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Old 07-28-2009, 03:35 PM   #1
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Tire Size Recommendations

Okay, I'm doing some tire/rim shopping and have a question. I'm not sure if I'm going to put 31" BFG A/T's without a lift, or if I'm going to go a little bigger. I realize for anything bigger I'm going to need a lift, but at what size tire will my 4.0 (w/auto) seem to lose power?

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Old 07-28-2009, 03:40 PM   #2
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What model year TJ do you have? That makes a difference where your automatic transmssion is concerned.

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Old 07-28-2009, 03:43 PM   #3
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1998 Sahara.
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Old 07-28-2009, 03:44 PM   #4
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Everything is stock to my knowledge. I'd consider some easy/inexpensive mods for the engine, but that's a whole 'nother topic.
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Old 07-28-2009, 03:47 PM   #5
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Oops one more question, what axle ratio does your TJ have? It's either 3.07 (bad) or 3.73 (good) and that info can be found embossed into a steel tag located between two bolts at the 9 o'clock position holding your axle's differential cover to the axle. Take a rag with you to wipe the dirt off and a flashlight so you can read the faint embossing. It'll have either "3 07" or "3 73" embossed into it among some other numbers.
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Old 07-29-2009, 09:28 AM   #6
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I have 3.07's
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Old 07-29-2009, 09:56 AM   #7
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My best friend ran 32X11.50 Goodyear MTR's with no lift. He had a set of aluminum wheels with 4.5" offset I believe. He did more bashin it the woods and mud than rock crawling and never disconnected the sway bars and never had rubbing issues. This is the only pic I could find of it. 32's are possible. And, if you do add a lift later on, you wont have to buy new tires for awhile because 32's will look fine.

Before the lift


After the 3" lift
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Old 07-29-2009, 12:43 PM   #8
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I personally wouldn't go more than 32's with you gearing..It all depends what you want to do. Maybe regear and thow on a 2" lift with 32's. That's what I used to have and it worked well with 3.73 gears. Now I have 33's still on 3.73 and there is a loss in power but not bad. I will regear though at one point.
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Old 07-29-2009, 01:04 PM   #9
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3.07's and 32's fine on flat ground, you get in to the hills your gonna want different gears.

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