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Old 05-15-2017, 07:58 PM
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Jeep Wrangler 35s with stock gearing?

Just looking for any help I can get. I just bought a 2015 Jeep Wrangler Sport Unlimited and was looking to add a 3.5" lift and 35" tires. I see a lot of talk about regearing if I want to go to the 35s, but what are my potential issues if I don't. I assume I have to stock gear ratio of I believe 3.21, but Im not sure. Also, I'd be adding these upgrades for the look only and never really taking it off roading, so any disadvantages there would not matter. Anyone who has this setup, could you let me know what you think about it?!

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Old 05-15-2017, 08:11 PM   #2
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Your Jeep will be a real dog on any kind of hill. I have a rubi so 4.10's and it's barely tolerable. I will rehear when I go to 37's. I'm sure there may be folks who say it's ok but


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Old 05-15-2017, 08:13 PM   #3
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... I also thought I would not really off-road, once you do you get hooked


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Old 05-15-2017, 08:20 PM   #4
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07 3.8L with 4.1 gear, 35" and mine down shifts on every overpass. I can't imagine 35" with 3.21.
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Old 05-15-2017, 08:22 PM   #5
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I have that set up, I've never driven a stock jeep but my grandmas pacifica has the same motor and is way quicker than my jeep


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Old 05-15-2017, 08:24 PM
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Appreciate the honest answers... also, is it detrimental to the vehicle or just an unusual ride compared to stock?
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Old 05-15-2017, 08:26 PM   #7
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To OP: Try it. If you don't like it, then regear. No big deal.
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Old 05-15-2017, 08:34 PM   #8
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I have that set up, I've never driven a stock jeep but my grandmas pacifica has the same motor and is way quicker than my jeep


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It won't hurt anything, but it won't be any fun to drive, either. My JKURX is a slug with 4.10s and 35s, but I'm at 5400ft+, and so down on power compared to a sea level rig.

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Old 05-15-2017, 08:36 PM   #9
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to op: Try it. If you don't like it, then regear. No big deal.
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Old 05-15-2017, 08:47 PM   #10
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Appreciate the honest answers... also, is it detrimental to the vehicle or just an unusual ride compared to stock?


Misread your post. I have 35's and a 3.5" lift, but I have the 3.73 gears and mines a dog. Can't imagine the 3.21s


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Old 05-15-2017, 08:55 PM   #11
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Appreciate the honest answers... also, is it detrimental to the vehicle or just an unusual ride compared to stock?
I was set to tolerate stock gears with larger tires (4.10's and 37's). It wasn't too bad to drive even though I knew it could be better.

What finally pushed me to regear was that I was starting to grow concern for the transmission. I noticed some possible slight temp. increased and occasional odd shifting behavior. (Yes it was programmed)

Albeit I have no real mechanical basis for it, put my transmission just seems much happier since the regear.
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Old 05-15-2017, 11:23 PM   #12
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Running incorrect gearing increases wear and tear on your engine and transmission. If you are doing big tires, do it right and regear.
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Old 05-15-2017, 11:58 PM   #13
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I have a 2.5 inch Teraflex lift, Falcon shocks and 35's Mickey Thompson tires with the stock 3:21 gearing.
Mine is a manual so I get to choose what gear it is in, but I can tell you that 6th gear is useless unless you at going 65+ on the highway.
I live in South FL, so we have no hills, but it would be a bitch in somewhere that did.
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Old 05-16-2017, 12:29 AM   #14
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Is it driveable? Sure.... will you enjoy it? Probably not....
I ran my 35 with 3.21's for about a year. I'm manual though. Finally had enough and did 4.56s .
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Old 05-16-2017, 12:48 AM   #15
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Is it driveable? Sure.... will you enjoy it? Probably not....
I ran my 35 with 3.21's for about a year. I'm manual though. Finally had enough and did 4.56s .
I'm having a REALLY hard time choosing between the 4.56's and the 4.88's.

How's the drivability with the 4.56's and any sort of hills?

I currently have Rubi 32's and 3.73 gears. Anytime I come up on a hill in 6th, I have to downshift. I just can't maintain speed in 6th and it really rubs me the wrong way.
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Old 05-16-2017, 01:24 AM   #16
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Originally Posted by andrew824 View Post
Just looking for any help I can get. I just bought a 2015 Jeep Wrangler Sport Unlimited and was looking to add a 3.5" lift and 35" tires. I see a lot of talk about regearing if I want to go to the 35s, but what are my potential issues if I don't. I assume I have to stock gear ratio of I believe 3.21, but Im not sure. Also, I'd be adding these upgrades for the look only and never really taking it off roading, so any disadvantages there would not matter. Anyone who has this setup, could you let me know what you think about it?!


