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Old 09-12-2014, 07:21 AM
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Gears--4.56 or 4.88--0-45 mph

First time poster--long time reader. I have searched threads and read many about gearing and have seen the charts. The posts I have read are always about highway driving at speeds over 70 or crawling.

I have a 2014 JKU Rubicon with auto transmission, 35" Duratracs and 3.5" AEV lift. I live in Wyoming at 4,900 ft and have wind and hills. I want any opinions on the difference in the power when starting from a stop. What do those that have either gear set think of the 0-45mph range? Most of my driving will be in this range.

Does the auto transmission shift a lot with the 4.88 from a stop to 30 mph?

I had a 2013 with 6 speed manual and 4.56 with same tire/wheel set up but have been without it for a year thanks to a 6:00 am Monday morning drunk driver who t-boned me and rolled me down the street. It ran so much better then stock gears. I cannot remember how often I was shifting from a stop.

Thanks

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Old 09-12-2014, 09:40 AM   #2
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Welcome to the forum wyojeep. I live right next door, in Utah, and I've got two 2014 Wranglers; one is stock, with 32" tires and 3.73 gears, the other has 35" tires and 4.56 gears. The one with 4.56 gears is much better from 0 to 45 mph. It is especially better right of the line, where it reacts instantly, and gets up and goes easily. The one with 3.73 gears and stock tires is noticeably slower, and takes more work to get it going.

The interesting part though, is that the Jeep with 4.56 gears used to have 3.21 gears, and the same 32" tires that the Jeep with 3.73 gears has. Back then, I thought the Jeep with 3.21 gears was a dog, and the Jeep with 3.73 gears was much better. Now the Jeep wtih the 3.73 gears feels like a dog, and the Jeep that has 4.56 gears (and 35" tires) feels much more peppy. Its hard to believe it is even the same Jeep that it was before, because it has been totally transformed.

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Old 09-12-2014, 10:51 AM
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Thanks for the response.

Do you wish you would have gone with the 4.88? or happy with the pep of the 4.56?
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Old 09-12-2014, 11:34 AM   #4
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I have 4.56 gears with the 6 speed and Pentastar to go with my 35" Duratracs.

I find that first gear winds out a little faster than I like and I have to shift into 2nd earlier than I was used to. Then again, the last 6 speed I drove had a Corvette engine with gobs of off-idle torque and a fairly tall first gear that I could wind out pretty far before I had to shift.

You'll certainly see the automatic shift from 1st to 2nd long before you hit 30 when you have 4.88's because you'll top 5,000 RPM in first gear at 30 MPH. But even with 4.56 you'll still probably see a shift before you hit 30 since you'll be around 4750 RPM at 30.

With either gear set you'll probably be shifting into 3rd around 30 unless you're really on the gas hard because you're still around 3,000 RPM +/- in 2nd gear.

But it's an automatic. It does all the shifting for you so does it really matter? It's designed to do all that shifting and will last for probably hundreds of thousands of miles (with proper maintenance).
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Old 09-12-2014, 12:00 PM
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Thanks derf. Leaning toward the 4.88 just making sure it doesn't feel like I'm driving around in 4 low and I have created too much bottom end.

Anyone have a 3.6 auto with 35s running 4.88 gears?
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Old 09-12-2014, 12:01 PM   #6
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Thanks for the response.

Do you wish you would have gone with the 4.88? or happy with the pep of the 4.56?
Yes, and no. I built my Jeep to run 37s. Everything is strong enough for 37s, and I even have enough tire clearance for 37s. But I put 35s on because I have liked the handling and performace of 35s much better than 37s on past Jeeps. This Jeep handles so good though, that I think 37s would be fine. The extra width of the full width axles changes everything. I'm thinking the next tires will be 37s, and for those tires 4.88s would be better. But for 35s I think the 4.56 gears are perfect. I have never wanted lower gears for 35s, at least not around town at the speeds you are asking about. At 80 mph on the highway, when I don't have quite enough power to hold high gear on a gradual uphill, then I have thought 4.88s would be better.
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Old 09-12-2014, 12:09 PM   #7
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Use Derf's calculator above. I also was frustrated because everyone obsesses over highway- I wanted to know about city driving. The calculator was pretty accurate.
I have a 2012 JK, auto, 4.56 gears, 35" MTRs. I really enjoy my 4.56s. But I'd probably do 4.88s if I did it again because I'd like to get the most performance for city and off-roading. Could care less about MPG and IMO the concerns about "high revving" on the highway are somewhat misplaced. I drive between 75 and 80 MPH and don't notice a thing.
4.56s are likely the safest bet but I don't think you can go wrong with either.
(One note: my lovely dealer re-flashed my engine computer when they did the tranny recall. It now has an annoying habit of holding at about 4000 RPMS between 35-40 MPH before upshifting. Seems to be somewhat common with the re-flash. My only concern with 4.88s MIGHT be that this would be worse IF your 2014 currently does this. I imagine this is re-flash related and NOT how your 2014 shifts from the factory.)
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Old 09-12-2014, 02:11 PM   #8
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Thanks derf. Leaning toward the 4.88 just making sure it doesn't feel like I'm driving around in 4 low and I have created too much bottom end.

