rear end gearing - : Jeep Wrangler JK Forum
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post #1 of 3 Old 10-10-2011, 06:31 AM Thread Starter
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rear end gearing

I have a question regarding rear end gearing. I have a 07 JK X. It's lifted 2'' and I'm running 35'' tires on it and I'm getting about 19.5 in gas mileage (babying it) I'm looking to try to get a bit more torque out of it. It has a hard time pulling anything or going up hills on the highway without dropping a gear. It is a manual but I'm wondering if I can just buy a set of gears for the rear end that will give me some more torque and it will just fit in the factory housing and work with the factory axles? I'm not familiar with gearing so if I'm way off on my idea please let me know. Thanks for your help
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post #2 of 3 Old 10-10-2011, 07:07 AM
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You can indeed replace your gears (or likely have someone else replace your gears), however, you need to replace them in front & back at the same time. Both axles must be the same.

I have an 08 Rubi Unimited with an automatic. I bought the Jeep in late 09 and discovered that while the original owner had put 35" rubber on it he had not changed the gearing. The Jeep drove fine but lacked any real muscle. I did some homework and ended up changing out the stock gears for 5.13s. BIG IMPROVEMENT. I will also be changing out the tires for 37s or 38s this coming Spring.

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post #3 of 3 Old 10-10-2011, 07:21 AM
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To use 4x4 both axle ratios need to be the same.

To answer your specific question, yes you can run just a different rear gear ratio. However you MUST NOT use 4x4 or expect severe transfer case problems. Basically remove the front driveshaft to avoid accidental engagement. So being you can run a different ratio, doesnt quite mean you "should".

A superchips running the tow tune on a manual will help slightly for holding a gear longer, still with 87 oct. However not even close to a comparison with a different axle ratio.

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