What Gears should I use? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 16 Old 02-01-2010, 11:28 AM Thread Starter
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What Gears should I use?

Ok I am thinking of changing my gears and need help with deciding what gear to go to.


2008 Rubicon
37" Tires
Automatic
4" Lift
Stock 410s
Do I go with

5:13s
or
5:38s

And why? What will I gain?

2008 JK Rubicon 4" Lift
37" x 12.5 x 18s
LOD Offroad Bumpers and Rails
Back up Camera
Nav/Dvd
Smitty Built Winch


It's a Rock Get Over It!!!

Last edited by Highrlr; 02-01-2010 at 11:31 AM.
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post #2 of 16 Old 02-01-2010, 11:35 AM
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There is a good chart in the second post here:

http://www.wranglerforum.com/f33/rpm...mph-43490.html

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post #3 of 16 Old 02-01-2010, 12:09 PM
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I have an auto with 37s and 5:13s im happy with them

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post #4 of 16 Old 02-02-2010, 08:12 PM
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5.38s all the way. you will be just a tad over geared but that equates to more power.

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post #5 of 16 Old 02-03-2010, 07:00 AM Thread Starter
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I have been told 5.13s will be stronger. Sell me on 5.38s. tell me why I want 5.38s

2008 JK Rubicon 4" Lift
37" x 12.5 x 18s
LOD Offroad Bumpers and Rails
Back up Camera
Nav/Dvd
Smitty Built Winch


It's a Rock Get Over It!!!
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post #6 of 16 Old 02-03-2010, 07:09 AM
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I went with 5.38's on 35's and ww is right, just a tad over geared but I like the fact that I can go down the road and hold whatever rpm I choose to drive at (except on mountain highways of course). We drive at 4000' elevation to 9000'. I also plan on going 37's later.
Do a search on this forum and you will find several threads on gearing which might help you decide what is best for you.
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post #7 of 16 Old 02-03-2010, 07:14 AM Thread Starter
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Please understand this is an every day driver. And as you can see by the pictures we wheel it all the time. I'm getting ready to drive out to Moab Utah. What will 5.38s do to my gas mileage compared to 5.13s. Oh and I am sitting on 37s.

2008 JK Rubicon 4" Lift
37" x 12.5 x 18s
LOD Offroad Bumpers and Rails
Back up Camera
Nav/Dvd
Smitty Built Winch


It's a Rock Get Over It!!!
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post #8 of 16 Old 02-03-2010, 08:55 AM
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Highrlr, you're driving out to Moab??? man, what you gonna do if the unthinkable happens? you gonna leave it out there for repairs and fly back and forth to pick it back up???
Remember last summer at the Badlands? I had to call my buddy from up here to come and get me with his trailer after snapping my axle....
This year, I have a trailer for those weekends I know I will be pushing it!!!
I don't know, maybe I'm just paranoid, but it is a thought....
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post #9 of 16 Old 02-03-2010, 09:24 AM
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I went with 5:13s when i put on 35s. I found that it was a little too much gear. When i went to 37s, it is much better. I would think that 5:38s with 37s would be about like 5:13s with 35s (im sure some smarty pants will correct me if im not 100% technically correct). I would think that if you live in CO, or some place where you gotta drive in the mountains, 5:38s would be good. If its your every day driver and live where its flat, 5:13s would be better.

Dex has a great point. I wouldnt drive my rig 3 hrs away to wheel, much less halfway across the country. That far from the house, im trailering my junk.

corey d

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2008 JEEP...

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post #10 of 16 Old 02-03-2010, 10:12 AM Thread Starter
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Well as you can see from my pictures. I went last year and had a great time. I don't drive to tear things up. I feel if I can't get over something i'm not gonna ram it. I drive easy. But I do understand what your saying.

2008 JK Rubicon 4" Lift
37" x 12.5 x 18s
LOD Offroad Bumpers and Rails
Back up Camera
Nav/Dvd
Smitty Built Winch


It's a Rock Get Over It!!!
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post #11 of 16 Old 02-03-2010, 03:40 PM
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Quote:
Originally Posted by Highrlr View Post
Well as you can see from my pictures. I went last year and had a great time. I don't drive to tear things up. I feel if I can't get over something i'm not gonna ram it. I drive easy. But I do understand what your saying.
I'm not saying you drive it to bust it up!!! (don't forget I wheeled with you last year)
I'm just saying that speaking for myself, I believe I would trailer out there just on the chance something did happen (busted axle, twisted shafts, rip out the transfer case, or God forbid a rollover!)
Peace of mind kinda thing you know......
Not to mention you can pack a hell of allot more stuff inside the back of a pick-up truck than you can in the jeep, then you would have room to take extra axles and maybe a drive shaft along with tools and everything else.....
But that's just me...

Last edited by Dex1; 02-03-2010 at 03:43 PM.
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post #12 of 16 Old 02-03-2010, 03:49 PM
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John, I am running 5.13s in a 2dr auto. with Nitto mud grapplers. 5.38s for a 37 in tire on a unlimited rubi. the extra weight will play a part in your overall performance and mileage. I think that my rig is over geared but just a little in kinda the grey area 4.88s would have been undergeared. IMO I would rather be over geared and not need it, than to be under and
fuckin hate it because I spent all that money to do them in the first place. now my nittos measure
33 7/8 if they were true 35s then I believe that my combo would be perfect.
you gas mileage will be worse if you under. but its your nickel. thats the price we pay to play.

and hey stupidface

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post #13 of 16 Old 02-03-2010, 04:32 PM
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5.38 with the V6 and 5.13 with the Hemi. I run 2000 rpm at 60mph.

2014 Rubicon on the build!
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post #14 of 16 Old 02-03-2010, 07:47 PM
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Quote:
Originally Posted by woodweavil View Post
and hey stupidface
Back atcha peckerwood....

corey d

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2008 JEEP...
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post #15 of 16 Old 02-03-2010, 09:57 PM
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Quote:
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Back atcha peckerwood....

corey d
LMAO!!! you alright for a coonass!!!

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post #16 of 16 Old 02-05-2010, 11:11 AM
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i am in the same situation as you. i currently have 4.10 with my 35's and i am ok with the power. i will move up to 37's soon and i am not sure of the gears i want yet.

can anyone show me a post anywere on the internet that 5.38's have failed?

even if you can i belive it can be from installation of the gears wrong. i am sure you can find some post's that 5.13's have failed as well.

as far as over geared we are only talking about less than a couple hundred rpm differece with the same size tire anyway. so rpms would not even be my determining factor with 5.13 or 5.38's and 37 inch tires.

i think it is kinda like the bent axles. i have only seen a few broken one's not bent. but i think that broken warrents a sleeve tho even if it is only on a few production runs of the axles. better safe than sorry on that.

2010 Rubicon unlimited / rock krawler long arm
ome +40 long travel lift / 17 spyderlocks / 38 bfg km2's/ 5.38 gears/ sleeves
poison spyder customs crusher flares/ body armor/ diff covers/rocker knockers
lod stubby ftont and rear/ evap skid/ coast driveshaft 1310/ rcv & superior axle shafts
warn powerplant / aev drag link flip/ currie tie rod/ reid knuckles, prosteer ball joints
c2 gussets and lca skids/ rock stars/ speed bumps/ rk tranny pan/ redneck ram hydro assist
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