Gear ratio for 35s - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 25 Old 03-04-2012, 02:16 PM Thread Starter
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Gear ratio for 35s

Im lookin at purchasing 35" mt/r tires.. i will be purchasing a 2.5 lift along with the tires.. my question is will the stock 6 spd gears be able to handle the tire size? I read in another thread discount said that the tires should be available mid to late march.

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post #2 of 25 Old 03-04-2012, 02:42 PM
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Your profile says you have a Sport, but doesn't indicate what gears you have. Sports come standard with 3.21s, but have an option for 3.73s. The 3.73s on a 6-spd should be fine. You'll probably lose 6th gear around town, but it'll still be useful on the highway. With 3.21s you'll be struggling a little and lose 6th gear completely. You'll probably be wanting to re-gear sooner.

On the trails, if you crawl, you'll want to re-gear with either.

Get the 35s and you can always re-gear later.

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post #3 of 25 Old 03-04-2012, 02:42 PM
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Good luck finding 35" Kevlars... assuming that's the MT/R you're talking about.


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post #4 of 25 Old 03-05-2012, 08:29 AM
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If you decide to regear, go with 5:13's so you dont have to regear again when you go to 37's.
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post #5 of 25 Old 03-05-2012, 08:46 AM
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5.13 is perfect!!!

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post #6 of 25 Old 03-05-2012, 08:56 AM
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Quote:
Originally Posted by STUPIDFACE View Post
If you decide to regear, go with 5:13's so you dont have to regear again when you go to 37's.
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Originally Posted by JKUnlimitedSport_2010 View Post
5.13 is perfect!!!
^^This
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post #7 of 25 Old 03-05-2012, 09:01 AM
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4.56 would make a nice highway/road gear, 4.88 would be ideal in my opinion, help the crawl some off-road...but if there is ANY chance you want to go 37s or bigger, definitely consider 5.13s

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post #8 of 25 Old 03-05-2012, 05:55 PM
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35s with 2.5 inch RK running 3.73 starting tomorrow (stock) 5.13s on the way
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post #9 of 25 Old 03-11-2012, 10:17 PM
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I remember looking to regear my TJ that I had to get new carriers also?! Are these needed on the JKs also? I'd assume a D30 is a D30 right (looking for a stronger axle actually)... and of course the 44 in the rear? I can't even find carriers to swap gears.
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post #10 of 25 Old 03-15-2012, 10:40 AM
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What year is your Jeep? The 3.8 V6 will require 4.10's as the tallest gearset that'll be happy with the 6-speed. If you have a 2012 with the 3.6 V6, then I can't speak with any personal experience.


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post #11 of 25 Old 03-20-2012, 08:09 PM
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513, 6 speed on 35's. no regrets. runs at about 2800ish rpm doing 65.

also, i would recomment gussets and sleeves. i have them. HUGE improvement over stock
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post #12 of 25 Old 03-21-2012, 04:51 AM
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Quote:
Originally Posted by qkslvr View Post
35s with 2.5 inch RK running 3.73 starting tomorrow (stock) 5.13s on the way
Hey- how is this setup running for you? Is it unbearable on the highway at speeds of 60 or 70.
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post #13 of 25 Old 04-04-2012, 01:49 PM
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Quote:
Originally Posted by qkslvr View Post
35s with 2.5 inch RK running 3.73 starting tomorrow (stock) 5.13s on the way

Quote:
Originally Posted by chrisd0729 View Post
Hey- how is this setup running for you? Is it unbearable on the highway at speeds of 60 or 70.
Bump on this, I would love to kow also! This is the same exact set up I'm looking at (minus the 5.13s for now)

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And everything else is stock. For now.

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post #14 of 25 Old 04-04-2012, 01:57 PM
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I am running 35" MTR/Ks with 4.10 gears (Rubi 6 speed) and a 3.5" lift for a year and had 35" Cooper MTs on it prior to that with 4.10s. It's doable but would be better regeared. If you have an automatic like my previous JK with 35s and 4.10s (Rubi), it's a DOG on hills unless you disengage the electronic O/D!!! At least with a stick you can downshift to 5th and keep on cruising.

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post #15 of 25 Old 08-23-2012, 10:29 AM
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I've got 35s running a 3.5" lift with 3.73s right now. Most of my time is spent on the road since it is my DD, but I'm a weekend wheeler. I want to go up and was looking at 4.56, but I seem to be reading that 4.88s are ideal? I wanted to know how this affects highway driving? Anybody else have this issue? Also, I only have the 4-speed auto, so I think that changes things.

Also, would it be easier to re-gear, or just swap out for a new axle(s) with the specified gear ratio?
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post #16 of 25 Old 09-08-2012, 01:50 PM
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Attachment 55707 someone se t this to me hope it helps

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post #17 of 25 Old 11-23-2012, 01:59 PM
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Running 35" BFG MT's on OEM wheels with 1.5" spacers on an '08 4 door Rubi with full soft top/half doors an the auto trans.

