CARDAN rear driveshaft. The stock driveshaft is slightly longer than the NP231's Slip Yoke Equipped driveshaft, but the 1330 u-joints have less flexibility than the 1310s, so a Rubicon is still succeptable to driveline vibes in much the same way an NP231 is. You still need to add a DOUBLE CARDAN driveshaft.

Don't understand? Read this:
What is a CV shaft and why do I want one? - JeepForum.com

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