Anyone have a 3.6 auto with 35s running 4.88 gears?
There are some on the board who have that combo. I'm sure they'll find their way to this thread eventually.

One more thing to consider about the gears and tires. A Wrangler with 4.56 gears and 35" tires will perform very closely to a stock Rubicon with the 32" tires and 4.10 gears. That combination is really nowhere near too much gear for the size of tire. And 4.88 gears is only a 7% change over the 4.56. So no, it won't be anything like driving around in low range. You'd have to get up close to a 10:1 axle gear to feel like you were driving around in low range.
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Old 09-12-2014, 02:17 PM   #9
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go with the 4.88 gear witht the 3.6L engine. where you are in the country, the extra (if you want to call it that) will certainly help you stay in the powerband and almost certainly keep you from any downshift with the automatic on any hills.
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Old 09-12-2014, 02:40 PM
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Thank for the feedback. I am sold on the 4.88s. Just had this vision driving around at 30 mph and transmission stuck at 4000 rpm in 3rd gear and not wanting to shift. I'll post some before and after pics soon.
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Old 09-12-2014, 02:46 PM   #11
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Thank for the feedback. I am sold on the 4.88s. Just had this vision driving around at 30 mph and transmission stuck at 4000 rpm in 3rd gear and not wanting to shift. I'll post some before and after pics soon.
nah you'll be fine. i felt that same way going from 4.88 to 5.38... (older 3.8L engine) turns out that i am very happy with that decision....
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Old 09-12-2014, 04:55 PM   #12
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Thank for the feedback. I am sold on the 4.88s. Just had this vision driving around at 30 mph and transmission stuck at 4000 rpm in 3rd gear and not wanting to shift. I'll post some before and after pics soon.
Just make sure you get something to reprogram the computer. Either a Pro-Cal or a full up tuner. Tell the computer that you switched gears (and tire size) so that it knows what is going on and shifts correctly. Do that and you're golden.
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Old 09-12-2014, 05:26 PM   #13
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Just make sure you get something to reprogram the computer. Either a Pro-Cal or a full up tuner. Tell the computer that you switched gears (and tire size) so that it knows what is going on and shifts correctly. Do that and you're golden.
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Old 09-12-2014, 05:44 PM   #14
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Use Derf's calculator above. I also was frustrated because everyone obsesses over highway- I wanted to know about city driving. The calculator was pretty accurate.
I have a 2012 JK, auto, 4.56 gears, 35" MTRs. I really enjoy my 4.56s. But I'd probably do 4.88s if I did it again because I'd like to get the most performance for city and off-roading. Could care less about MPG and IMO the concerns about "high revving" on the highway are somewhat misplaced. I drive between 75 and 80 MPH and don't notice a thing.
4.56s are likely the safest bet but I don't think you can go wrong with either.
(One note: my lovely dealer re-flashed my engine computer when they did the tranny recall. It now has an annoying habit of holding at about 4000 RPMS between 35-40 MPH before upshifting. Seems to be somewhat common with the re-flash. My only concern with 4.88s MIGHT be that this would be worse IF your 2014 currently does this. I imagine this is re-flash related and NOT how your 2014 shifts from the factory.)

The focus on cruising speed RPM is not an obsession. It is the correct parameter to focus on.

In the end the only that matters is final drive ratio (transmission x T case x diff). Unless you have a pure city or pure off road JK, picking the diff gears based on 0-45 MPH acceleration is a poor choice. The gear charts provide three color bands to choose from based on your preferences.
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Old 09-12-2014, 05:57 PM
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The focus on cruising speed RPM is not an obsession. It is the correct parameter to focus on.

In the end the only that matters is final drive ratio (transmission x T case x diff). Unless you have a pure city or pure off road JK, picking the diff gears based on 0-45 MPH acceleration is a poor choice. The gear charts provide three color bands to choose from based on your preferences.

The color chart for the 4.88 indicates a fair daily driver; who decides what driving conditions the daily driver includes? I live in a small town with no speed limits over 45 mph. My daily driving is from 0-45 mph. Daily drivers in other places may include freeway speeds which is what led to my question.

Thanks for all the feed back.
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Old 09-12-2014, 06:25 PM   #16
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The focus on cruising speed RPM is not an obsession. It is the correct parameter to focus on.

