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Old 01-08-2020, 08:53 AM
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any regrets going 4:56 on 285/75/17?

Does anyone have any regrets going 4:56 on 285/75 with a manual trans?

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Old 01-08-2020, 09:08 AM
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I am asking because the shop I am considering said a previous customer of theirs thought it was too low, claiming first gear was almost useless.

Isn’t a stock rubi w/4:10 similar to the combo I’m considering?

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Old 01-08-2020, 09:16 AM   #3
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Does anyone have any regrets going 4:56 on 285/75 with a manual trans?
I think you'll like it. I'm 4.56 on 315's and an auto, so a direct comparison is off a little, but not much. I had the 4.56's with 295's which are smaller than your 285/75's and it was fine.

And yes that combo is very close to a 4.10 Rubi on stock tires.
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Old 01-08-2020, 09:19 AM   #4
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No regrets at all.

Like it very much actually.
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Old 01-08-2020, 09:23 AM   #5
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I’m auto, 295/70/17’s with 4.56 and love it. Great around town, off road, and on highway.
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Old 01-08-2020, 09:51 AM
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@Pressurized thank you for confirming this combo is similar to a stock Rubicon.

Your knowledge is always greatly appreciated.
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Old 01-08-2020, 09:56 AM   #7
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I think you will like that combo. I'm in a different boat with auto transmission but when I went 35's I was up in the air between 4.56 and 4.88. Ended up going 4.88 and glad I did. Felt strange running those RPMs at highway speed vs the stock 3.73s at first but these engines are built to operate in that range and the difference in responsiveness throughout the gears was night and day difference. Now that I'm on 37's I'll be going 5.13 when I do differential upgrades. So, I think that gear ratio will be a good choice for that tire size.

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Old 01-08-2020, 09:56 AM   #8
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@Pressurized thank you for confirming this combo is similar to a stock Rubicon.

Your knowledge is always greatly appreciated.
Yeah, it's a 100 RPM difference on paper.

Cheers!
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Old 01-08-2020, 09:57 AM   #9
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Right now I’m running the stock 4.10 gears with manual trans and 35x12.5 tires on my JKUR.

I’m actually surprised how fine it is. Really no noticeable drop off in drivability or power around town. That said, I haven’t been on the highway with 6th gear yet. All flat land here too, hilly areas or at elevation would make a difference
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Old 01-08-2020, 11:01 AM   #10
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Right now I’m running the stock 4.10 gears with manual trans and 35x12.5 tires on my JKUR.

I’m actually surprised how fine it is. Really no noticeable drop off in drivability or power around town. That said, I haven’t been on the highway with 6th gear yet.
You will only use 6th on the highway above 65/70. A few months back I went from 4.10s to 4.88s on my 10A and I'm beyond happy. It is back to how it felt with the 32s, maybe a touch lower; sometimes I can pull out in second. Crawling is fantastic too.

I agree you can 'live' with 4.10s & 35s, but 4.88s really let you live if you know what I mean!
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Old 01-08-2020, 11:28 AM   #11
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I'm going to be running 34's and will go to either 4.10 or 4.56? I tow a trailer on occasion so perhaps I'm better off with the lower gear ratio. I do know that the 3.21 is pure torture even with the stock tires. I live in very hilly country and spend more time in 4th then any other gear! I love my JKU but the stock gearing is atrocious imo....
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Old 01-08-2020, 11:49 AM   #12
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Good to know all this. I had 315/70 for a couple years on my factory 3.73's, and had 285/75 installed last Memorial weekend. Never had had any issues, but we took my in-laws over to Jersey to drive past my old house and see my old stomping grounds, and crossed back over the Delaware on the back country roads where it gets quite hilly in PA. For once, the Jeep struggled a bit with four adults in it. Made me start to wonder if 4.56's were in my future after all, but Michigan is still too flat for that upgrade I think. But it's on the list if I ever need to get my gears out for any reason (along with doing e-lockers).
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Old 01-08-2020, 12:32 PM   #13
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I'm going to be running 34's and will go to either 4.10 or 4.56? I tow a trailer on occasion so perhaps I'm better off with the lower gear ratio. I do know that the 3.21 is pure torture even with the stock tires. I live in very hilly country and spend more time in 4th then any other gear! I love my JKU but the stock gearing is atrocious imo....
I would personally recommend 4.56. Especially pulling a trailer. That was part of my decision when I decided on 4.88 over 4.56 with 35's and was really pleased with that combo.
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Old 01-08-2020, 01:19 PM   #14
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I would personally recommend 4.56. Especially pulling a trailer. That was part of my decision when I decided on 4.88 over 4.56 with 35's and was really pleased with that combo.
At the end of the day I'll most likely go with 4.56. Worst thing is some reduced mileage but better driveability imo. The change will have to wait until spring which means not installing my new 34's and Rubicon wheels and 2.5 lift. Can't imagine making a bad situation worse as I really hate the 3.21 gears.
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Old 01-08-2020, 01:48 PM   #15
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At the end of the day I'll most likely go with 4.56. Worst thing is some reduced mileage but better driveability imo. The change will have to wait until spring which means not installing my new 34's and Rubicon wheels and 2.5 lift. Can't imagine making a bad situation worse as I really hate the 3.21 gears.
If you’re paying to install gears, I’d absolutely do 4.56 minimum. I wouldn’t spend money to put 4.10 in
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Old 01-08-2020, 01:54 PM   #16
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If you’re paying to install gears, I’d absolutely do 4.56 minimum. I wouldn’t spend money to put 4.10 in
Sounds like the consensus is 4.56 so that's what I'll do this spring. BTW I'm paying to have them installed as I don't have the mechanical knowledge nor patience to do it myself. Do a lot of my own mechanical wrenching but have zero experience with doing gears. Just not something I want to try and OJT to perform.
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Old 01-08-2020, 03:25 PM   #17
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At the end of the day I'll most likely go with 4.56. Worst thing is some reduced mileage but better driveability imo. The change will have to wait until spring which means not installing my new 34's and Rubicon wheels and 2.5 lift. Can't imagine making a bad situation worse as I really hate the 3.21 gears.
4.56 will be a good choice. As far as gas mileage goes, main drop will be at highway speeds on flat terrain due to the RPM difference. But the improved performance throughout the gear range is well worth it. To my personal liking, right now I feel slightly undergeared running 4.88 with 37's so when I do differential upgrades later this year I will definitely move to 5.13.

