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Old 03-12-2008, 11:56 AM   #1
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4.10 or 4.56

So, looking at upgrade and looking to regear.

Should I go 4.10 or 4.56 for a daily driver on 33" tires.

And if I go 4.56 in my D30 front will in need a new carrier..I have 3.73 gears now.

Thanks guys and gals for the input.

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Old 03-12-2008, 11:59 AM   #2
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I'd go 4:56's it will run like it did when it was all stock. The carrier in the front will not have to be changed if you have 3:73's now.

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Old 03-12-2008, 12:53 PM   #3
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Assuming you're not running the 3-speed automatic, 4.56 will be ideal for your 33" tires. 4.10 will "work" too but that ratio is not as good of an all-around ratio for 33" tires as 4.56 is. 4.56 restores the power lost by installing bigger tires far more effectively than 4.10 does.
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Old 03-12-2008, 12:59 PM   #4
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This is interesting for me to learn and it is along the same lines of what I have been researching this week. I have 33's and a 3.07 ratio and I was told if I wanted to go to a 4.10/ 4.11, that I would have to replace the differential. I was told basically that the new gears would not fit in the one that I have. I have a d35 and want to swap my 3.07 to something bigger, like a 4.11, or based on this conversation, maybe a 4.56. Anyone know what all I would have to buy to make the swap?
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Old 03-12-2008, 01:03 PM   #5
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Jerry -
I am running an automatic. Would that make a difference? Also I am looking for your expertise to know if I would have to swap out my D30 carrier or not. Opinions>

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Assuming you're not running the 3-speed automatic, 4.56 will be ideal for your 33" tires. 4.10 will "work" too but that ratio is not as good of an all-around ratio for 33" tires as 4.56 is. 4.56 restores the power lost by installing bigger tires far more effectively than 4.10 does.
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Old 03-12-2008, 01:04 PM   #6
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This is interesting for me to learn and it is along the same lines of what I have been researching this week. I have 33's and a 3.07 ratio and I was told if I wanted to go to a 4.10/ 4.11, that I would have to replace the differential. I was told basically that the new gears would not fit in the one that I have. I have a d35 and want to swap my 3.07 to something bigger, like a 4.11, or based on this conversation, maybe a 4.56. Anyone know what all I would have to buy to make the swap?
i believe the 4.10/4.56 will fit in a 3.73 carrier but not a 3.07
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Old 03-12-2008, 01:06 PM   #7
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Quote:
Originally Posted by branty View Post
This is interesting for me to learn and it is along the same lines of what I have been researching this week. I have 33's and a 3.07 ratio and I was told if I wanted to go to a 4.10/ 4.11, that I would have to replace the differential. I was told basically that the new gears would not fit in the one that I have. I have a d35 and want to swap my 3.07 to something bigger, like a 4.11, or based on this conversation, maybe a 4.56. Anyone know what all I would have to buy to make the swap?
The carrier for the 3:07 would have to be changed to accommodate lower gears. If you have a ratio of 3:55 and up your carrier will need to be replaced. With gear ratios the smaller the number the higher the gears are. The larger the number the lower the gears are.
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Old 03-12-2008, 01:14 PM   #8
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What do you guys think is a fair parts & labor price for 456's ?
Other than the better acceleration, how do you think the gears will effect the daily fuel economy ?
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Old 03-12-2008, 01:43 PM   #9
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Quote:
Originally Posted by branty View Post
This is interesting for me to learn and it is along the same lines of what I have been researching this week. I have 33's and a 3.07 ratio and I was told if I wanted to go to a 4.10/ 4.11, that I would have to replace the differential. I was told basically that the new gears would not fit in the one that I have. I have a d35 and want to swap my 3.07 to something bigger, like a 4.11, or based on this conversation, maybe a 4.56. Anyone know what all I would have to buy to make the swap?
You don't need to replace the entire differential, only the carrier (aka gear case) inside the differential which is only $60 or so to buy. Two different size carriers are used depending on the gear ratio to be installed.
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Old 03-12-2008, 01:47 PM   #10
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What do you guys think is a fair parts & labor price for 456's ?
Other than the better acceleration, how do you think the gears will effect the daily fuel economy ?
$1100-1200 is a fair price for everything to regear both axles. I paid just over $1200 my first time and just under $1100 the last time when I pushed a little harder. Economy-wise, there's not enough difference between 4.10 and 4.56 to worry about. On and off-road, the 4.56 ratio will be better with 33" tires than 4.10 would be.
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Old 03-12-2008, 01:51 PM   #11
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Jerry -
I am running an automatic. Would that make a difference? Also I am looking for your expertise to know if I would have to swap out my D30 carrier or not. Opinions>
Details man, details. Do you have the 4-speed or 3-speed automatic, or at least what model year TJ do you have and what size engine? What ratio do you have now?
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Old 03-12-2008, 03:42 PM   #12
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i have a 4-speed automatic, 33" tires, and i went with 4.88 gears. fuel economy is better than the stock 3.73 gears, and i love the power i have.
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Old 03-12-2008, 03:46 PM   #13
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Sorry Jerry,

I have an 03 Sport with a 4.0L 6 cylinder engine. And currenlty I have 3.73 gears. I think it is a 4-speed...what ever comes from the factory.

