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Topic Review (Newest First)
09-11-2013 07:36 AM
Nickdoesabodygood
Quote:
Originally Posted by Jeep757 View Post
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.
09-10-2013 11:02 PM
TreyJK
Quote:
Originally Posted by TRAUMAhead View Post
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?
09-10-2013 01:48 PM
TRAUMAhead
Quote:
Originally Posted by TreyJK View Post
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.
09-10-2013 09:11 AM
Nickdoesabodygood
Quote:
Originally Posted by Jeep757 View Post
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.
09-10-2013 08:49 AM
Jeep757
Quote:
Originally Posted by Nickdoesabodygood View Post
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.
09-10-2013 07:50 AM
Nickdoesabodygood 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.
09-10-2013 07:38 AM
TreyJK 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?
08-03-2013 08:00 AM
shrwud96 I used www.compnine.com for my build sheet. Worked great and everything was accurate. Click on the Try free demo.
08-03-2013 07:49 AM
ResQJK
Quote:
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!
08-02-2013 10:57 AM
Daniel_M 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.

-Dan
08-02-2013 10:33 AM
mountainneer
Quote:
Originally Posted by david.w.johnson View Post
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.
08-02-2013 12:34 AM
david.w.johnson What were the improvements with the gear change? More power? Pick up from a stop? Pick up at speeds? Mileage?
08-01-2013 10:54 PM
mountainneer 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.
08-01-2013 09:51 PM
ResQJK It's a manual. Did you do your own work?
07-31-2013 11:35 PM
rics1997 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
07-31-2013 11:18 PM
ResQJK
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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