To see what gears you have enter your VIN# to see your Jeeps build sheet.
https://jeep.custhelp.com/app/jeep/e...WGxOMmc2T2w%3D
The sight looks like it's not working at the moment though for some reason.

Or you can call your local Jeep dealer and ask for the parts guy and give him your VIN# and he can look up and email you a printout of your Jeeps build sheet, even if you didn't buy your Jeep there.
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Old 05-16-2017, 01:49 AM   #17
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I'm having a REALLY hard time choosing between the 4.56's and the 4.88's.

How's the drivability with the 4.56's and any sort of hills?

I currently have Rubi 32's and 3.73 gears. Anytime I come up on a hill in 6th, I have to downshift. I just can't maintain speed in 6th and it really rubs me the wrong way.
I had the same issue but decided to go with 4.88 only because I may end up with 37's. I do know with 4.88 high speed limits will see some pretty good rpms. At 60 mph I am running 2700 rpms in 6th.

Edit: Correction that was 2715 in 6th at 70 mph.
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Old 05-16-2017, 02:02 AM   #18
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Stupid question time about those gear charts. Is the tire size on the chart the measured height or considered the size "on paper" of the tires? I seem to be stuck in a really gray area with my current gearing and tires vs. what I would want to go with in the future. 4.56's on tires that are 33.8" on paper would be overkill right now it looks like, and I might never do 35+, but it seems silly to spend 1500 to go from 3.73 to 4.10's.
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Old 05-16-2017, 02:15 AM   #19
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Stupid question time about those gear charts. Is the tire size on the chart the measured height or considered the size "on paper" of the tires? I seem to be stuck in a really gray area with my current gearing and tires vs. what I would want to go with in the future. 4.56's on tires that are 33.8" on paper would be overkill right now it looks like, and I might never do 35+, but it seems silly to spend 1500 to go from 3.73 to 4.10's.
Those charts are just an estimate. This is a great calculator for gears.

Gear Ratio Calculator
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Old 05-16-2017, 05:46 AM   #20
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I'm having a REALLY hard time choosing between the 4.56's and the 4.88's.

How's the drivability with the 4.56's and any sort of hills?

I currently have Rubi 32's and 3.73 gears. Anytime I come up on a hill in 6th, I have to downshift. I just can't maintain speed in 6th and it really rubs me the wrong way.
I'm very happy I stuck with 4.56s. I almost went 4.88 but shop told me to stick with the 4.56s since I spend 95% of my driving on payment. 6th gear basically feels like 5th and is useable. It still revs a bit high for my liking on highways, but thats just me. 4.88 would have been too much for me. Almost wish I had a 7th gear now lol.
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Old 05-16-2017, 05:48 AM   #21
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I'm very happy I stuck with 4.56s. I almost went 4.88 but shop told me to stick with the 4.56s since I spend 95% of my driving on payment. 6th gear basically feels like 5th and is useable. It still revs a bit high for my liking on highways, but thats just me. 4.88 would have been too much for me. Almost wish I had a 7th gear now lol.
What tires are you running?

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Old 05-16-2017, 05:57 AM   #22
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Stupid question time about those gear charts. Is the tire size on the chart the measured height or considered the size "on paper" of the tires? I seem to be stuck in a really gray area with my current gearing and tires vs. what I would want to go with in the future. 4.56's on tires that are 33.8" on paper would be overkill right now it looks like, and I might never do 35+, but it seems silly to spend 1500 to go from 3.73 to 4.10's.
Gearing is calculated using the tire's weighted rolling diameter. For a 35" tire, that's 33.7" for one that runs close to true, and 33.5 or maybe even a little less for one that runs small. You can calculate the weighted rolling diameter of any tire from the "revs/mile" number for it on tiresize.com. Or just multiply the nominal diameter (e.g. "35") by 0.964 if you just want a quick and dirty number.

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Old 05-16-2017, 05:57 AM   #23
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What tires are you running?

