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Old 10-17-2012, 11:32 PM   #1
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Lifts vs hp

Totally new to the jeep, have a 4 cylinder with a lot of miles. Will a couple inch lift and slight larger tires than stock take up a lot of my already limited HP?

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Old 10-17-2012, 11:34 PM   #2
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In my opinion yea, I have an inline 6 and it took a lot of power upgrades and regearing to get back my overdrive on the highway

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Old 10-18-2012, 07:20 AM   #3
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a little bit but if you gear the axles down you'll get a good amount of the power back
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Old 10-18-2012, 08:58 AM   #4
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It depends on how "slight" the difference is in tire size.

Once you start getting more than an inch or two difference you really want to start looking at re-gearing the axles, especially when you have a 4 cylinder.

The gear ratio in your axle is designed to work with your factory tire size. If you change one very much you really do need to change the other to compensate. In addition, as you go bigger, the tires get heavier and harder to turn (beyond just the diameter change) so you need to compensate a little more.

Try out my gear ratio calculator (Gear Ratio Calculator) with the factory tire size and the tire size you want to go to. You can try the available gear ratios with the new tires to get your RPMs and speeds to get close to the factory numbers. Then you have to decide whether it's worth the money to regear.

If you don't know what transmission or axle ratio you have (you probably have the NP231 transfer case if you have a Wrangler), post up what year and type of transmission you have (manual or auto) and people can tell you what you should have.
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Old 10-20-2012, 10:08 AM   #5
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Thanks a lot for the comments. It is a 95 with a stick.
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Old 10-20-2012, 11:41 AM   #6
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That's the Aisin Warner AX-15. I don't remember the factory axle ratio off the top of my head but I think it's something like 3.07

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