4.56 or 4.10
 

I'm looking to upgrade my gears 13 wrangler 3.73 currently running 35 with winch and bumpers. What would be better 410 or 456. This is a daily driver a lot of highway and mud and rock crawling

In the case where you may someday turn it into just a toy. Go 456, nobody iv heard of that went that way for 35s has complained

I dont always drive where others cant. but when I do, its in my Jeep. Stay muddy my friends

Between the two, definately 4:56. Anything less wouldn't be all that noticable, not to mention the expense for just a slight change.

I have a 2013 JKR auto with stock 4.10's. It does ok but would be better with 4.56. I not going to change mine, I just recaled for tire size. I believe that a standard tranny would need 4.56 but not sure whats best for them.

4.10s would be a waste of money...im doin 4.56 next month at the advice of the shop. They also stated 4.10s cost more anyways. Not sure how accurate that last statement is...

If I beat you to it, Ill let you know how it goes.

Goin into the shop Monday for 4:56's
I have a 6spd 2013 JK with 3:73 and 32's right now.
Monday it gets a 2.5" RK lift, 35's , and 4:56's
It's my double duty DD and toy. Would go 4:88's if it was just a toy.

I'm trying to figure this out cause I can get a set of almost new 4.10 take offs for 100

I have 4.10s in my DD 2012 JKU Auto and 35s. It drives great around town and on the hightway. That being said when i haul my M416 trailer i wish i had 4.56s.

I would go 4.56 do it once, do i right and call it a day.

If you don't have a rubi you will have to purchase different axle shafts to fit the gears if I'm correct. Spline count will be different

The ring gear and pinion has nothing to do with the axle spline count, that depends entirely on the carrier/locker. If he doesn't have a Rubi he'll need the take offs out of one of the early JK X or Saharas that came with 4.10s from the factory or an aftermarket set

Had 4.56's in my 12 jku. Perfect gear setup for my needs. I crawled in big bear, and daily drove up and down the 5, 405, 73 ect.. when I lived in orange county.

I have a rubicon

Interesting thread as I am in a similar position. Have a 2013 JKU auto w/ 3.73. I put 315/70r17 tires on. I would like just alittle more on the highway. According to the charts, 4.10 gets me back to 3.73 performance. Some say put alittle extra gear in to compensate for the additional weight of bumpers, gears and aerodynamic drag (lift). I run lift, front & rear bumpers, steps, spare tire.

I have read that if you put the jeep in 4th gear (auto) on 2012+ years, that would be the equivelant of 4.56 gears, if you really have 3.73. This would give you an idea of RPM at 70 mph.

The easy way to think about it is that you need more horsepower to move a heavier rig with larger tires. Getting back to stock rpm on a larger tire and heavier rig, doesn't cut it. You need to be higher up in the RPM range where more horsepower is made.

Paying to go to 4.10 on a 2012+ makes no sense if you run 34"-35" tires. Also, it is a misconception that higher rpm means lower mpg. The goal is maximizing efficiency. At 4.56, the average use case will downshift less, thereby increasing fuel economy.

I went from 3.73 on a light 2013 2 door, to 4.88. On my 35s it actually was pretty nice, but 4.56 would have been ideal if I did a lot of highway. I went to 37s, which is why 4.88 made sense.

The new engines run great in the mid 2000's.

What about 4.10 six speed with 37's

I would do 4.56 or 4.88.........................

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Definitely 4.88... If I were going to choose between 4.10 and 4.56 it would be 4.56 but I love the 35/4.88 combo in mine and I daily drive. Just don't under gear.

You won't use your higher gears...

I have 07 with 4.10 32" tires

I was going back and forth reading everything I could trying to decide on 4.10 or 4.56 for my '12 with 35's. I do a lot of highway driving and didn't want to rev too high. I went with 4.56 and think its perfect. The shop agreed that the cost to go to 4.10 wasn't worth it. I think you'd be very happy with 4.56 around town and on the highway.

Am in the same boat, but it costs around $800 in labor and oil to do the job, while there's a shop near Montreal that will do 4.56 for around a Grand out the door. And they specialize in Jeeps.

I have a '12 JKU Sport/auto and went from 3.21 gears to 4.56 gears with 35s. I live in the mountains and wheel it pretty often. Its fun to drive around town again and it spins right at 3000RPMs on the highway at 80mph. It doesnt hunt for gears anymore on the highway and its much more pleasant to drive. The rigs can handle the RPMs so just go for it. Hell, the rubicons come stock with 32s and 4.10s.

Just went from 4.10s to 4.88s in my '12, night and day difference! I'm running 35s and with the possibility of 37s for the next set of meats so 4.56s didn't make sense. I have a 6m and it turns just under 3k at 80 on the highway, or anywhere else you want to do 80 lol. I have never seen better than 16.5 on the vic and that was all highway driving, usually 14.5 around town. I saw 17.5 running around town and it did go slightly down once I hit the highway and rand about a 100 mile stretch, 16.9. I am still breaking them in, its not a daily driver but would not have geared it differently, 4.56s, if it was. Its so nice to hit an uphill stretch on the highway and not end up in 4th gear in the slow lane anymore!! Speedo has always been calibrated with the Procal.

