New to re-gearing - JeepForum.com

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post #1 of 47 Old 03-14-2016, 05:52 PM Thread Starter
Dtperrell
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New to re-gearing

So I searched through a couple of threads and couldn't find the information I was really looking for.
I've never done any gear work so I'm very new to all of this but I feel like my 08 2D JK needs to be re-geared for the 35's that are on it. It's pretty sluggish while city driving and when on the highway it never fails to lose speed when taking on hills. Any help would be great, I'm pretty eager to learn about all of this.


2008 JK on 35's
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post #2 of 47 Old 03-14-2016, 06:24 PM
Digger838
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So what are some of your question?
And a little more info in your rig goes a long way.
I'm no expert but have learned a lot in the time I've been on here.
So WHEN I regear with my set up ( 3.6, 6speed, 3.21factory gears) I will be getting front and rear e-lockers, 4.56 gears, and some structural support for my Dana 30 from axle.
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post #3 of 47 Old 03-14-2016, 06:53 PM Thread Starter
Dtperrell
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Quote:
Originally Posted by Digger838 View Post
So what are some of your question?
And a little more info in your rig goes a long way.
I'm no expert but have learned a lot in the time I've been on here.
So WHEN I regear with my set up ( 3.6, 6speed, 3.21factory gears) I will be getting front and rear e-lockers, 4.56 gears, and some structural support for my Dana 30 from axle.
3.8 v6, 6-speed manual, 35 in tires, 3.5 rough country lift kit, haven't checked the gear ratio yet but I'm fairly sure its stock. I'll try and get some pictures of my front and rear end you probably know how to identify them better than me. I just want to know where I should start if I want to re-gear it for daily driving. I do a little offroading but honestly not enough to need anything crazy. I've seen all kinds of terms thrown around that I don't really understand. I know about the ring and pinion gear and how they work but not much past that.

2008 JK on 35's
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post #4 of 47 Old 03-14-2016, 06:56 PM
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figure what rpm you like and see what matches with this...
2200 is usually pretty nice on the highway.

http://www.grimmjeeper.com/gears.html
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post #5 of 47 Old 03-14-2016, 07:47 PM Thread Starter
Dtperrell
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Got some pictures of the rear end and front end.
Attached Thumbnails
Rear end.jpg   Front end.jpg   Front end2.jpg  

2008 JK on 35's
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post #6 of 47 Old 03-14-2016, 07:54 PM Thread Starter
Dtperrell
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Quote:
Originally Posted by billiebob View Post
figure what rpm you like and see what matches with this...
2200 is usually pretty nice on the highway.

http://www.grimmjeeper.com/gears.html
This is somewhat embarrassing but I have no idea what transmission and transfer case I have...

2008 JK on 35's
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post #7 of 47 Old 03-14-2016, 08:20 PM
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Somewhere on here or on quadratec's web site are gear charts that will give you what you seek. Do you have an automatic or manual? It makes a difference. You will need 4.88 gears or somewhere around that to make for a much better Jeep.

Just Hunt!
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post #8 of 47 Old 03-14-2016, 08:47 PM
Digger838
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So as of axles, I've herd of 2007's with Dana 35 rear rears and Dana 30 front, all 08+ have a Dana 44 rear, and a Dana 30 front (sport,Sahara, Moab,exc.) Rubicons have both Dana 44 front and rear, options for gears would be 3.21,3.73(that I know of) and 4.10(rubicon)
I can't distinguish by eye the difference cuz I'm not that good haha

You can request a build sheet of your jeep from JEEP using your VIN#
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post #9 of 47 Old 03-14-2016, 08:54 PM Thread Starter
Dtperrell
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Quote:
Originally Posted by Xatten View Post
Somewhere on here or on quadratec's web site are gear charts that will give you what you seek. Do you have an automatic or manual? It makes a difference. You will need 4.88 gears or somewhere around that to make for a much better Jeep.
6-speed manual

2008 JK on 35's
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post #10 of 47 Old 03-14-2016, 09:25 PM
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http://www.decodethis.com/blog/6-vin_decoder

It said its a vin decoder I didn't try it maybe someone has or will, I got it from another forum
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post #11 of 47 Old 03-15-2016, 08:55 AM
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Quote:
Originally Posted by Dtperrell View Post
This is somewhat embarrassing but I have no idea what transmission and transfer case I have...
NSG370 (close ratio 4.46:1 first gear) transm and NVG231 Transf.
Rubicon uses NVG231 4:1 Transf

J Wm Bishop EA, ASADE
The wagon should, of course, be as light as possible, but strength should not be sacrificed to lightness, for on any but the regularly traveled roads, the wagon will get many a
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post #12 of 47 Old 03-15-2016, 09:10 AM
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ooops !


Quote:
Originally Posted by jwmbishop View Post
NSG370 (close ratio 4.46:1 first gear) transm and NVG231 Transf.
Rubicon uses NVG231 4:1 Transf

The Rubi uses the NV241OR (4:1) for the xfer case -


Whatever-


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post #13 of 47 Old 03-15-2016, 09:26 AM
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Use the VIN decoder or just call the dealer. They can run the VIN and see what gears came in there. Sometimes there is a tag on the axle but that is the only way. You can't look at the diff and tell. We need to start there. If you have 3.21's you will need a new carrier in the front. If you don't have a Rubicon, you will have a D30 front and a D44 rear. 3.21's or 3.73's were the most common option. Some years, you could do the towing package and get the 4:10's but none of that really matters as long as you don't have the 3.21's.

Let us know if we can help. We have a gear package with a master install kit (comes with new bearings and all). It is the way to go when doing gears:
http://www.krawloff-road.com/product_p/gearmaster.htm

-Jason


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post #14 of 47 Old 03-15-2016, 11:19 AM
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Originally Posted by JIMBOX View Post
ooops !





The Rubi uses the NV241OR (4:1) for the xfer case -


Whatever-


JIMBO
oops. brain fart.

J Wm Bishop EA, ASADE
The wagon should, of course, be as light as possible, but strength should not be sacrificed to lightness, for on any but the regularly traveled roads, the wagon will get many a
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post #15 of 47 Old 03-15-2016, 11:24 AM
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Heh Heh, my wife complains about mine--ALL THE TIME !


Wait, were we talking about the brain ?


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