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Old 07-31-2013, 11:18 PM   #1
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Regearing...Looking for advice

I have an '08 X, where can I find on the vehicle what the gear ratio is? I believe it may have 3:21s. I am running 315 MTZs, so what would a more appropriate ratio be? Finally, how difficult is the process of changing out the gears? Thanks in advance for any help you can give me!

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Old 07-31-2013, 11:35 PM   #2
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If you have a manual you can have 3.21 or 3.73. The 3.73 was an upgrade option. If you have a automatic tranny then you have a 3.73.

I have 4.88's in mine and think they work great with my 35's

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Old 08-01-2013, 09:51 PM   #3
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It's a manual. Did you do your own work?
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Old 08-01-2013, 10:54 PM   #4
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If you log on to the Jeep website you can request a "build sheet" with your V.I.N. They will e-mail you the build sheet within a day.

I have a 2010 JKU automatic with 35's. I went with 5.13 gears. Changing the gears takes some tech experience. My advise would be to take it to a trustworthy shop who does gears.
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Old 08-02-2013, 12:34 AM   #5
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What were the improvements with the gear change? More power? Pick up from a stop? Pick up at speeds? Mileage?
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Old 08-02-2013, 10:33 AM   #6
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What were the improvements with the gear change? More power? Pick up from a stop? Pick up at speeds? Mileage?
All of the above...100 percent better drivability.
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Old 08-02-2013, 10:57 AM   #7
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Re-gear doesn’t give you more power as it has nothing to do with the engine. It does make the driveability 100% better. Lowere RPM, better MPG, less doggy at accel, so on…A 3.8L with manual would benefit from 4.88 gears for 35’s.

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Old 08-03-2013, 07:49 AM   #8
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Originally Posted by mountainneer View Post
If you log on to the Jeep website you can request a "build sheet" with your V.I.N. They will e-mail you the build sheet within a day.


I have a 2010 JKU automatic with 35's. I went with 5.13 gears. Changing the gears takes some tech experience. My advise would be to take it to a trustworthy shop who does gears.
Will do. Thanks!
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Old 08-03-2013, 08:00 AM   #9
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I used www.compnine.com for my build sheet. Worked great and everything was accurate. Click on the Try free demo.
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Old 09-10-2013, 07:38 AM   #10
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I have a 08 auto with 35"s but it's also my daily driver. Would 5.33 gear ratio be too much for toll road speeds?
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Old 09-10-2013, 07:50 AM   #11
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I went from an '08 with 3.21 to 4.11. The difference was dramatic, its like a totally different vehicle. RPM's are definitely higher than before but now I can actually use 6th gear on the highway.
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Old 09-10-2013, 08:49 AM   #12
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I went from an '08 with 3.21 to 4.11. The difference was dramatic, its like a totally different vehicle. RPM's are definitely higher than before but now I can actually use 6th gear on the highway.
How much higher? Auto or manual? I have an 08 with 3.21 gears (manual) on 33's. Considering either 4.10's or 4.56's. I do a mix of highway and stop n go street driving.
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Old 09-10-2013, 09:11 AM   #13
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How much higher? Auto or manual? I have an 08 with 3.21 gears (manual) on 33's. Considering either 4.10's or 4.56's. I do a mix of highway and stop n go street driving.
It's a manual. When I drive home today I will take down some RPM numbers at different speeds in all the gears so that you can compare it to yours. I am very happy with the 4.11 gearing and don't think I would go any higher unless I was considering putting on 37"s. Shifting is much different now, I find that i cruise around in a higher gear than I used to and 6th gear isn't completely useless anymore, I love it.
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Old 09-10-2013, 01:48 PM   #14
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I have a 08 auto with 35"s but it's also my daily driver. Would 5.33 gear ratio be too much for toll road speeds?
There's no 5.33. Do you mean 5.13 or 5.38?

3.8L, automatic, 35s, 4 door and I was still disappointed when I switched from 4.10s to 5.38s. Streetability didn't improve as much as I hoped, felt like I just got back my overdrive and 4:10 OD off drove better than 5.38 OD on around town.
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Old 09-10-2013, 11:02 PM   #15
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There's no 5.33. Do you mean 5.13 or 5.38?

3.8L, automatic, 35s, 4 door and I was still disappointed when I switched from 4.10s to 5.38s. Streetability didn't improve as much as I hoped, felt like I just got back my overdrive and 4:10 OD off drove better than 5.38 OD on around town.
Oh yea ha that's what I meant. With the above stats would I notice a difference from 3.71 to 4.10 or 5.13?
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Old 09-11-2013, 07:36 AM   #16
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How much higher? Auto or manual? I have an 08 with 3.21 gears (manual) on 33's. Considering either 4.10's or 4.56's. I do a mix of highway and stop n go street driving.
Here are the numbers I got last night comparing engine speed to road speed with 4.10 gearing. You should be able to use this to compare to your Jeep with 3.21 axle ratio.
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