It wasn't an interstate hill champ with the stock tires, but with a downshift out of OD, it was fine. This V-6 loves to rev, so it has no problems doing so wth the 35's.

The 35's are only on the JK when we go wheeling.Otherwise it wears a set of the 17" Goodyear all-seasons. So changing gears is not an option for us.

Overall, yeah, they slow it down a little, but not a significant amount. I think 4.88's would be too much gear for 35's.

Sorry if this post wanders. I had a few customers come in while trying to post it.

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post #18 of 25 Old 05-08-2014, 10:20 AM
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I just put in 4.56

2014 amp'd sport
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post #19 of 25 Old 02-27-2018, 10:19 AM
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I recently changed to 4.88's from stock 3.21's on my 3.6 manual with 35's. I was debating between 4.56 & 4.88 and decided to go to 4.88 because I tow a lot. The tires measure actual 34". I am happy I went 4.88. 2700 rpm at 70 is fine. It seemed a little high at first, but I am used to it now. I can drive 80 no problem, which I don't do very often. The power really makes a difference though. I never have to downshift going up hills on the highway anymore and I can pretty much roll around town at any speed in 4th.
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post #20 of 25 Old 12-01-2019, 09:44 PM
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Great insight on gear ratios in this thread. MY 2011 JK standard 6 speed transmission with 3:21 gears ratio and I have (265[30"] 70 17) AT tires on right now and just added a 2.5 inch lift.

From what I gather if I wanted to go up to a 35" tire I should regear to at least 4.10.

MY 30" tires run about 2000 rpm at 70 mph, a 35" tire as the chart reads that my rpm would drop to 1800 rpm or maybe lower?

I don't do much highway driving so it may be okay? but would gas mileage go down?

I'm around 16 mpg avg. right now.

So as I hear a 33" from a tire store, may be the tallest I should go with to keep mpg the same and rpm's the same and not have to regear? Although I see here in the Forum 35" to 37" are the go to tire size.

Hopefully I can get some feedback from longtime members here or merchants.

Thank you in advance.

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post #21 of 25 Old 12-02-2019, 08:30 PM
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Quote:
Originally Posted by sprkeng View Post
Great insight on gear ratios in this thread. MY 2011 JK standard 6 speed transmission with 3:21 gears ratio and I have (265[30"] 70 17) AT tires on right now and just added a 2.5 inch lift.

From what I gather if I wanted to go up to a 35" tire I should regear to at least 4.10.

MY 30" tires run about 2000 rpm at 70 mph, a 35" tire as the chart reads that my rpm would drop to 1800 rpm or maybe lower?

I don't do much highway driving so it may be okay? but would gas mileage go down?

I'm around 16 mpg avg. right now.

So as I hear a 33" from a tire store, may be the tallest I should go with to keep mpg the same and rpm's the same and not have to regear? Although I see here in the Forum 35" to 37" are the go to tire size.

Hopefully I can get some feedback from longtime members here or merchants.

Thank you in advance.

Regarding fuel economy changes:
33s will cost you fuel economy - not as much as 35s or 37s, but there's no magic threshold.
Any increase in tire diameter and/or weight will likely reduce fuel economy.
You may already see ~0.5 MPG reduction from your lift (increased wind resistance).
Performance gains will cost you at the pump.
- I think that's in the Bible (First Octanes; 87-91 or something ).


Regarding tire sizes:
What limitations have you encountered with your current tire size?
What offroading do you do now - snow, mud, sand, rocks, potholes in mall parking lot?
What do you wish to gain by changing tire size?

I'd throw 35s on that 2.5" lift and regear to 4.88 - but you might hate that setup.
My Jeep on 37s with 4.88s is great for my wheeling needs, but sucks as a "car".

Beware the slippery slope: bigger tires will wear stuff out quicker, and they're far more likely to bend or break shit than 30" tires are. Along with the 35s and regearing, I'd gusset the front C's, sleeve or truss the front axle, seriously consider chromoly axle shafts, and be open to the idea of hydro assist steering. You can blow through 2-3 grand like <snaps fingers> that. And that $2-3K is if you DIY - if you're paying for labor, God help you


My 2 door 6MT Rubicon did great stock on the factory 32s with factory 4.10 gearing
Lifting it 2.5" and running those 32s / factory rims on 1.5" Spidertrax spacers was good.
Ran 35s for years with the 4.10s and it was good, but 4.88s really put it back to "sporty".
Stepping up to 37s with the 4.88s wasn't a huge performance hit, but I'd love some 5.13s or 5.38s
NOTE: all of those^ modifications cost me fuel economy, and made it a shittier road trip vehicle.

If it's a daily driver, don't go over 35s without a damned good reason (performance, not looks).
If you want fuel economy & don't wheel it, get the smallest tire you think "looks badass"

So . . . the answers to your questions rely entirely on what you're trying to accomplish


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post #22 of 25 Old 12-03-2019, 05:09 PM
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This thread is 7 years old.

