JK-Forum.com - The top destination for Jeep JK and JL Wrangler news, rumors, and discussion
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JK-Forum.com - The top destination for Jeep JK and JL Wrangler news, rumors, and discussion (https://www.jk-forum.com/forums/)
-   Modified JK Tech (https://www.jk-forum.com/forums/modified-jk-tech-2/)
-   -   2012 Rubi build...37's with 5.13 or 5.38 gears?? (https://www.jk-forum.com/forums/modified-jk-tech-2/2012-rubi-build-37s-5-13-5-38-gears-233222/)

kgw350 05-24-2012 05:26 PM
I had 5:13 installed in my 2012 with 37s i pull my pontoon boat in the summer. Have yet to pull it though its going through a makeover.

JKLarson 05-24-2012 06:33 PM
Originally Posted by kgw350
I had 5:13 installed in my 2012 with 37s i pull my pontoon boat in the summer. Have yet to pull it though its going through a makeover.
How's your performance compared to stock? MPH difference?

JKLarson 05-24-2012 06:40 PM
MPG sorry...

GarrettPatton 05-25-2012 08:11 PM
I have a 12 and I'm running 35's w/3.73's and my mpg sucks! Still haven't totally corrected my speedo though but my jeep get 12.5 mpg's auto trans

grandpa jeep 05-25-2012 10:06 PM
4.88to 5.13 no higher than that

JPop 05-26-2012 05:06 AM
Originally Posted by GarrettPatton (Post 3035931)
I have a 12 and I'm running 35's w/3.73's and my mpg sucks! Still haven't totally corrected my speedo though but my jeep get 12.5 mpg's auto trans
You need to calibrate your speedometer for proper shift points. Without it you will have poor efficiency and also you are driving more miles than your odometer indicates.

JPop 05-26-2012 05:08 AM
Originally Posted by grandpa jeep (Post 3036037)
4.88to 5.13 no higher than that
I concur. 4.88s will give you enough juice to cope with the mountain passes and 5.13s would be a steeper performance gear set for your locale.

TexasT 05-26-2012 06:16 AM
5.38's on my 12 JKUR With 37's and love it. 80 MPH at about 3K RPM's. MPG isn't great at around 12 but if I was looking to be economical I wouldn't drive a jeep.

TexasT 05-26-2012 06:35 AM
Originally Posted by matzjeep (Post 3036313)
If you were looking be economical you wouldn't be blasting around at 80 either. 12mpg? LoL
I drive it like I stole it! Lol:rock:

Bypass 11-23-2012 04:13 PM
Originally Posted by TeraFlex (Post 3033544)
Running 37's with 5:38's in mine. Makes it nice on climbing up hills, lots of bottom end. However not the best for mpg's, I'd consider 4:88's -5:13's. However there is no way I would ever change mine down.
its an unlimited? How does it do on the highway at say 75 or so? On overpasses and gradual hills, does it hunt a bunch or is the power there?


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