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Old 01-08-2020, 03:41 PM   #18
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I just put 285/75s on my JKR with a manual T and 4.10. I did notice a performance hit going to the new tires from the OEM 32s, but not objectionably so. I have no desire, wants, or needs to change to a 4.56 and incur those costs. However...if you're coming from 3.21s or 3.53, then yes. If you do a lot of high altitude wheeling I can see 4.56.

But, for me, there wasn't enough difference to justify the change.
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Old 01-08-2020, 06:12 PM   #19
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I'm going to be running 34's and will go to either 4.10 or 4.56? I tow a trailer on occasion so perhaps I'm better off with the lower gear ratio. I do know that the 3.21 is pure torture even with the stock tires. I live in very hilly country and spend more time in 4th then any other gear! I love my JKU but the stock gearing is atrocious imo....
I test drove a wrangler with the 3.21's and auto in the mountains and I cannot believe that was the standard configuration that the dealer stocked.
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Old 01-08-2020, 06:36 PM   #20
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I test drove a wrangler with the 3.21's and auto in the mountains and I cannot believe that was the standard configuration that the dealer stocked.
I suppose it's used to improve fuel economy but good grief for my taste it's just terrible. I feel it's so hard on the clutch with stock tires and with larger tires it would do a number on it after not to many miles imo. At least with the manual trans I can hold it much longer in lower gears but it's not right for that jeep imo.

I'll be very happy when I can get it changed out to 4.56.
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Old 01-08-2020, 06:45 PM   #21
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I suppose it's used to improve fuel economy but good grief for my taste it's just terrible. I feel it's so hard on the clutch with stock tires and with larger tires it would do a number on it after not to many miles imo. At least with the manual trans I can hold it much longer in lower gears but it's not right for that jeep imo.

I'll be very happy when I can get it changed out to 4.56.
When we test drive vehicles I always go first and then advise my wife on whether she would enjoy driving it next. When we drove the JKU with 3.21's we went about a mile down the road and I only finished the test drive because the salesman had us on a loop. It was absolutely a terrible configuration and to only offer that in the mountains was crazy.
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Old 01-08-2020, 07:23 PM   #22
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Does anyone have any regrets going 4:56 on 285/75 with a manual trans?
I have 4.56 with 285/75R17 on a manual Willys JK and love it. Crawling is much better and 5th gear isn't a "second overdrive" any more.

1st gear seemed pretty useless stock on the street except from a dead stop - if you want good 0-60 you should not be getting a Wrangler
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Old 01-09-2020, 10:56 PM   #23
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You will only use 6th on the highway above 65/70. A few months back I went from 4.10s to 4.88s on my 10A and I'm beyond happy. It is back to how it felt with the 32s, maybe a touch lower; sometimes I can pull out in second. Crawling is fantastic too.

I agree you can 'live' with 4.10s & 35s, but 4.88s really let you live if you know what I mean!
I hear ya. I wouldn’t be surprised if I end up with 4.56 on my rig in the future. I can definitely see how they would help in low speed situations off road instead of slipping the clutch with 4.10’s
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Old 01-10-2020, 05:25 AM   #24
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I hear ya. I wouldn’t be surprised if I end up with 4.56 on my rig in the future. I can definitely see how they would help in low speed situations off road instead of slipping the clutch with 4.10’s
If you do get serious about re-gearing, look into the difference between 4.56 and 4.10. There is not much difference, and if you are spending the $$ to upgrade, I believe 4.88 makes more sense and really does get you back to stock perf with a 6spd. imho
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Old 01-10-2020, 08:42 AM   #25
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I haven't found a definitive answer for my question on the Forum. I'll try on this thread.