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post #23 of 25 Old 12-03-2019, 07:46 PM
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This thread is 7 years old.

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No shit - the topic is twice as old (not counting Pentastar recalculation - I don't ).

Sure, they could'a searched but IMHO bumping an existing thread is far better than starting the 500th "gears for 35s" thread.

Meh, I tried to help. Now it's up to sprkeng to provide details so we can argue what's best

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post #24 of 25 Old 12-03-2019, 09:53 PM
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Hey thanks guys for the information,

My intentions for my JK are to make it look better, at times I get compliments on my Jeep as is now. I think the 265s look too small with the lift.

I'm ready for new tires the ones I have All Seasons are in need of replacement. I want something a little aggressive AT for going off road, but still be a semi-daily driver, my other car is a 1985 Porsche 911 summer only driver. I use my JK for fishing, grouse hunting and camping plus winter driving snow/rain. I go off road primarily on fire trails and dirt/mud trails. My old tires were ok for trails, but many times I wished I had a little more aggressive tires. I'm sold on the BFG KO.

I've talked to a few 4x4 shops and it's why I bought a 2.5 inch lift from 4WheelsParts, but they all said start with the lift. So it's lifted and leveled that I have started with. I've always wanted it leveled and the old suspension needed to replaced. So far my mpg is at 16.8 dropped a little.

Where I'm at right now is divided by two sides of opinions, some say 35's won't affect the gears on my rig, but it maybe sluggish, 2.5 lift is plenty of room, the other side says to me don't go past 33" it's a perfect size for stock gears and they look good on a 2.5 lift.

I've seen many JKs around town with 35s seems to be the go to size and they look good.
But my deal breaker could be to regear, It's not cost it's more like, do I open a can of worms..

I value your opinions or arguments. &#x1f60a;

(I'm trying Photobucket Below)

<a href="http://s1243.photobucket.com/user/sprkeng56/media/Mobile%20Uploads/C360_2017-04-16-09-00-46-985-01_zpsxuppwqlo.jpeg.html" target="_blank"><img src="http://i1243.photobucket.com/albums/gg554/sprkeng56/Mobile%20Uploads/C360_2017-04-16-09-00-46-985-01_zpsxuppwqlo.jpeg" border="0" alt=" photo C360_2017-04-16-09-00-46-985-01_zpsxuppwqlo.jpeg"></a>

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6-speed manual transmission,
Bestop Trex NX Softtop,
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post #25 of 25 Old 12-03-2019, 11:13 PM
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Quote:
Originally Posted by sprkeng View Post
Hey thanks guys for the information,

My intentions for my JK are to make it look better, at times I get compliments on my Jeep as is now. I think the 265s look too small with the lift.

I'm ready for new tires the ones I have All Seasons are in need of replacement. I want something a little aggressive AT for going off road, but still be a semi-daily driver, my other car is a 1985 Porsche 911 summer only driver. I use my JK for fishing, grouse hunting and camping plus winter driving snow/rain. I go off road primarily on fire trails and dirt/mud trails. My old tires were ok for trails, but many times I wished I had a little more aggressive tires. I'm sold on the BFG KO.

I've talked to a few 4x4 shops and it's why I bought a 2.5 inch lift from 4WheelsParts, but they all said start with the lift. So it's lifted and leveled that I have started with. I've always wanted it leveled and the old suspension needed to replaced. So far my mpg is at 16.8 dropped a little.

Where I'm at right now is divided by two sides of opinions, some say 35's won't affect the gears on my rig, but it maybe sluggish, 2.5 lift is plenty of room, the other side says to me don't go past 33" it's a perfect size for stock gears and they look good on a 2.5 lift.

I've seen many JKs around town with 35s seems to be the go to size and they look good.
But my deal breaker could be to regear, It's not cost it's more like, do I open a can of worms..

I value your opinions or arguments. &#x1f60a;

(I'm trying Photobucket Below)

<a href="http://s1243.photobucket.com/user/sprkeng56/media/Mobile%20Uploads/C360_2017-04-16-09-00-46-985-01_zpsxuppwqlo.jpeg.html" target="_blank"><img src="http://i1243.photobucket.com/albums/gg554/sprkeng56/Mobile%20Uploads/C360_2017-04-16-09-00-46-985-01_zpsxuppwqlo.jpeg" border="0" alt=" photo C360_2017-04-16-09-00-46-985-01_zpsxuppwqlo.jpeg"></a>
Pic check:



I made the "http" into "https" and dropped it into image tags^.


Your 2011 is a 3.8L, yes? If so, 33s on 3.21s may be a bit of a struggle - you'll have 90% of current RPM at any given speed / gear. 6th gear will be for downhill on the freeway above 60 MPH.

Here's the time-honored quick reference table:



Learn it, live it, love it

Sounds like 32s or 33s would accomplish what you say you need.
If you don't want to regear, take 35s off the table for now. 3.8L + 3.21s + 35s would bring the suck.
Maybe rock new "sensible shoes" for now, and plan to build up and regear for 35s next time around?

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