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Old 04-01-2014, 08:13 PM   #1
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4.56 vs 4.88

I know this is a beat subject but I need some input from people. I'm looking to re gear and was looking at both sets. I have 2013 jku manual tranny with 35's. I was looking for pros and cons to each and what people have think of different brands of gears. Never bought gears before so am kinda lost.

I was also wondering about lockers or limited slips. I don't do to much wheeling yet but I don't wanna pull things apart twice or pay for twice I should say. I was kinda leaning toward limited slip rear with a locker for the front. Then I see electric lockers air lockers. Is it all just preference?

Thanks for all the input guys.

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Old 04-01-2014, 08:23 PM   #2
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I've got the 3.8, so not a direct comparison, but my plan is 4.56, 35's, and an ox locker in the front, either electric or cable. The 4.88 tend to be cheaper, but i just can't help shaking the feeling that it'll be too much for florida highway driving.

If you google jeep jk gear chart 3.6 you should get a chart that will give you rpms at 70mph for given gears and tire size.

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Old 04-01-2014, 09:03 PM   #3
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I'm on 35s debating if I want 4.56 or 4.88
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Old 04-01-2014, 09:09 PM   #4
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Originally Posted by vacca foeda View Post
I've got the 3.8, so not a direct comparison, but my plan is 4.56, 35's, and an ox locker in the front, either electric or cable. The 4.88 tend to be cheaper, but i just can't help shaking the feeling that it'll be too much for florida highway driving.

If you google jeep jk gear chart 3.6 you should get a chart that will give you rpms at 70mph for given gears and tire size.
4.56 roughly 2500 ish
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Old 04-01-2014, 09:11 PM   #5
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I'm on 37s with 4.88 and the 3.6L. Love it. I went from 4.10s. With 35s I feel like 4.10 is easily doable but the 4,56 would probably be better for wheeling. I personally think the 4.88 would be a little low for highway driving though. I'm at 2800-2900 at 75 mph with 37s.

Just my 2 cents
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Old 04-01-2014, 09:20 PM   #6
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Forgot to say that I have a 13 jku 6 speed also
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Old 04-01-2014, 09:25 PM   #7
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i have a 2012 manual with yukon 4.88 gears. i would do it again for sure. it feels perfect in all situations. 2700 rpm's at 70 mph and that feels fine.
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Old 04-01-2014, 11:06 PM   #8
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I'm in the same boat as you, but based on the gear chart, it looks like 4:56's will put me closer to stock RPM's than 4:88's will (I'm running 35's, really 34's under a '13 w/6 speed). It's my DD, so I don't want my RPM's to go too crazy.

Hey, are you gonna change out your differential covers while you're at it?
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Old 04-02-2014, 04:26 AM   #9
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Hey, are you gonna change out your differential covers while you're at it?
If I get the selectable ox air locker it comes with a diff cover. If I don't get that locker than no. I can do that at a later date myself. Trying to save a few bucks.

I was thinking on doing the 4.88 gears because if I do ever wanna go 37's I won't have to re gear again. I would just be happy with what I got.
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Old 04-02-2014, 06:21 AM   #10
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I'm regearing to 4.10s on my 2013 auto. I'm running 33s, and won't be going bigger, and don't do any rock crawling. I am having detroit Truetracs installed front and back at the same time. They look like a great design for a LSD, no clutch plates to wear out.
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Old 04-02-2014, 10:52 AM   #11
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I'm regearing to 4.10s on my 2013 auto. I'm running 33s, and won't be going bigger, and don't do any rock crawling. I am having detroit Truetracs installed front and back at the same time. They look like a great design for a LSD, no clutch plates to wear out.
I think the overall is

33" 4.10
35" 4.56
37" 4.88
38-39 5.13
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Old 04-04-2014, 07:38 PM   #12
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If I get the selectable ox air locker it comes with a diff cover. If I don't get that locker than no. I can do that at a later date myself. Trying to save a few bucks. I was thinking on doing the 4.88 gears because if I do ever wanna go 37's I won't have to re gear again. I would just be happy with what I got.
So you're going with the 4.88? I've decided on going with 4.56....having them installed next Monday.
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Old 04-04-2014, 09:16 PM   #13
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So you're going with the 4.88? I've decided on going with 4.56....having them installed next Monday.
I don't know lol. It's kinda stressing me out. One day im set on 4.88s then the next i change my mind and go back to 4.56. I wanna do 4.88 but then I think it might be to low and too many rpms at highway speed. Oh well too many decisions.