What needs to be replaced other than gears to upgrade to a higher gear?

Maybe I'm not asking it right.

Thanks for any information.
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Old 01-10-2020, 11:22 AM   #26
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I haven't found a definitive answer for my question on the Forum. I'll try on this thread.

What needs to be replaced other than gears to upgrade to a higher gear?

Maybe I'm not asking it right.

Thanks for any information.
Master install kits, and depending on what your factory gears were you may need a new carrier.
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Old 01-10-2020, 11:35 AM   #27
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I haven't found a definitive answer for my question on the Forum. I'll try on this thread.

What needs to be replaced other than gears to upgrade to a higher gear?

Maybe I'm not asking it right.

Thanks for any information.
That will depend on what you are running now. Rubicon or non Rubicon, etc. Stock D30 with 3.21 will require carrier upgrade, etc. Otherwise, typically it's ring and pinion and install kit. Finding a good reputable off road shop will tell you exactly what you need and review any other options that you might opt for.

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Old 01-10-2020, 11:41 AM   #28
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I haven't found a definitive answer for my question on the Forum. I'll try on this thread.

What needs to be replaced other than gears to upgrade to a higher gear?

Getting my 30/44 re-geared from 3.21 to 4.56 this weekend.
Here is everything I am giving the shop:
Front and rear gear set (Yukon)
Front and rear master rebuild kit (Timken)
* Front and rear LSD carriers (Eaton TrueTrac)
* Front and rear diff covers (PS)
* Front and rear cover gaskets (LubeLocker)
4 quarts 85W90 gear oil (Valvoline regular)


All * items are optional with the notable exception of a required front carrier due to an increase ring gear size in the D30. If you go from D30 3.21 (and I think 3.73) you need to replace the front carrier. I chose to get an LSD installed, front and rear, at the same time. If you don't have them, but want lockers (electronic, air, mechanical, etc.) this is the time to add them.


Some additional info, I went from 255/70R18 to 285/75R17 with auto. MPG went from 17.5 to 15.3 with just tires (and rims), over last 4 tankfuls. I believe the re-gear will actually improve MPG.
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Old 01-10-2020, 11:49 AM   #29
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Getting my 30/44 re-geared from 3.21 to 4.56 this weekend.
Here is everything I am giving the shop:
Front and rear gear set (Yukon)
Front and rear master rebuild kit (Timken)
* Front and rear LSD carriers (Eaton TrueTrac)
* Front and rear diff covers (PS)
* Front and rear cover gaskets (LubeLocker)
4 quarts 85W90 gear oil (Valvoline regular)


All * items are optional with the notable exception of a required front carrier due to an increase ring gear size in the D30. If you go from D30 3.21 (and I think 3.73) you need to replace the front carrier. I chose to get an LSD installed, front and rear, at the same time. If you don't have them, but want lockers (electronic, air, mechanical, etc.) this is the time to add them.


Some additional info, I went from 255/70R18 to 285/75R17 with auto. MPG went from 17.5 to 15.3 with just tires, over last 4 tankfuls. I believe the re-gear will actually improve MPG.
I get 16 to 18 MPG around town on 285/75R17 with 4.56 on a manual.
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Old 01-10-2020, 06:07 PM   #30
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Originally Posted by SprkEng View Post
I haven't found a definitive answer for my question on the Forum. I'll try on this thread.

What needs to be replaced other than gears to upgrade to a higher gear?

Getting my 30/44 re-geared from 3.21 to 4.56 this weekend.
Here is everything I am giving the shop:
Front and rear gear set (Yukon)
Front and rear master rebuild kit (Timken)
* Front and rear LSD carriers (Eaton TrueTrac)
* Front and rear diff covers (PS)
* Front and rear cover gaskets (LubeLocker)
4 quarts 85W90 gear oil (Valvoline regular)


All * items are optional with the notable exception of a required front carrier due to an increase ring gear size in the D30. If you go from D30 3.21 (and I think 3.73) you need to replace the front carrier. I chose to get an LSD installed, front and rear, at the same time. If you don't have them, but want lockers (electronic, air, mechanical, etc.) this is the time to add them.


Some additional info, I went from 255/70R18 to 285/75R17 with auto. MPG went from 17.5 to 15.3 with just tires (and rims), over last 4 tankfuls. I believe the re-gear will actually improve MPG.
Thanks for the list. Others on this thread have opted or have stated that you might as go up to a 4.88 instead of the 4.56. What made you decide to go with the 4.56?

Thanks all for your feedback.

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