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Old 05-16-2017, 06:21 AM   #24
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Stupid question time about those gear charts. Is the tire size on the chart the measured height or considered the size "on paper" of the tires? I seem to be stuck in a really gray area with my current gearing and tires vs. what I would want to go with in the future. 4.56's on tires that are 33.8" on paper would be overkill right now it looks like, and I might never do 35+,
Very reasonable question. My experience:

Tires: 285/75-17 KM2s on stock Willys wheels, 33.25" actual on-Jeep height.
Gears: 4.56
Trans: 6M

Revs:
70 -- 2600
75 -- 2800
80 -- 3000

I would not want 4.88s with this size tire on the road.

I also use a set of trail tires that measure 36" unmounted and 35.25 on the Jeep at 25psi. 4.56 gears work great with this setup in the dirt/rock. Without the 4:1 t-case they would probably be a little tall, but I'd still rather have that than the 4.88s unless the Jeep rarely saw the interstate.

So I'd say 4.56 with a Rubicon transfer case is a perfect set-up up to 35s (actual height of 33.5-34). After that, I'd be more tempted to go 4.88 but would probably stay with 4.56. Because of the nature of my trail tires, while I do run them on the road to get to the trail, I never go above 65 with them. But they seem fine as far as acceleration. However, they're pretty light for 37s -- wheel/tire combo is 97#.

Quote:
...but it seems silly to spend 1500 to go from 3.73 to 4.10's.
I agree completely. My rule of thumb -- never bother to go up one set of gears in a retrofit. If 4.10 is perfect, 3.73 is close enough to not be worth the trouble. For the same reason I don't think I'd bother to move from 4.10 to 4.56. I'd just stay with 4.10 unless 4.88 was really needed.
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Old 05-16-2017, 07:41 AM   #25
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Stupid question time about those gear charts. Is the tire size on the chart the measured height or considered the size "on paper" of the tires? I seem to be stuck in a really gray area with my current gearing and tires vs. what I would want to go with in the future. 4.56's on tires that are 33.8" on paper would be overkill right now it looks like, and I might never do 35+, but it seems silly to spend 1500 to go from 3.73 to 4.10's.
For a 33/34 I would do 4.56. 4.10 is perfect gearing for a 32 inch tire. 3.73 is too high for a 34.
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Old 05-16-2017, 08:29 AM   #26
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My rule of thumb -- never bother to go up one set of gears in a retrofit. If 4.10 is perfect, 3.73 is close enough to not be worth the trouble. For the same reason I don't think I'd bother to move from 4.10 to 4.56. I'd just stay with 4.10 unless 4.88 was really needed.
4.10 is useless IMO once you move to 35's. It is not close enough with this engine.
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Old 05-16-2017, 08:44 AM   #27
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Just looking for any help I can get. I just bought a 2015 Jeep Wrangler Sport Unlimited and was looking to add a 3.5" lift and 35" tires. I see a lot of talk about regearing if I want to go to the 35s, but what are my potential issues if I don't. I assume I have to stock gear ratio of I believe 3.21, but Im not sure. Also, I'd be adding these upgrades for the look only and never really taking it off roading, so any disadvantages there would not matter. Anyone who has this setup, could you let me know what you think about it?!
Don't waste your money, I run 35x12.5x18 KO2s with the 3.21 gearing and have the 3.5 AEV lift and it doesn't bother me one bit. I off road every now and then, but mostly highway driving. If I lived in the mountains, I would probably consider re-gearing.
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Old 05-16-2017, 08:44 AM   #28
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I have 35s and 3.21s until I can afford a regear. It's fine going straight ~65-70mph, but will downshift if the guy in front of me farts.
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Old 05-16-2017, 09:27 AM   #29
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If you're in the fence between ratios. My experience is that the ONLY draw back to going with lower gears is limited freeway/highway speeds on road trips.

I don't think you can go too low for around town driving or trail runs.
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Old 05-16-2017, 09:27 AM   #30
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I have read a lot about this and was in the same boat. There is a Youtuber called Blacked Out Jeep Wrangler that is running 35s and 3.21 and he says it is fine.

However, after a lot of thought, I am going to have mine regeared to 4.88 when I put on 35s. I would rather spend the money now and enjoy driving the Jeep than thinking about how it feels sluggish. If you can't afford to do both, I would go ahead and get the 35s and live with it a while. If it doesn't bother you, then you will save a lot of money. I thought about going that route, but I know I wouldn't be happy with the performance hit.

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