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Old 12-23-2015, 09:31 AM
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3.6L Auto 35" Gear Ratios

Good morning everyone,

First post here and looking forward to joining the community. Just added a 3" lift and 35s to my 2013 3.6L auto with what I believe has a stock 3.21 ratio. Power isn't as bad as I thought it would be, but definitely saving up for a gear swap. It's a DD for me in Florida on flat roads, but did a fair bit of wheeling with it stock and now looking to do more.

Reviewing the 3.6L Pentastar gear charts, what are folks thoughts on 4.1 versus 4.56? I'm assuming there will be no issues with these in the Dana 30 front and Dana 44 rear?

Thanks in advance,

Scott

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Old 12-23-2015, 09:46 AM   #2
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If you are mainly on flat grounds, you would probably benefit with better gas mileage on 4.10s. If you drove in hills or mountains more, then I would suggest 4.56s. Really either would be fine.

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Old 12-23-2015, 09:56 AM   #3
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Wouldn't hurt to just do the 4.56. Small rpm difference at 70.
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Old 12-23-2015, 10:01 AM   #4
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I went with 4.88 in my 2 door with 35s and have no regrets...........4.56 would probably be what you need......if you think you may ever go bigger than 35s I would do 4.88
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Old 12-23-2015, 10:07 AM
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Thanks for the quick feedback, leaning towards the suggested 4.56. Now to figure out which brand.
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Old 12-23-2015, 10:24 AM   #6
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Thanks for the quick feedback, leaning towards the suggested 4.56. Now to figure out which brand.
I have a 2.5" lift and 35" tires (3.6L auto). I went from 3.21's to 4.56 and don't regret it in the least. As I was shopping around, I found that the 4.56's are a bit easier to come by than 4.10's. I went with Yukon gears.

Keep in mind that you'll have to change your front carrier to accept 3.73 or higher (others will correct me if I'm wrong). I was told at a reputable local shop that I'd need that as well.

The change is noticeably better.
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Old 12-23-2015, 11:59 AM
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I have a 2.5" lift and 35" tires (3.6L auto). I went from 3.21's to 4.56 and don't regret it in the least. As I was shopping around, I found that the 4.56's are a bit easier to come by than 4.10's. I went with Yukon gears.

Keep in mind that you'll have to change your front carrier to accept 3.73 or higher (others will correct me if I'm wrong). I was told at a reputable local shop that I'd need that as well.

The change is noticeably better.
Thanks 5cary, if you don't mind me asking how much shop time did it cost you or did you do it yourself? I was quoted 10 hours which seems a bit excessive, was figuring more around 5 hours for a shop that does it on a regular basis.
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Old 12-23-2015, 05:15 PM   #8
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My local guy charges $250 labor per axle.
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Old 12-23-2015, 05:48 PM   #9
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Where in FL are you located, Mebourne?
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Old 12-24-2015, 10:04 AM   #10
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Thanks 5cary, if you don't mind me asking how much shop time did it cost you or did you do it yourself? I was quoted 10 hours which seems a bit excessive, was figuring more around 5 hours for a shop that does it on a regular basis.
I don't recall the hours. The total job was $1600 parts and labor. I had it done at a shop in MD.
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Old 12-24-2015, 10:52 AM
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Where in FL are you located, Mebourne?
Hey Meucci, in the Orlando area now, but grew up in the Melbourne area.
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Old 12-24-2015, 10:53 AM
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My local guy charges $250 labor per axle.
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I don't recall the hours. The total job was $1600 parts and labor. I had it done at a shop in MD.
Jus / 5cary, thanks for the info. Those price are more in line with what I was expecting. I'll look around and check out some more places.

Thanks for the help.
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Old 12-24-2015, 10:57 AM   #13
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Thanks for the quick feedback, leaning towards the suggested 4.56. Now to figure out which brand.
Most differential gears are produced at the same manufacturing facility. I'm partial to Revolution, but so long as you stick with the major manufacturers, and take the best deal from any of them, you're pretty much getting the same gears.

Quote:
Originally Posted by 5cary View Post
I have a 2.5" lift and 35" tires (3.6L auto). I went from 3.21's to 4.56 and don't regret it in the least. As I was shopping around, I found that the 4.56's are a bit easier to come by than 4.10's. I went with Yukon gears.

