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Old 03-23-2015, 05:39 PM
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Regear

So I currently have a 4.0L 99 sport with 3.07 Gears and 31 inch tires. I still have some life left in my tires, about 20k miles it looks like, but once they are lower, I will swap to 33s and a zone combo lift. I know I'll get a new adjustable track bar with the lift, but money is a factor. So my question is, what order should I buy everything. Should I buy the lift first, then tires then regear, or what?

With 31s im already not doing to great on the highway and was thinking about rehearing first. If I were to regear then get the lift then tires, would the 4.56 gears be okay with my 31s? Also, it is a DD but I offroad a bit and im a high schooler so I will be off-roading more and more.

Would 4.56 be good to regear to or would 4.10s be more ideal for my purpose? And back to the main question, what order should I buy everyhitng in and if I regeared first, how would the new gears be with my 31s?

Thank you

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Old 03-23-2015, 05:46 PM   #2
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If your TJ has the 5-speed manual transmission, 4.56 would be optimal for your 33's. 3.07 would be pretty miserable with 33's so I'd definitely regear either before or right after you get the 33's. The lift needs to come before the 33's or they'll rub. Your TJ would definitely be zippy around town with 4.56 and 31's, highway RPMs would be over 3,000 RPMs.

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Old 03-23-2015, 07:59 PM   #3
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I know there is a way to look at a tag to see what the gearing is, but it looks like my tag is ripped off. Can you tell the gearing by looking at the VIN somehow? I'm going to be having mine up on jacks in a couple of weeks so I'll be able to spin the wheels and find out, just wondering how much the VIN tells you.
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Old 03-23-2015, 08:34 PM   #4
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The factory installs a tag on both axles, look on the other axle at the 9 o'clock position of the differential cover.

This tag indicates a 3.73 axle ratio.

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Old 03-23-2015, 09:59 PM
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You can also email Chrysler with your VIN asking for a build sheet, it's pretty nice.
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Old 03-23-2015, 11:09 PM   #6
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Old 03-24-2015, 07:40 AM   #7
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I know how tempting it can be to install stuff as soon as you get it. That being said, why not install it all together. Buy your lift and tires, get your gears and other parts together and do it all at once.
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Old 03-25-2015, 01:08 AM   #8
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Let me just throw this out there- you can drive the thing as long as you want without regearing. Decide for yourself when you're ready to do that. It does make a big difference, but it's not like you can't drive it without it. Do the lift and tires together if you can. Then decide if you want to do the gears immediately or not. Might want to wait and do the lift and tires until you can do the gears too if you decide to.

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