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BillTheCat
03-23-2015, 01:00 PM
Below is part of the build sheet for my Jeep. Newbie but loving this site.

Q1. I was under the impression the JKRU came with 4.1 Axle ratio, but mine appears to be 3.73
Q2. What is 4:1 Rock-Trac HD Part Time 4WD Sys? The "Part Time" confused me.

DGJ 5-Speed Auto W5A580 Transmission
DHWS 4:1 Rock-Trac HD Part Time 4WD Sys
DJSS Next Gen. Dana 44 HD Front Axle
DMES 3.73 Rear Axle Ratio
DRZS Next Gen. Dana 44 HD Rear Axle
DSES Tru-Lok Front & Rear Axles
ERB 3.6L V6 24V VVT Engine

mattfl
03-23-2015, 01:02 PM
Starting in 2012 4.10 gears had to be specifically ordered on Rubis.

The 4:1 is your transfer case

07JKSahara
03-23-2015, 01:04 PM
Part time is because it's selectable. You can choose 2 or 4 wd. Think Audi for full time 4wd...

BillTheCat
03-23-2015, 01:09 PM
Starting in 2012 4.10 gears had to be specifically ordered on Rubis.

The 4:1 is your transfer case

Can gears be changed or do you have to replace the entire axle?

JAGS
03-23-2015, 01:10 PM
Like Mattfl said, the 4.10 come with the max tow upgrade package. Well...that was the name of it if jeep didn't change it.

Here's a vid on rock trac system. Should help you understand. It was helpful for me when I first started learning.

http://youtu.be/K6uAKtb0Q6U

Canvas JK
03-23-2015, 01:12 PM
Can gears be changed or do you have to replace the entire axle?

Yes the gears can be changed and depending on where you are will determine the cost. What size tires are you going to run.

JAGS
03-23-2015, 01:12 PM
Can gears be changed or do you have to replace the entire axle?

Yes, you can change just the gear ratio, and you'll want to do so if you go to larger tires, such as a 37. You could probably live with 3.73 with 35s for a while.

JAGS
03-23-2015, 01:13 PM
Yes the gears can be changed and depending on where you are will determine the cost. What size tires are you going to run.

Good morning quick draw. Lol. 😂😂

Canvas JK
03-23-2015, 01:15 PM
Good morning quick draw. Lol. 

I was just thinking you are up rather early. I have been up for a couple of hours, one cup of coffee, quiet time with the Lord and now getting my WAL on.

JAGS
03-23-2015, 01:19 PM
I was just thinking you are up rather early. I have been up for a couple of hours, one cup of coffee, quiet time with the Lord and now getting my WAL on.

Insomnia and early work meetings don't mix. Been up for a while as well. U also have TX time working in your favor.

MedixJK
03-23-2015, 01:23 PM
I was just thinking you are up rather early. I have been up for a couple of hours, one cup of coffee, quiet time with the Lord and now getting my WAL on.

What better way to start the day right?

Canvas JK
03-23-2015, 01:24 PM
What better way to start the day right?

Yes it is.

MedixJK
03-23-2015, 01:25 PM
And to stay on thread, its gonna come down to your choice in tire size....

Canvas JK
03-23-2015, 01:28 PM
And to stay on thread, its gonna come down to your choice in tire size....

This sticky is a wealth of information and will probably answer a lot of your questions. Pay particular attention to the gear charts as they are broken down by motor size and transmission.

http://wayalife.com/showthread.php?2180-JK-FAQ-Answers-to-the-Questions-Every-Newbie-has-about-the-JK-Wrangler&p=21019&viewfull=1#post21019

BillTheCat
03-23-2015, 01:29 PM
Yes the gears can be changed and depending on where you are will determine the cost. What size tires are you going to run.

I'm running 315's now but I'm sure I'll eventually want to go to 37's.

Canvas JK
03-23-2015, 01:33 PM
I'm running 315's now but I'm sure I'll eventually want to go to 37's.

What motor and transmission?

37's will perform better with 5.13 gears, but a little too big for 35's. You MPG will drop when you regear but you will feel a huge performance upgrade. Here is an article Eddie wrote on regearing a 2012+ Rubicons.

http://wayalife.com/content.php?225-Do-Yourself-a-Favor-Regear-Your-2012-Up-JK!!

BillTheCat
03-23-2015, 01:38 PM
What motor and transmission?

37's will perform better with 5.13 gears, but a little too big for 35's. You MPG will drop when you regear but you will feel a huge performance upgrade. Here is an article Eddie wrote on regearing a 2012+ Rubicons.

http://wayalife.com/content.php?225-Do-Yourself-a-Favor-Regear-Your-2012-Up-JK!!

3.6L V6 24V VVT Engine
5-Speed Auto W5A580 Transmission

Great article!

Canvas JK
03-23-2015, 01:43 PM
3.6L V6 24V VVT Engine
5-Speed Auto W5A580 Transmission

Refer to the previous article and sticky. those 2 references will give you a lot of answers.

I would go with the 5.13's since you are in Utah and close to some of the best areas to wheel.

Check around at some off road shops. Off Road Evolution is running a special https://www.offroadevolution.com/specials.html?PHPSESSID=30214dde871988ec430eee65fa 2b208c. Might be worth the drive to Fullerton

BillTheCat
03-23-2015, 01:46 PM
Thank you everyone. Been quite an education.

wayoflife
03-23-2015, 02:36 PM
I'm running 315's now but I'm sure I'll eventually want to go to 37's.

Your 315's will have a true measurement of about 35" or just shy of it. A 37x12.50R17 will have a true measurement of about 35", typically on the money if not just a tad taller. In other words, you're pretty much there already.

BillTheCat
03-23-2015, 03:32 PM
Your 315's will have a true measurement of about 35" or just shy of it. A 37x12.50R17 will have a true measurement of about 35", typically on the money if not just a tad taller. In other words, you're pretty much there already.

So I need to go to 40", right? ;)