Keep in mind that you'll have to change your front carrier to accept 3.73 or higher (others will correct me if I'm wrong). I was told at a reputable local shop that I'd need that as well.

The change is noticeably better.
Correct for the front axle.
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Old 12-24-2015, 01:23 PM   #14
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My vote is for 4.56s

We went with 4.56 Yukon gears on our 2014 JKURX with 35s. The tires were BFGoodrich KM2s so the actual tire size was closer to 34s. Performance should be even better with a tire closer to a true 35". No regrets and the Jeep was my wife's daily driver. The RPMs were right around 3000 (just outside the green on the tach) when traveling 80mph on the Interstate but the engine/tranny had plenty of power and no mechanical issues (nearly 45,000mi in two years of ownership and we bought it new). We're actually in the process of building our new 2016 JKUHR the same way.

(The 2014 JKURX sacrificed herself to protect my wife and son in a head-on collision at 60 mph caused by another individual. May she forever rest in peace. ...and yes everyone is OK.)
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Old 12-24-2015, 01:28 PM   #15
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Keep in mind that you'll have to change your front carrier to accept 3.73 or higher (others will correct me if I'm wrong).
That's a very good excuse to upgrade and get a good limited slip front carrier (or selectable locker).
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Old 12-24-2015, 02:20 PM   #16
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Hey Meucci, in the Orlando area now, but grew up in the Melbourne area.
Eau Gallie High grad here, class of '79
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Old 12-24-2015, 02:31 PM   #17
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That's a very good excuse to upgrade and get a good limited slip front carrier (or selectable locker).
I wish I knew that when I had the work done...but I was pretty well tapped out on funds anyway.
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Old 12-24-2015, 06:12 PM
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That's a very good excuse to upgrade and get a good limited slip front carrier (or selectable locker).
Thanks for the idea Sportcoupe! Surprisingly a quick search doesn't so many for a 30 Dana JK, 4 wheel parts has a DL TrueTrac. Know of any specific places to go looking?
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Old 12-24-2015, 06:14 PM
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Eau Gallie High grad here, class of '79
Awesome! Melbourne High '86 myself.
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Old 12-24-2015, 06:46 PM   #20
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Thanks for the idea Sportcoupe! Surprisingly a quick search doesn't so many for a 30 Dana JK, 4 wheel parts has a DL TrueTrac. Know of any specific places to go looking?
This thread probably isn't the best place to start this topic as it can get rather heated on running a limited slip or locker in a front D30 axle.

I had a TrueTrac in my TJ's dana 30 and it was fine for my off-roading. The rock climbers complain it is an open diff once a wheel is in the air.
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Old 12-27-2015, 09:09 PM   #21
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not many rocks in Florida. unless you are up at Hardrock in Ocala. check out Jeepers Den in east Orlando on 50, see what they say.
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Old 12-27-2015, 09:31 PM   #22
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I am in a D30 front situation. For my needs I'm about to upgrade to ARB air lockers (with the onboard compressor) and 4:56 gears. Running 3:73 now and I really hate my highway performance.

I am doing it for two reasons.

1) Reduce the gear hunting my transmission does @ 70+
2) Be able to lock the differentials for my very limited off road escapades.

It is for those two reasons only. I don't care about hardcore crawling. *shrugs*

Isn't cheap by no means.
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Old 12-28-2015, 08:49 AM   #23
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For the amount of money you spend regearing I bought a rubicon front axle and had 4.10 gears installed in the rear for a few hundred more than just the regear.
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Old 12-30-2015, 10:45 AM   #24
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For the amount of money you spend regearing I bought a rubicon front axle and had 4.10 gears installed in the rear for a few hundred more than just the regear.
I started thinking about this. So I started pricing them. Still going to be pretty expensive as I want ARB Air Lockers and 4.56 gears. However the Dana 44 front axle makes more sense in the long run.
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Old 12-30-2015, 05:03 PM   #25
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OP. Manual. 34"s mounted. G2 4.56. DTT 30+44. Perfect. IIRC, the auto is a bit "lower" geared than the manual. If you have absolutely no intention of ever going 37"s.. 4.88, IMO, would be too much. 4.56 FTW. If a tire is in the air, the BLD will assist the LSD. I'll get everywhere a locked rig will, they'll get there -at times- more efficiently.

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