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Old 03-28-2012, 04:05 PM   #1
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Gear conversion worth it??

Hey guys, I got my first jeep a couple weeks ago and have been falling deeper in love ever since. She's an '01 wrangler four banger with 66k miles, a 6" lift and 33" tires. As you can imagine she's a tad lethargic, slow and pretty bad in fuel (I think I'm getting about 10 mpg). I've been reading a lot and realize that a 4.88 ration would fix both of my concerns. Is it worth it the 1300$ or should I drop it a few inches and get smaller tires? I personally prefer the way it looks now but a jeep is a jeep no matter how tall right? What are your experiences and any advice is appreciated.
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Old 03-28-2012, 05:13 PM   #2
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Absolutely regear it. You'll regret it severely if you drop down in lift and tire size... because you just end up lifting it and putting bigger tires on it anyway when you get tired of it.

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Old 03-28-2012, 07:05 PM   #3
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Before you go and spend money on re-gearing (which I would also advise), determine what axles you have and ensure your choice of gears is compatible with the axels.
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Old 03-28-2012, 08:52 PM   #4
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With the proper gearing, do you imagine my mpg will go to stock? I'm not terribly
Worried about getting better mpg it's just nice not to have to fill up every 4 days haha.
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Old 03-29-2012, 12:28 AM   #5
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an 01 4cylinder will most certainly have the d30/d35 combo. so your right in wanting the 4.88s. i would certainly do that. as far as better mpg i can't say for sure. it will probably be better in town with more pep but on highway will be much harder to maintain highway speeds.
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Old 03-29-2012, 12:48 AM   #6
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This should help answer your ?'s
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Old 03-29-2012, 08:45 AM   #7
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This should help answer your ?'s
Is this chart for a 4 cyl? Thanks
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Old 03-29-2012, 04:32 PM   #8
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Quote:
Originally Posted by Miguedona21 View Post
With the proper gearing, do you imagine my mpg will go to stock? I'm not terribly
Worried about getting better mpg it's just nice not to have to fill up every 4 days haha.
The proper gears will definately help but will not get you back to stock economy. Reason being is even though you will have your mechanical leverage back after the re-gear you still have two big factors effecting you. One being frontal drag, now that you are lifted your Jeep has a larger frontal area which causes drag. Second factor is rolling resistance, due to larger tires more friction and more weight on the vehicle it will require more energy (ie fuel) to get that weight moving and keep it moving.

Will it improve your mileage over what you currently have now, more than likely, yes.

Nice looking Jeep by the way.

Mike.
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Old 03-29-2012, 07:38 PM   #9
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Another consideration is the power of the 4-cylinder pushing those wheels and drag. You're going to bog the engine down regardless. I'm running 35s and 4.10 in a I6. I actually like the balance of power and mileage and have no problem merging on the highway, but it's definitely less than stock.

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