5.38 vs 5.13
JK Jedi Master
Joined: Jan 2008
Posts: 11,463
Likes: 165
From: Austin <--> Colorado Springs
Thread Starter
JK Junkie
Joined: Oct 2007
Posts: 2,361
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From: Montana
JK Jedi Master
Joined: Jan 2008
Posts: 11,463
Likes: 165
From: Austin <--> Colorado Springs
What information are you looking for that isn't already in this thread? You know that your rpm's and street driveability will be better. You know about the size consideration if you plan on bouncing through the rocks. A few have already indicated that moving from 5.13 to 5.38 was the right decision for them. (and I will x3 them, since I recently did the same swap). So... ? 
JK Junkie
Joined: Nov 2010
Posts: 2,261
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From: Whitefish,Montana
Originally Posted by nthinuf
What information are you looking for that isn't already in this thread? You know that your rpm's and street driveability will be better. You know about the size consideration if you plan on bouncing through the rocks. A few have already indicated that moving from 5.13 to 5.38 was the right decision for them. (and I will x3 them, since I recently did the same swap). So... ?
JK Enthusiast
Joined: Sep 2010
Posts: 148
Likes: 1
From: Highland, Utah
What information are you looking for that isn't already in this thread? You know that your rpm's and street driveability will be better. You know about the size consideration if you plan on bouncing through the rocks. A few have already indicated that moving from 5.13 to 5.38 was the right decision for them. (and I will x3 them, since I recently did the same swap). So... ?
The calibration with actual tire size, inflation etc makes the actual speed vs RPM a little tricky, I seem to be around 2800-3000 rpm at what my speedo says is 70mph, (depends if there is a hill or incline) in my opionion the superchips calibration of gears/wheels/speedo/shift points was the most effective in helping my JK run better than stock. I also like to run the 91 octane, although the other settings are similar. I see no reason you wouldn't be happy with the 5.38, some people do just fine with a small pinion
JK Junkie
Joined: Feb 2011
Posts: 2,818
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From: Folsom, CA
Thread Starter
JK Junkie
Joined: Oct 2007
Posts: 2,361
Likes: 0
From: Montana
What information are you looking for that isn't already in this thread? You know that your rpm's and street driveability will be better. You know about the size consideration if you plan on bouncing through the rocks. A few have already indicated that moving from 5.13 to 5.38 was the right decision for them. (and I will x3 them, since I recently did the same swap). So... ?
I just dont see how the 5.38 can be that much different than the 5.13. 100 rpms more cant be that much noticable.
JK Super Freak
Joined: Mar 2010
Posts: 1,006
Likes: 0
From: San Marcos, CA