In the end the only that matters is final drive ratio (transmission x T case x diff). Unless you have a pure city or pure off road JK, picking the diff gears based on 0-45 MPH acceleration is a poor choice. The gear charts provide three color bands to choose from based on your preferences.
70 MPH is the only parameter to focus on? Do you just drive your Jeep on the highway? Okay.....
Not sure you read the original thread post- but the OP has seen the gear charts and has information about highway driving. He is asking about 0-45 city driving. I don't think this is his/her sole focus- just what he is asking about in this thread. My JK is city and off-road, which I mentioned, We'll agree to disagree but I think all speeds should be a focus, not just one speed.
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Old 09-12-2014, 06:27 PM   #17
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The color chart for the 4.88 indicates a fair daily driver; who decides what driving conditions the daily driver includes? I live in a small town with no speed limits over 45 mph. My daily driving is from 0-45 mph. Daily drivers in other places may include freeway speeds which is what led to my question.

Thanks for all the feed back.
No speeds over 45 MPH? How do you survive? Do you have traffic lights?
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Old 09-12-2014, 11:13 PM   #18
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Another vote for the 4.88s

I have a JKU, 35" Duratracs, auto, and 4.56 gears. If I would do it again, 4.88s would be my choice.
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Old 09-13-2014, 01:22 AM   #19
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I have a 2012 JKR Auto that came with 3.73 gears. The 35" tires and 4.56 gear combo seems perfect now, but I do plan on running 37" tires someday and at that time I may be annoyed with myself for not getting 4.88 gears.

35" tires are perfect with 4.56 IMHO with the auto.
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Old 09-13-2014, 09:38 AM
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No speeds over 45 MPH? How do you survive? Do you have traffic lights?
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Up to 5 traffic lights!! Don't have to drive very far but the sleep limit on the freeway is 80! Thanks for the advice, have a good weekend.
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Old 09-13-2014, 09:40 AM
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I have a JKU, 35" Duratracs, auto, and 4.56 gears. If I would do it again, 4.88s would be my choice.
I am going with the 4.88s thanks for the reply. This set up should make it more have some more pep then stock.
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Old 09-13-2014, 11:09 AM   #22
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Sorry to threadjack!

MOPWR2U - what tires are these? I'm trying to figure out what size to upgrade to between 33" and 35". Thanks!
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Old 09-13-2014, 11:15 AM   #23
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Trying to decide with a 3.8L, 6spd Manual, 35's, currently have 3.21 but looking to go with either 4.56, 4.88, or 5.13's. Anyone!
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Old 09-13-2014, 08:52 PM   #24
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Sorry to threadjack!

MOPWR2U - what tires are these? I'm trying to figure out what size to upgrade to between 33" and 35". Thanks!
35" Toyo MTs. They're heavy, and stiffer than they need to be for a JK, but they are tough, and they work real good in the mud.
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Old 09-13-2014, 09:07 PM   #25
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Trying to decide with a 3.8L, 6spd Manual, 35's, currently have 3.21 but looking to go with either 4.56, 4.88, or 5.13's. Anyone!
4.88 unless you think you may go to 37s eventually. if you are then 5.13
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Old 09-14-2014, 09:07 AM   #26
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4.88 unless you think you may go to 37s eventually. if you are then 5.13
I was looking at the gear calc on grimmjeeper's site and from what is shows for 33's, 4.10's is all I would need to have better than factory performance. Its a 3.8 manual and came with 245/75/16& 3.21. Currently running 285/76/16. For what it shows on rpms, 4.56 would be overkill for 33's
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Old 09-14-2014, 10:19 AM   #27
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I was looking at the gear calc on grimmjeeper's site and from what is shows for 33's, 4.10's is all I would need to have better than factory performance. Its a 3.8 manual and came with 245/75/16& 3.21. Currently running 285/76/16. For what it shows on rpms, 4.56 would be overkill for 33's
I ran 3.73 & 4.88 with a 3.8L and 35s. 4.88 was about perfect for them. I ran 4.88 with 37s that was okay, 5.13 wouldn't have been bad.

now I run 5.38s with 40s... not too bad at all. did very well in north Georgia.
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Old 12-21-2014, 08:23 AM   #28
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Did you regear with the 4.88s?

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I am going with the 4.88s thanks for the reply. This set up should make it more have some more pep then stock.
If so, how are you liking your jeep now?
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Old 12-24-2014, 12:47 PM   #29
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Thanks derf. Leaning toward the 4.88 just making sure it doesn't feel like I'm driving around in 4 low and I have created too much bottom end.

Anyone have a 3.6 auto with 35s running 4.88 gears?
i do! and i would not change it for anything. i live in central PA and the 4.88's work great. i mostly do town driving but when i am on the highway i think it feels great. even at 70 mph! to me it does not feel like driving in 4 lo. i think it feels right in all driving situations. from wheeling at rausch creek to driving on the highways i love it and if i had it to do all over again i wouldn't change a thing. except, probably getting lockers while they were already doing the gears.
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Old 12-24-2014, 01:30 PM   #30
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Ok I like to ask a question. Why are you guy changing gears on your rig with 33 or 35s I have 33s but had trans programmed to the size tires with the flashpaq from superchips. Got my rpms down and didn't spend alot of money. The trans is programmed for 255/70r18 or the 17's or take it to the dealer to have the trans programed to the tire size we do this all the time at my dealer.

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