So what brand gears did you go with?
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Old 04-04-2014, 10:00 PM   #14
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I don't know lol. It's kinda stressing me out. One day im set on 4.88s then the next i change my mind and go back to 4.56. I wanna do 4.88 but then I think it might be to low and too many rpms at highway speed. Oh well too many decisions. So what brand gears did you go with?
I know exactly what you mean. I've been going back and forth a lot......I mean, a 4.88 isn't that much lower than a 4.56. And then, am I gonna really be able to feel the difference going from a 4.10 to a 4.56?
Since it's my daily driver, going with 4.56 shouldn't make much of a difference with my mileage compared to the 4.88's. I think that's my main reason for choosing the 4.56. The 4.10 gears aren't that bad, but I just want a little more power at take-off. And I wanna be able to go a little bit slower when I'm off-road in 2-wheel drive.
The gears I'm getting are from G2. A couple of shops I called mentioned G2 as one of the options and a few people in this forum mentioned them. I was told that pretty much all gear manufacturers are good, but it's the person doing the work that's key.
I'll let ya know my outcome after I get it home on Monday.
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Old 04-04-2014, 10:12 PM   #15
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I got 37's on a 2013 auto. 4.88s and they are great as DD and on highway at 70mph runs smooth and can pass again lol.
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Old 04-04-2014, 10:20 PM   #16
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For me, 4.88 would rev too high at 70-80. With 35s, I'd do 4.56. In the summer/fall, I often got to Moab, Telluride, Ouray, Aspen, etc. 4.88s seem like they would rev higher than my 4.10s do with 32s. That would get old fast.
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Old 04-05-2014, 02:28 AM   #17
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Originally Posted by DragnBotm View Post
I don't know lol. It's kinda stressing me out. One day im set on 4.88s then the next i change my mind and go back to 4.56. I wanna do 4.88 but then I think it might be to low and too many rpms at highway speed. Oh well too many decisions.

So what brand gears did you go with?
Yukon 4.56 on Tuesday and Spartan locker up front
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Old 04-05-2014, 01:01 PM   #18
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Originally Posted by Creeperjk View Post
I think the overall is

33" 4.10
35" 4.56
37" 4.88
38-39 5.13
I agree with this. BUT it's really subjective to your needs. I have 4.56s on 35s and I think its perfect. I stressed and stressed about ratio. 4.88s would have been fine for me too- but I could care less about MPG, I drive fast and 85% of my driving is city (or trail). Much ado is made about highway- but how often are you on one? The difference between 2600 and 2800 RPMs at highway speeds is little engine wise- the torque curve here is pretty flat. (For some reason people don't think about the fact that they can test this themselves by downshifting; auto or manual). But it will affect MPG. That said- 4.56s are genuinely a safe bet for 35s especially if you don't need the crawl ratio and you don't want 37s.
(Not much difference between gear brands- they come from the same factory. I have G2s but would have done Yukon, Nitro etc.)
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Old 04-05-2014, 05:32 PM   #19
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This is why the gear chart has 3 color bands indicating the right choice based on bias towards: fuel economy, neutral and performance. You have more flexibility because you have the manual. If you are really unsure go with the middle choice "neutral or balanced" gear ratio and control when you shift; early for fuel economy and at higher RPM for performance. The list provide by Creeperjk is a great choice.
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Old 04-05-2014, 06:10 PM   #20
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4.56 and 35's here its absolutely perfect. Plenty of pep off road and in 6th gear im at 2500 rpm (right at the tip of the green range) at 70mph. 4.88's would be too much in my opinion.
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Old 04-05-2014, 08:15 PM   #21
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4.56 and 35's here its absolutely perfect. Plenty of pep off road and in 6th gear im at 2500 rpm (right at the tip of the green range) at 70mph. 4.88's would be too much in my opinion.
Guess this is what I wanted to hear. Guess 4.56 it is.
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Old 04-05-2014, 08:22 PM   #22
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Quote:
Originally Posted by DragnBotm View Post
I know this is a beat subject but I need some input from people. I'm looking to re gear and was looking at both sets. I have 2013 jku manual tranny with 35's. I was looking for pros and cons to each and what people have think of different brands of gears. Never bought gears before so am kinda lost.