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Details man, details. Do you have the 4-speed or 3-speed automatic, or at least what model year TJ do you have and what size engine? What ratio do you have now?
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Old 03-12-2008, 04:01 PM   #14
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i have a 4-speed automatic, 33" tires, and i went with 4.88 gears. fuel economy is better than the stock 3.73 gears, and i love the power i have.
I can imagine how much better your jeep performs around town, hows is it on the Hwy ? If I'm going to do this....your saying 4.88's over the 4.56's ?
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Old 03-12-2008, 05:22 PM   #15
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Sorry Jerry,

I have an 03 Sport with a 4.0L 6 cylinder engine. And currenlty I have 3.73 gears. I think it is a 4-speed...what ever comes from the factory.
Your 4-speed automatic has a very deep final overdrive gear ratio so whatever you do, do not go with too high of a ratio as the engine will be bogging all the time and you'll be having to keep shutting the overdrive off via the switch.

For 33" tires, 4.56 is the usual recommendation except for the 4-speed auto where a slightly lower ratio is better, lower as in 4.88. That's what I would go with if I had your 4-speed automatic (and I wish I did!).
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Old 03-12-2008, 05:27 PM   #16
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Your 4-speed automatic has a very deep final overdrive gear ratio so whatever you do, do not go with too high of a ratio as the engine will be bogging all the time and you'll be having to keep shutting the overdrive off via the switch.

For 33" tires, 4.56 is the usual recommendation except for the 4-speed auto where a slightly lower ratio is better, lower as in 4.88. That's what I would go with if I had your 4-speed automatic (and I wish I did!).
Well boys 4.88's it is. I had the 4.56's installed in my 4x4 2500 Ram, so I I DONT FEAR THE GEAR !
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Old 03-12-2008, 05:27 PM   #17
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i have 4.56 gears with 35s and my jeep has the 4spd auto tranny.
for me it works fine and i have a good gas mileage.
at 65 mph highway speed i have 2000 rpm in 4th gear with OD on.
thatīs enough to hold the speed and to accellerate moderate without shifting.

but i live in a region without hills and mountains. in the mountains 4.88 or higher would be better.
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Old 03-12-2008, 07:41 PM   #18
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you need both carriers in both d30 and d35. i would personaly go with 4.88. im in pretty close to the same situation you are in with the 3.07s. and thats what im going with
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Old 03-12-2008, 08:32 PM   #19
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i have a 3 speed auto, with 33'' 3.07 gears. at highway speeds (65mph) i run at 2700rpm (i think is pretty high) i was planning to run 35'' i figured 4.10 was a big jump from my 3.07 so it would be the same...what do you guys think??
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Old 03-12-2008, 08:46 PM   #20
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2700 RPMs are way too high for 3.07 and 33" tires at 65 mph, are you certain you don't have 3.73 instead? My calculator says it should be closer to 2000-2040 with 3.07 gearing, a 3-speed automatic, and 33" tires. Actually, 2700 RPMs at 65 sounds too high for even 3.73. When is the last time you calibrated or at least checked your speedometer for accuracy?
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Old 03-12-2008, 08:48 PM   #21
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So are we all saying that now we are up to 4.88 gears? For every day driving and driving 2-6 hours to trails at hwy speeds...65-70mph?

That just sounds really high! But this is why I ask.
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Old 03-12-2008, 08:49 PM   #22
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2700 RPMs sounds too high for 3.07 and 33" tires at 65 mph, are you certain you don't have 3.73 instead?

I agree. is that 65 with the speedo corrected or not?
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Old 03-12-2008, 09:07 PM   #23
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i'd go 4.56
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Old 03-13-2008, 06:11 PM   #24
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i get about 14mpg with the 4.88 and it is a daily driver. i went with the 4.88 because i live in pa and there is alot of hills.
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Old 03-13-2008, 09:07 PM   #25
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ok so i have a 6 speed manual with 3.07 gears and a d30. im running 33's what would be i ideal gearing for me a buddy told me 4.88's??? i dont know anything about this stuff so could you let me know everything that i would need to do. thanks
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Old 03-13-2008, 09:18 PM   #26
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i have 35s with a 4spd auto tranny (0.69 in 4th gear) with 4.56 gears. at 65 mph i have 2000 rpm in 4th gear. it works fine for me and i have a good mileage.

the 6spd manual tranny has 0.84 in 6th gear. that means that with the manual tranny i would have about 20% more RPM at the same speed.

with the powerful i6 and manual tranny i wouldnīt install 4.88 gears.in the small D30 only 2-3 teeth have contact in the diff. thatīs not enough IMO. iīve seen damaged 4.88s R&Ps in D30s with manual tranny.
with an auto trnny this wouldnīt be a problem. the torque converter compensates the torque peaks that you have with a manual.

i would go with 4.56 gears if i were you.
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Old 03-13-2008, 09:41 PM   #27
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i have a 3 speed auto, with 33'' 3.07 gears. at highway speeds (65mph) i run at 2700rpm (i think is pretty high) i was planning to run 35'' i figured 4.10 was a big jump from my 3.07 so it would be the same...what do you guys think??
i have 3.07 gears 32in tires and a 3spd trans im only turning 2300 at 65mph. did you ever recalibrate your speedo after the 33in tires were put on. your rpms and mph dont match up
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Old 03-13-2008, 11:58 PM   #28
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ok well im planning o getting d44's so i wont worry about just the gears
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Old 03-14-2008, 12:23 AM   #29
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To the OP, 4:56s has been very good with an automatic tranny but what you might want to think about is if you are going to add lockers down the road. That way you're only tearing the axles apart once and saving same cash.
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Old 03-14-2008, 06:25 AM   #30
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General question: I'm considering installing some new gears in my heep myself to save some cash. Can this job be handled by an "accomplished" mechanic. I've done a few motors and every other component .... except the trans ans axles.

What do you guys think?

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