4.10 or 4.56 Gears - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 24 Old 11-29-2013, 12:20 PM Thread Starter
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4.10 or 4.56 Gears

I have a Nex Gen Dana 30 in front and Nex Gen Dana 44 in rear, both have 3.21 gears and 33" tires. Looking to upgrade to a new set of gears before Jeep Safari in April.

Questions:
1. Will I need a whole new diff carrier to install the new gears or will they fit on a 3.21 diff carrier?

2. I may plan to get 34" or 35" tires in the future, what set of gears would work best for said tires?

3. My jeep is a 6-spd standard, 6th gear is useless right now. How will adding 4.10 or 4.56 gears affect that?
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post #2 of 24 Old 11-29-2013, 12:31 PM
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Yes you will need a new carrier or add a locker.
For a 34" tire in Utah with the 3.8 and 6 speed 4.56 would get you around the mountains better then the 4.10.

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post #3 of 24 Old 11-29-2013, 01:25 PM
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Only by trial will you know. That said I just went from 32 and 4.10 gears to 35's. The gearing is fine but I haven't been off road yet. I liked the torque of the 32 and 4.10 combination on and off road.

I'd really like to try the 4.56 in mine, but it's just not economical to try and re-try if it doesn't work.

I vote 4.56.

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post #4 of 24 Old 11-29-2013, 01:28 PM
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Its awesome when someone with a different motor and transmission chimes in on their gearing experiences and adds absolutely nothing but confusion to the thread.

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post #5 of 24 Old 11-29-2013, 02:04 PM
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Quote:
Originally Posted by thedirtman View Post
Its awesome when someone with a different motor and transmission chimes in on their gearing experiences and adds absolutely nothing but confusion to the thread.
Now I'm afraid to say anything (joking)!!

I'm guessing you have the 3.8???? I have a 2007 with 4:10's in mine and 35's, it was okay until you hit a hill or headwind and towing my tent trailer it was useless. It was fine with 33's so that makes a big difference just in tire size. I'd say 4:56's also.

I'm not trying to be a slimeball but I have front and rear carriers I just pulled out with the stock 4:10's for the rear, sorry front got burned up, I'll give you a good deal as I hopefully don't need them. You could just do the rear that way and see if you like it then do the front after you decide. Just remove the front driveshaft until they match. Got pictures if you want.

Oh yea, one more thing. I couldn't find aftermarket 4:10's, everyone said it was dealer only and they wanted $950 for just the front ring and pinion in Canada.

Sean
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post #6 of 24 Old 11-29-2013, 03:52 PM Thread Starter
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Quote:
Originally Posted by thedirtman View Post
Yes you will need a new carrier or add a locker.
For a 34" tire in Utah with the 3.8 and 6 speed 4.56 would get you around the mountains better then the 4.10.
Thanks for the info. I was thinking 4.10, but G2 doesn't make a 4.10 for a Dana 30 JK. I'm thinkin I'm gonna do the 4.56, since G2 makes it for the d30 and it's not as expensive as an Alloy.
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post #7 of 24 Old 11-29-2013, 03:54 PM Thread Starter
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Quote:
Originally Posted by Sgo70 View Post
Now I'm afraid to say anything (joking)!!

I'm guessing you have the 3.8???? I have a 2007 with 4:10's in mine and 35's, it was okay until you hit a hill or headwind and towing my tent trailer it was useless. It was fine with 33's so that makes a big difference just in tire size. I'd say 4:56's also.

I'm not trying to be a slimeball but I have front and rear carriers I just pulled out with the stock 4:10's for the rear, sorry front got burned up, I'll give you a good deal as I hopefully don't need them. You could just do the rear that way and see if you like it then do the front after you decide. Just remove the front driveshaft until they match. Got pictures if you want.

Oh yea, one more thing. I couldn't find aftermarket 4:10's, everyone said it was dealer only and they wanted $950 for just the front ring and pinion in Canada.

Sean
Yes sir, I do have the 3.8L. First Jeep I've ever dealt with, so all this is foreign to me, but I thank you for your input. Probably gonna do the 4.56 gears from G2 since they make them for a d30.
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post #8 of 24 Old 11-29-2013, 05:29 PM
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I replaced a set of G2's with Yukons and thought it was funny that they were identical right down to the numbers stamped on the pinion. The factory ones were slightly different making me wonder if G2 and Yukon were made in the same place. Hope ya enjoy them,

Sean
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post #9 of 24 Old 11-29-2013, 05:43 PM
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Quote:
Originally Posted by Sgo70 View Post
I replaced a set of G2's with Yukons and thought it was funny that they were identical right down to the numbers stamped on the pinion. The factory ones were slightly different making me wonder if G2 and Yukon were made in the same place. Hope ya enjoy them,

Sean
I understand that 100% of JK gears, except for Standard 4.88s, are all make in the same plant in Korea.

So yes. The Yukons and the G2s were made in the same factory.


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post #10 of 24 Old 11-29-2013, 08:19 PM Thread Starter
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Quote:
Originally Posted by Sgo70 View Post
I replaced a set of G2's with Yukons and thought it was funny that they were identical right down to the numbers stamped on the pinion. The factory ones were slightly different making me wonder if G2 and Yukon were made in the same place. Hope ya enjoy them,

Sean
It's probably like with any aftermarket part or fluid. They are all made in the same place, then a company stamps their name on it. We are basically just paying for the brand name!


