5.13 gears with Dana 30
 

Is 4.88 the highest gear ratio available for the Dana 30 or will 5.13 gears work. Running 3.73 auto with 35s on d30 front and d44 rear.
Thanks

5.13 will work on dana 30, check out northridge
http://www.northridge4x4.ca/proddeta...VERHAUL&cat=36

you can run 5.13 and a lot of folks are doing just that :yup:

Any negatives to running 5.13 w/ the d30?

your jk might explode :rotflmao2:

a couple. first off, the higher gear ratio will cause your front drive shaft to spin really really fast and if you're running an aftermarket u-joint style shaft, it will vibrate pretty good if you have too much caster and/or don't have it balanced perfectly. over time, this can cause your t-case to crack. i have seen this happen many times one multiple JK's including mine. the other problem is that on a dana 30, the pinion gets to be really small on a 5.13 and this can potentially be a weak point when wheeling hard.

All stock from my point of view. Teraflex lift (2.5") and Nitto 35s only. will I be asking for trouble?

Doesn't sound too dangerous. 5.13s will help with the power loss and because you already have 3.73s you don't need a new carrier which saves a little bit of cash.

I have been shopping around in the greater metro area for pricing on gear installs, if I come across something reasonable I will be sure and post it up

Thanks let me know.. Actually I'm running stock 4.10s.. apparently the previous owner paid for the upgrade.. so the power loss hasn't been all that bad.. Don't get me wrong, running up to Copper sure is a struggle. any concerns with 4.10s and the setup I listed above and changing to 5.13s?

Sorry I misread that, I have 4.10s as well and I am deeply considering 5.13s. I know after I get those 35s I will really be itching to gain some power back. For now my JK does fine though, Copper is the place to ride. I can hope the 5.13s help with gas mileage and uphill cruising during these CO winters as well. It usually takes me a little over half a tank each way to go riding right now.

i'm running 5.13s with 37's and couldn't be happier
6th gear at 75mph is right around 2800-3000 rpm

I've got 5.13 on my 4 door with 35's and its fine, have had no issues... Wish the gutless motor had a bit more poop though

I have to agree.:thumbsup:

Going to pull the trigger with the 5:13s and ARB lockers this week.

I did exactly that, and could not be happier. Gears were the best mod by far. I went with 5.13s, ARB f/r, and 35s. I have a Dana 30 too BTW.

Just go easy (e.g. don't lock the front, crank the wheel, and floor it).

BTW I had some serious driveshaft balance issues. EVO graciously replaced my driveshaft with a spare take-off and adjusted my caster. Issues solved. :thumbsup: As Eddie said, your DS will be spinning a lot faster (actually about 50 percent) so any caster or balancing issues will be magnified.

Have fun!

-Dawn

Anyone on here have an automatic, 35's and 5.13 gears?!? I was wondering real time RPM on the highway! I don't do much freeway riding and I'm trying to decide between 5.13 or 5.38! I had someone last week give me RPM figures with 5.38 I am looking to see if I can get some figures fr 5.13

this should help you out...

https://www.jk-forum.com/forums/uplo...atio-chart.jpg

Remember to use 'actual' tire height with those charts, and not the MFG's specs. Your tires could easily be 1-1.5 inches shorter than the spec'd height.

The chart that Eddie posted is spot-on. I took a note of my RPMs today while driving at 75ish on the freeway. RPMs came out to about 2700.

I have a JKU with auto, 35s, and 5.13 gears. I was afraid that my RPMs would be too high, but in retrospect I made the right decision. I was considering 4.88 until Wayolifette said to go with 5.13s.

Gears were arguably the best/most favorite mod I have made to date. That being said, Superchips (or equivalent) is crucial with any re-gear or change in tire diameter if you have an automatic transmission. You need to correct your shift points! Even with a manual transmission, it's a good idea to have your mileage and speedo correct.

-Dawn

That what I did and couldn't be happier.

Should I just call the shop that is doing the regear to install the superchip at the same time? How much would that add to cost? Sorry, I am a newbie and do not know anything about a superchip. Thanks for any info.

Superchips is a hand-held tuner. It's portable and plugs into your OBD port. You can buy one from Northridge 4x4 and do the tune/programming yourself. They cost around $350ish. I haven't checked prices in a while.

Anyhow, the Superchips has a lot of neat features, but specific to your situation it will allow you to adjust the Jeep's computer to reflect new gear and tire sizes. If you don't do this adjustment, your speedometer will be incorrect and your shift points (in case of an automatic) will be way off as well.

-Dawn

As Dawn indicated, with new tires and/or gears, the speedo, odo and shift points will be off if you don't recalibrate. (haven't seen anything concrete to back it up, but I believe that there are some legal issues with your odo being inaccurate?) There are a few options available to correct it, just do a little research to see which one is right for you.

The two most popular:
AEV ProCal - cheapest, lots of great functions, but no tuning
Superchips Flashpaq - more expensive, lots of great functions, has several tuning options

Some others to check out:
Hypertech -
Diablo -
Dealership - used to only be able to program up to 32". There have been a few posts indicating that this may have changed and they can do 35's? Might be an option if they do it for free. Definitely look into your own programmer if they charge...

What about running 4.88? Will I have to balance all those do-hickeys and worry about blowing up offroad?!

any time you change gears or tire size, you need to recalibrate your speedometer. in other words, yes, you will need at the very least an aev procal but, a superchips or hypertech will do more for you.

Any tire height or gear ratio change will affect the computer/speedo/odo/shift points/mpg's/etc. Correct it. Or don't... :dontknow2:

Superchips it is then. Gonna buy it this week. Thanks for info.

I have 5.13s, and auto, and 35s. I could not be happier. When I did the upgrade from the factory 4.10s it was a noticable differance with a whole new driving feel. Not to mention the less stress on the drivetrain as whole. Got the gears from Northridge and they are great, the shop that installed them said they set up easy and were good quality. Im @ 20K miles with no problems.

I run about 2300 RPM on the interstate @ 70mph. If I drive like a grandma I get about 16.7-17 mpgs hwy, on the 91 superchip tune.

I was getting about 15mpg hwy with the 4.10s and no superchips.

I have also had no other driveline problems and wheel frequently, but I am light on the gas and take notice not to run the front axle too hard. I plan on keeping it open for now.

Here is a link that I have found very informative about the whole new gears thing....

https://www.jk-forum.com/forums/show...?82262-Gearing

good luck !

see of this helps

GET 5.13!!! I just got them put on today... couldnt be happier!!! in city driving is much improved! havent had a chance to test high way too much yet... Definately worth the price! Get them with Dave at Northridge!!:thumbsup::beer: