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Old 03-12-2014, 02:54 PM   #1
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I will keep this short, I've read a lot of threads but none really adress 2012+ models. I have a 2014 sport unlimited with 3.21 gears, I want to run 35s so what should I regear to , to feel as close to stock as possible?

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Old 03-12-2014, 03:29 PM   #2
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Is it a stick or auto? I have 3.21's and 35's ('12, manual). It's not as bad as people make it out to be but there is a pretty substantial power loss. I currently have 4.56's being installed and will have it back Friday so I'll check back in.

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Old 03-12-2014, 03:37 PM   #3
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I have an automatic!
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Old 03-12-2014, 03:41 PM   #4
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I had 3.73's on my 13 auto and now have 4.56's. I'm on 35" KM2's. If it's a driver then 3.73s would be my bottom choice. I got pretty good mileage out of these. But I rock crawl and the 4.56's cost me some gas mileage but it does crawl better.
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Old 03-12-2014, 04:51 PM   #5
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I have a 2013 JKU auto and just recently had 4.56's installed. If I was to do it again I would go with 4.10's, but mine will not see any hardcore off roading.
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Old 03-12-2014, 04:56 PM   #6
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So 4.10s to keep optimal feel? There are no serious rocks to crawl around here so mainly highway along with some light-moderate trails
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Old 03-12-2014, 05:08 PM   #7
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Staying close to stock depends on what size tire you're running now.

If you're going from the smaller stock 225/75R16, you'd do this math:

3.21 * 35 / 29 = 3.87 => 3.73 or 4.10

If you're going from the larger stock 255/75R17, you'd do this math:

3.21 * 35 / 32 = 3.51 => 3.73


Now, I'll tell you that most people will say that if you're going to go through the trouble of regearing, you don't want to waste the time and money to go with 3.73 gears. Just go ahead and get 4.10 gears (or more) and be done with it. The 3.21 gears are inadequate and you don't want to keep that level of performance. Going shorter (higher numbers) with your gears will give you better overall performance with no real drawbacks. So rounding up to 4.10 is the minimum most people would suggest.

I'll tell you that my own personal experience daily driving my own personal 2012 Jeep with 4.56 gears and 35" Goodyear Duratrac tires (315/70R17) is a pretty good combination. I run just fine down the highway without revving the engine too high.

Others have been happy with 4.88 gears.

I'd say you would be happy with anything from 4.10 to 4.88 depending on what you want out of your Jeep.
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Old 03-12-2014, 05:21 PM   #8
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Put the tires on and run em for a while. I have 3.21's and 315 duratracs on now. It isn't terrible but it is far from great. I am regearing later this year also and will probably go 4.56. You should be OK with 4.10's but if you are looking at 37s in the future then 4.56 will be your new minimum.
The 3.6 pentastar has a ton of power and automatic (what I have) makes up for alot of sins. You can still use the tranny like a manual to select the best gear when it bogs so it isn't bad. I really would wish they never put 3.21's in a Wrangler, really stupid.
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Old 03-13-2014, 05:00 AM   #9
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Quote:
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I really would wish they never put 3.21's in a Wrangler, really stupid.
the Most True statement about the JK's so far. im in a manual 2012 JK 2D
nxt week im putting Yukon's 5.13 and Eaton Lockers front and back. 35's running 3.21, just is wrong on so many levels.
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Old 03-13-2014, 06:09 AM   #10
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Mine still has the stock Rubicon tires with the 4.10, and it performs great both on highway and off.

One of the fellows that I run with has the heavy 2012 4 door Rubicon, with the 4.10 and 35s. He seems to do just fine with that set up. About a month ago, we did some rock crawl up in our mountains, and wherever I went, he stayed right with me!

Now gas mileage is a different issue!!!!!!
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Old 03-13-2014, 12:32 PM   #11
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Originally Posted by Silverback51 View Post
I have a 2013 JKU auto and just recently had 4.56's installed. If I was to do it again I would go with 4.10's, but mine will not see any hardcore off roading.
What size tires are you running? What makes you feel like 4.10's are the better choice?

I have a 14' auto unlimited running 33's.
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Old 03-13-2014, 03:53 PM   #12
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What size tires are you running? What makes you feel like 4.10's are the better choice?

I have a 14' auto unlimited running 33's.
315/70-17 Goodyears.

Forgot to answer your second question. While it does not bother me that much, I do not really like to cruise at 3000+ RPM's.
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Old 03-13-2014, 05:14 PM   #13
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315/70-17 Goodyears. Forgot to answer your second question. While it does not bother me that much, I do not really like to cruise at 3000+ RPM's.
Thanks for the response. Mine is a DD so I'm running 33's. I was really considering 4.56's in case I ever went to 35's but now you've got me thinking 4.10's again. I've had this debate in my head a 1000 times!!!
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Old 03-13-2014, 07:08 PM   #14
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It depends how frequently you drive over 65, 75, or 85 mph.

If you run 3k rpm at 75 mph with 4.88s and 35s, you shouldn't care if it only happens once a month for an hour.

You would care if you commute 80 miles a day at 75 mph.

If you rarely drive faster than 65 mph, you will benefit from the lowest gears (highest numerical value) possible. You will have better performance and fuel economy in-town, and better performance off road.

I live at 3,500 ft above sea level and drive 10,000 ft above sea level mountain passes from time to time. I drive over 60 mph, maybe once a week. I drive over 75 mph, maybe once a month. I never drive over 85 mph. My favorite offloading is rock crawling, where I want the highest numerical value crawl ratio possible. I'd run 4.88s or 5.13s with a '12+ JK on 35s. 4.10s, and even 4.56s would be stupid for someone in my situation.

However, I would want completely different gears if lived at sea level, commuted 80 miles per day at 85 mph, and only did rock crawling once every year or two. I'd probably do 4.56s, or with a lighter rig, 4.10s with 35s. It would be stupid for someone in that situation to do 5.13s or 4.88s.
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Old 03-13-2014, 11:41 PM   #15
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I have 3.73s and 315 70 17 GY Duratracs. Been evaluating for 8 months for the best ratio on a regear. I live at 8500 feet drive between 5500' and 9000' wheel up to 13,500' or more and spend alot of time highway driving between 60 and 75 mph. The jeep does well off road about 75% of the time, but the 3.73's cause it to bog down on long steep hill climbs when off road and in the snow and mud. It also suffers somewhat on a long hill pull on the highway. My thought is a 4.10 ratio will only be a slight improvement and 4.56's will be a better option in my case. If it was not for all the highway driving I do I would go with 4.88's but I still want to keep the highway rpm's as close to 3000 rpm's as I can at 70-75.
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Old 03-14-2014, 12:08 AM   #16
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I have 3.73s and 315 70 17 GY Duratracs. Been evaluating for 8 months for the best ratio on a regear. I live at 8500 feet drive between 5500' and 9000' wheel up to 13,500' or more and spend alot of time highway driving between 60 and 75 mph. The jeep does well off road about 75% of the time, but the 3.73's cause it to bog down on long steep hill climbs when off road and in the snow and mud. It also suffers somewhat on a long hill pull on the highway. My thought is a 4.10 ratio will only be a slight improvement and 4.56's will be a better option in my case. If it was not for all the highway driving I do I would go with 4.88's but I still want to keep the highway rpm's as close to 3000 rpm's as I can at 70-75.
If your tires measure 33" mounted, at 70 mph, 4.88s would put you at 2888 rpm and 5.13s would put you at 3036 rpm.

If your tires measure 34" mounted, at 70 mph, 4.88s would put you at 2803 rpm, and 5.13s would put you at 2947 rpm.

In either actual mounted tire size, 4.88s would only make around a 180-190 engine rpm difference at 70 mph.

Given your circumstance, I'd do 4.88s if I were you, and if you find the rpm too high, slow down 5 mph--especially if there is ever a possibility you will consider larger than you current tire size.
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Old 03-14-2014, 09:39 AM   #17
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I live at 3,500 ft above sea level and drive 10,000 ft above sea level mountain passes from time to time. I drive over 60 mph, maybe once a week. I drive over 75 mph, maybe once a month. I never drive over 85 mph. My favorite offloading is rock crawling, where I want the highest numerical value crawl ratio possible. I'd run 4.88s or 5.13s with a '12+ JK on 35s. 4.10s, and even 4.56s would be stupid for someone in my situation.

However, I would want completely different gears if lived at sea level, commuted 80 miles per day at 85 mph, and only did rock crawling once every year or two. I'd probably do 4.56s, or with a lighter rig, 4.10s with 35s. It would be stupid for someone in that situation to do 5.13s or 4.88s.
This.

I live in the flatlands of fly-over country, at a whopping 800 feet above sea level. I daily drive my 2012 JK but I live and work in town so my commute is short to say the least. I'll get up to 70-75 on the freeway once in a while. I do a little bit of off roading but around here in farm country with no mountains and not much public land, my options are limited. I chose to go with 4.56 gears to match my 35" tires. It's a great all-around option for driving my Jeep around here.

I'm planning a Moab trip this summer and I may hit some trails in Colorado as well over the years. But my trips will be just short vacations maybe once or twice a year. I'll probably have to do a lot of down shifting when I get into the mountain passes. My gearing/tire combination will probably be "adequate" for those trips but certainly not optimal. But given how much I drive this Jeep back home, I'm fine with that.
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Old 03-14-2014, 10:17 AM   #18
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I have a 12 JKU on 35" tires and 4.88 gears. I drive on the highway very infrequently, so my Jeep hardly sees 75 mph and I have not driven more than 100 miles in one day in a long time. I think 4.88s and my current setup are perfect for how I drive, which is pretty slow.
edit* the last time I had my Jeep weighed, doors and roof on with trail gear I was at 5300 and change.
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Old 03-14-2014, 06:34 PM   #19
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Just got my jeep back from the shop. 4.56's were the perfect choice for me. It has plenty of power now and the rpms are not jacked on the highway.
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Old 03-14-2014, 07:26 PM   #20
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Just got my jeep back from the shop. 4.56's were the perfect choice for me. It has plenty of power now and the rpms are not jacked on the highway.
Thanks for the confirmation!

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