Well i just went to 37s and im running stock 4.10 rubi gears and its fine. Plus bigger the gear smaller the pinion which means easier to break

Been driving on the 4:56's now for a few days. With 35's and 6spd man, it's perfect for a double duty jeep. Makes a good DD except the shift from 1-2nd comes pretty quick.
I'm getting about the same mpg as my 3:73 and 32's. Shift into 6th at about 60 mph.
Happy Happy Happy!

Thought I would follow up with thread. I did the gear swap on my 2013 JKU. I went from 3.73 to 4.56. I have the automatic transmission. I have Kelly TSR 315/70r17 tires. I corrected the ECM with Flashcal. The speedometer was correct before the gear swap, been verified against my GPS and a radar. I just finished the other day. My initial impression is great around town, but a bit over geared for the highway. My RPMs; prior about 2200; currently 2750; all at 70 mph. Picked up some MPG around town but lost some on the highway. My JK is first and foremost a daily driver. Just being honest with myself about its use.

I am going to drive it a bit more, and see how I feel about it and look at the MPG numbers some more. I kind of feel at this point, wishing I had just gone 4.10, like some of the effective gear ratio calculator had suggested.

I'm on my phone not sure where your located but if you don't like the 4:56, I would be willing to trade my 4:10's. Just swap both axles and be done.

Haha... Was thinking the same thing 😁


Sent while my wife wasn't looking...

Yeah. The Auto is a different animal. With 6 spd and 315 Duratracs (33.75"), I'm turning 2500 at 70.

Im regearing my rig as well. Im in the same boat as a lot of you so, this is good info. My 2012 Jk has 3:21 w/6spd manual tranny. One question that might be answered here. Anyone have 4:56's with 33" tires? I ask because I literally just bought new 33" MTZ's two weeks ago. I was so disappointed with the 33" Pro Comp A/T Xtremes I had since it was new, that I had to get rid of them. I know, should've considered 35" but I didn't.

You will be fine with stock gears and 33s

X2 no need to go to 4.56 if that's as big a tire as you go. I'm running 4.10 with 37's on my Rubicon (with the 4.0 transfer case of course). I will regear down the road but thats because I want to crawl slower like it did with 32s. I had 3.21's on my sport with 32s and did great in 4 lo. With the 3.6 you can get away with going a few sizes bigger because of the extra rpm and torque.

Im running the exact same as you haha, I was worried when I switched but its still decent, definitely not worth the extra cake right now to me.

I'm not sure how I feel about this. I had 4.88’s in my 08 running 35’s and it was too low. Mostly because i as running km2’s at 33.5"
I don't think the 3.8 was as happy at 3k as the 3.6 is. I'm thinking about gearing toward the lower end again since the 3.6 does seem to be a little more at home in the higher rpm's. Not sure if it's got a higher rpm efficiency than the 3.8 or not.

I'm having 4.56s installed right now. I've got a '13 2 door manual that I DD. Its a sport that had 3.21s, I added Rubi take off wheels and tires which I really like a lot. I'm regearing for power but I'm mainly into expedition stuff so I intend to stay with my 32s at least until they wear out and perhaps pick up another set since they are so cheap ($800 for 5 wheel/tire). I think most here are concerned about under gearing where I am more concerned with over gearing. I hope I didn't go to low for my use with 32s. One thing I have considered is buying a used set of 35s on cheap rims and running them only when I wheel. I don't mind swapping out tires and can do it pretty quick. Adding an eaton e-locker in the rear as well. I'm pretty excited to get it back tomorrow night.

Why ARE the 4.10's more expensive? Is there a valid reason? :dontknow2:

4.56 are a bit low for 32 but if your going to 35's then it makes sense

I can only assume supply and demand. I think that 4.56s were fairly expensive as well before 2012 but as more people are gearing less with the 3.6 the demand has gone up so more shops are making them. It makes sense in my mind at least.

I was thinking about this again last night and I'm going to have to play around a bit with tire size. If I could have found rubicon take off axles I would have absolutely gone that route and know I would have been happy with 4.10s but it seems like all the ones I found were super expensive or totally trashed or just empty shells. I'm into my re-gear $1,900 ($580 for gears + minor rebuild kits, $850 eaton e-locker, $90 front open carrier, $400 installation) I could have been only $300 on labor if I wanted to pull the axles but decided it was worth my time and the headache to leave them on. The closest I got with take offs was about $4,500 but that would have given me a front locker as well. My buddy just spend $1,800 on wheels and tires. I don't want to spend that much on rubber.

Oh nice. Let me know how that thing runs down the highway! its going to be great off road. IM curious about your rpm's at 70-75.