I was also wondering about lockers or limited slips. I don't do to much wheeling yet but I don't wanna pull things apart twice or pay for twice I should say. I was kinda leaning toward limited slip rear with a locker for the front. Then I see electric lockers air lockers. Is it all just preference?

Thanks for all the input guys.
Answer this...

1) Where do you live? If I lived in Colorado for instance, I personally wouldn't even consider 4.56s, but in Florida, I would.
2) What kind of other mods are you planning on getting (particularly bumpers, winch, roof rack, armor, etc.
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Old 04-05-2014, 08:38 PM   #23
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Originally Posted by NFRs2000NYC View Post
Answer this... 1) Where do you live? If I lived in Colorado for instance, I personally wouldn't even consider 4.56s, but in Florida, I would. 2) What kind of other mods are you planning on getting (particularly bumpers, winch, roof rack, armor, etc.
I live right outside of DC. And yes I am considering all of the above. Trying to stay as much aluminum as I can on the bumper and armor.

So with this being said. What's your verdict in the gears.
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Old 04-06-2014, 11:27 AM   #24
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I live right outside of DC. And yes I am considering all of the above. Trying to stay as much aluminum as I can on the bumper and armor.

So with this being said. What's your verdict in the gears.
If you live in DC, and are going to stay as light as possible, I would go with 4.56s, unless you have low speed limits everywhere and almost never go above 65. If that's the case, 4.88s would be the route I'd take. Having the extra power is great. However, 4.56s will still be great.
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Old 04-09-2014, 01:02 AM   #25
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Guess this is what I wanted to hear. Guess 4.56 it is.
Got my jeep back today.. Wrote a little about the 4.56 with 35's
You will really like where the 4.56 puts you with a 35 2700 rpm at 72mph

4.88 for me wouldn't be right because I really spend most of my highway speed between 75-80 which I wouldn't want to be above 3k rpm.
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Old 04-09-2014, 01:09 AM   #26
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Btw mine is automatic
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Old 04-09-2014, 01:12 AM   #27
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Guess this is what I wanted to hear. Guess 4.56 it is.
BUT what if you want to go to 37". I feel like a JKU looks perfect with 3.5" lift and 37" tires. That's what my end goal is. 3.5" lift, 37" tires, 4.88 gears.
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Old 04-09-2014, 03:13 AM   #28
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BUT what if you want to go to 37". I feel like a JKU looks perfect with 3.5" lift and 37" tires. That's what my end goal is. 3.5" lift, 37" tires, 4.88 gears.
It's pretty simple I think it comes down to easy questions
1 what kind of speed do you drive on the highway?
If 65 then 4.88 100 percent if you like running 75-80 4.56's

For me I know in the summer I'll be running from Phoenix to so cal to take kids to Disneyland 75 speed limit on highway 10 I will run 80-83 the whole way.
Going from Phoenix to my northern Arizona ranch I run about 74-77 mph that 100 mile trip.
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Old 04-09-2014, 07:26 AM   #29
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I guarantee that if you did a blind test and had people drive a 4.56 and 4.88 geared Jeep back to back, they would not be able to detect any difference whatsoever.

It's only, what, 150 RPM? That's nothing. Barely even registers on the tach. But, 4.56s are more expensive than 4.88s. At least they were when I did my '11 JKU. So in my opinion if you truly need axle gearing that deep...going to 4.56 is a big mistake.
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Old 04-09-2014, 08:50 AM   #30
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I guarantee that if you did a blind test and had people drive a 4.56 and 4.88 geared Jeep back to back, they would not be able to detect any difference whatsoever. It's only, what, 150 RPM? That's nothing. Barely even registers on the tach. But, 4.56s are more expensive than 4.88s. At least they were when I did my '11 JKU. So in my opinion if you truly need axle gearing that deep...going to 4.56 is a big mistake.
So you installed 4.88 then.

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