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post #11 of 24 Old 11-29-2013, 08:51 PM
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I'm interested in changing to larger tires too... How can I find out what gears I have on my JK? Its a 2007 2 door Rubicon with a 6 speed manual transmission. Do I have to call the dealer? Thanks for any help!
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post #12 of 24 Old 11-29-2013, 08:52 PM
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If you're going to do 34's or 35's in Utah with a 3.8, I wouldn't do anything less than 4.88 gears, if not 5.13's. You will need a new carrier for the front. You won't need a new carrier for the rear. However, the best time to install lockers is when you do gears so it's worth saving up so you can do both at the same time.


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post #13 of 24 Old 11-29-2013, 09:16 PM
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Quote:
Originally Posted by Bart View Post
I'm interested in changing to larger tires too... How can I find out what gears I have on my JK? Its a 2007 2 door Rubicon with a 6 speed manual transmission. Do I have to call the dealer? Thanks for any help!
As far as I know, all 3.8 rubicons came with 4.10's.

Or you can call the dealer with your VIN. Or go to the For Owners area on the jeep website and look for the 'contact us' email, then fill in your info including the VIN. Or put the rear end on stands, spin a tire, and count driveshaft revolutions.
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post #14 of 24 Old 11-29-2013, 09:20 PM
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Quote:
Originally Posted by thedirtman View Post
Yes you will need a new carrier or add a locker.
If you have been considering adding traction devices, this is definitely the right time. It'll be an extra $300 or so to put a truetrac up front rather than a new open carrier.
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post #15 of 24 Old 11-29-2013, 09:31 PM Thread Starter
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Quote:
Originally Posted by Bart View Post
I'm interested in changing to larger tires too... How can I find out what gears I have on my JK? Its a 2007 2 door Rubicon with a 6 speed manual transmission. Do I have to call the dealer? Thanks for any help!
You need to request a "build sheet" from Jeep. Go to the www.chrysler.com, go to the "contact us" tab, enter in all your information and then in the "comments" section ask for a build sheet for your year, model and VIN. The build sheet will give you all the information of the parts that were on that vehicle when it left the dealer.


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post #16 of 24 Old 11-29-2013, 09:36 PM
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Reapercrew...
THANK YOU! I will be doing that tonight...
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post #17 of 24 Old 11-30-2013, 02:13 PM
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I contacted Chrysler last night and they immediately sent me the build sheet for my Rubicon. It does have 4:10 gears... thanks GreenJk, you were right. Now I have to decide if its worth it to go with 315/70/17 (34 inch) tires and change the gearing or something smaller and keep the stock gears. (Where I live in CA there are a lot of rolling hills) It alway boils down to money... Thanks again for the help.
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post #18 of 24 Old 11-30-2013, 02:50 PM Thread Starter
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Quote:
Originally Posted by Bart View Post
I contacted Chrysler last night and they immediately sent me the build sheet for my Rubicon. It does have 4:10 gears... thanks GreenJk, you were right. Now I have to decide if its worth it to go with 315/70/17 (34 inch) tires and change the gearing or something smaller and keep the stock gears. (Where I live in CA there are a lot of rolling hills) It alway boils down to money... Thanks again for the help.
That's great! If i were you I'd seriously sit down and figure out how much time your rig sees those rolling hills. My rig is a daily driver, and I'm stuck with 3.21 gear. I plan on upgrading to 4.56 just so I have the peace of mind when I do hit the mountain trails.


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post #19 of 24 Old 11-30-2013, 08:54 PM
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I have a 2009. 3.8 6 speed. 321 stock gears. Went to 456 and 35 tires. Live in Florida. If I lived anywhere with hills I would definitely do the 488 or 513. My set up is fine for me, just take into consideration the type of driving you will be doing and the terrain. Just saying.
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post #20 of 24 Old 11-30-2013, 11:02 PM Thread Starter
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I have a 2009. 3.8 6 speed. 321 stock gears. Went to 456 and 35 tires. Live in Florida. If I lived anywhere with hills I would definitely do the 488 or 513. My set up is fine for me, just take into consideration the type of driving you will be doing and the terrain. Just saying.
It's a daily driver, doesn't see the mountains very often. Maybe in the summer time, that's about it. Thanks for the input. Bytheway, what kinda bumper you runnin?


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post #21 of 24 Old 12-02-2013, 09:37 AM
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Personally I would do 4.88 or 5.13 (I did 5.13 on my ’08 w/ 35’s, auto trans) with the 3.8L. If you have a manual 4.88 would be good for an auto 5.13. 4.56 for the 3.8L are only good up to 33” tires. With 4.88 or 5.13 you will be set up for 35’s and 37’s.

4.10’s, well as you can see you can’t find aftermarket 4.10 and even if you could it would be wasted on the 3.8L.

-Dan

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post #22 of 24 Old 12-02-2013, 12:30 PM Thread Starter
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Personally I would do 4.88 or 5.13 (I did 5.13 on my 08 w/ 35s, auto trans) with the 3.8L. If you have a manual 4.88 would be good for an auto 5.13. 4.56 for the 3.8L are only good up to 33 tires. With 4.88 or 5.13 you will be set up for 35s and 37s.

4.10s, well as you can see you cant find aftermarket 4.10 and even if you could it would be wasted on the 3.8L.

-Dan
What will 4.88's do with 33's? This is mainly a daily driver, so how much can I expect to lose in fuel economy?


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post #23 of 24 Old 12-02-2013, 12:41 PM
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I went from 4,10 to 5.38s (with 33s) and my mileage in the city went up about 1 to 2 mpg. Highway is down 1/2 mpg or less.

Don't fear the gear.


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post #24 of 24 Old 12-02-2013, 01:57 PM Thread Starter
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I went from 4,10 to 5.38s (with 33s) and my mileage in the city went up about 1 to 2 mpg. Highway is down 1/2 mpg or less.

Don't fear the gear.


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That ain't bad at all! It could stand to go up in the city anyways!!


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