5.13 vs 5.38

JK1

JK1

New member
I know Eddie posted this on the JK facts and questions
Q: What gear ratio should I be running with 37" Tires?
A: In order to bring your Jeep's performance back to stock, you will need to run 5.13 gears with 37" tires.

But when i look at the chart it says 5.38 are in the green for 37.... that being said my friends are also split on what gears to run:crazyeyes:.

info..2010 JKRU auto, I live in iowa (rolling hills and now with 35 and 4.10 gears it down shifts on every little hill or god fore bid there is any wind) i will be going to colorado to wheel 1-2 times a year pry wheeling 5 other times around here, i drive mine 40+miles for work everyday, I am installing 37 13.5 17 toyo on slabs this weekend (i may never go bigger than 37 but not gonna promise that :brows:lol) ...

I'm just trying to nail down my next purchase.:D

Thanks for the help in advance
Matt
 
wayoflife

wayoflife

Administrator
Staff member
5.38 is a good ratio to run with 37's but, it'll also be one that leaves you with a tiny tiny pinion which will be a weak point. Granted, when I did it, I was running 40's but, it didn't last long at all. I wouldn't go with anything bigger than a 5.13 in a Dana 44.
 
JK1

JK1

New member
wayoflife said:
5.38 is a good ratio to run with 37's but, it'll also be one that leaves you with a tiny tiny pinion which will be a weak point. Granted, when I did it, I was running 40's but, it didn't last long at all. I wouldn't go with anything bigger than a 5.13 in a Dana 44.
Click to expand...

that makes sense i didnt think of the pinion size:thinking: but will the 5.13 give me the same down shifting issue and having to run with the O/D off most of the time or will it be low enough to fix most these issues...
or do i just need to do a engine swap to a 6.2 to fix all of this ;)
 
wayoflife

wayoflife

Administrator
Staff member
JK1 said:
that makes sense i didnt think of the pinion size:thinking: but will the 5.13 give me the same down shifting issue and having to run with the O/D off most of the time or will it be low enough to fix most these issues...
or do i just need to do a engine swap to a 6.2 to fix all of this ;)
Click to expand...

So long as you properly calibrate your speedometer, your shift points should be on and the 5.13's will work just fine.
 
mrmet1983

mrmet1983

New member
You will like the 513s


I don't always wheel , but when I do I keep it tight......... Stay dirty my friends.
 
JKAnimal

JKAnimal

Caught the Bug
I had 4.10 in my Jeep and once I moved to 37s it was really sluggish. I have a manual so shift points weren't an issue but the RPMs were too low for my liking. Towing was a real PITA! Once I moved to 5.13 I honestly feel like the Jeep drives better on the highway than it did with the 4.10/32" combo. I am very satisfied with the 5.13s. It's great in 4 low also. :thumb:
 
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munstie

munstie

New member
I love the 5.13's in mine, but I'm also running 35's for now. And as mentioned above the 5.13's in low make a huge difference.

2011 JKU 3.5 R.E. Longarm lift.
 
Hyatt147

Hyatt147

New member
5.13s in my Rubicon, with 6 Speed and 37's ..... Love the combo, Wouldnt have it any other way

:drinks:
 
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