33"tires w/4.10 or 4.56 gears witch do you have - Jeep Wrangler Forum

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Old 04-08-2014, 09:47 PM   #1
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33"tires w/4.10 or 4.56 gears witch do you have

Hey jeepers I have a jk w/3.21 gears need to upgrade I want to go with 4.56 gears but wondering if they will be to low in 1st gear so I was wondering witch ones you have and what you think of them thanks for your help.

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Old 04-09-2014, 07:16 AM   #2
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We have a 2014 JKUR with 4.10's and 33's. I feel these work great together. We have made a couple trips to Co up into the mountains and have not had any loss of power issues.

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Old 04-10-2014, 09:35 AM   #3
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Thank you Jeepers29 out of over 100 views you were the only one kind enough to give your opinion happy trails.
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Old 04-10-2014, 10:04 AM   #4
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You don't say what year, so we don't know what engine you have. I can say that I ran 32s about 1 week with 4.56s before I got my 35s. In my 2010 with a 6 speed, 1st gear was useless
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Old 04-12-2014, 11:17 AM   #5
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I have a 2014 with the 3.6
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Old 04-13-2014, 05:27 PM   #6
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Here is the chart for your jeep. For a manual, 3.6L, I think 4.56s would be too much for 33s. But I'm just going off of numbers, your best bet is to find someone that has one and drive it.

The other question concerns tire size, if you plan on going larger, you may want to live with the 4.56s/33s so you don't have to regear again.
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Old 04-13-2014, 08:32 PM   #7
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I have 32s and 4:10s in my Rubi with an auto. It felt a little wound to tight, if you know what I mean, when I got it compared to my TJ. It's a been a few weeks and either I've gotten used to it or the drivetrain has loosened up a bit but itstill seems to rev a little high on the highway. Plenty of power so I'm thinking the 4:10s with 315/75/16s, my planned tire upgrade, will be just right. With 33's, I'd bet 4:10s are about right but like George said, if you plan to go bigger you might consider the 4.56s but I don't think you'll need them unless you go to 37s. As always, YMMV. It's really a personal thing.
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Old 04-13-2014, 08:44 PM   #8
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I have a 14 jkur with 4.10's and auto and it was perfect with stock tires and with 34's tires. I typically travel 70-80mph and feels right in the sweet spot. If i were going to go bigger tires I think I would want higher numerical gearing. 3.6L like to rev.
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Old 04-22-2014, 06:57 PM   #9
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Thanks guys for the info and I'm am torn because I might want to go to 35s later I wonder how the 410s work with 35s
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Old 04-22-2014, 07:23 PM   #10
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If you are going to 35s, I would get 4.56s
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Old 04-22-2014, 07:28 PM   #11
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Love my 4.56s w 35s
Took the kids 150 miles to the lake and back this weekend and even with some nice hills I finished at 17.1 mph running 60-75 through the trip
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Old 04-22-2014, 07:37 PM   #12
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Another vote for 4.56 if you're going to 35's. I think it's a perfect combo.
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Old 04-22-2014, 08:05 PM   #13
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Some tips:

1. Do you drive hills regularly? Do you live in the mountains, or the Midwest? It makes a difference. If you drive primarily flat earth, yeah, the 3.21s are a dog, but unless you're gonna go to 4.56, or are rich, there's no real reason to change. From my experience, 33s are fine with the higher gears offered by Chrysler. Ideal? No, but unless you know you're gonna go to 35s, adequate.

2. If you blow off the above, and decide to go lower, make damn sure you get it right, once. A gear change will run you anywhere from 1-2K, depending on your location. You can't take it back, remove it, or call a timeout. You'll have to adjust your driving habits for awhile to let the gears set, and perform regular maintenance.

3. As mentioned in previous posts, go too low and you're screwed. Your Jeep will scream like a cheerleader. Short of spending another 1-2K, you'll be stuck with it. Do it one time, and get it right, or pay the price.

4. Assuming you decide to do it, find a mechanic with experience. Tell him you want a master kit, including extra pinion bearings and crush sleeves, for when the stockers get trashed.

5. Buy the gears through the mechanic, to keep the warranty chain intact. Most gears are made by CHA Industries, so there's not really a quality issue.

6. You're "thinking about" 35" tires...which means you'll eventually go there. For 35s, and the current Pentastar engine, I wouldn't go lower than 4.56 gears (higher #, lower gears), unless you live in the mountains or plan on towing regularly. Personally, I think 4.10s would be ideal, but that's really not cost effective.

7. The chart in the post above is handy...and not much more. You'd be wise to note your standard rpms on the road, over time, for the way you drive, and extrapolate.

This, really, is a very simplified version of things to take into account when considering a gear change. Not as easy as it sounds.

Good luck.
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Old 04-22-2014, 08:32 PM   #14
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I'm running 4.10's in a 2014 JKUR with 33" Dick Cepek Mud Country tires and it is perfect in my opinion.
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Old 04-23-2014, 08:57 AM   #15
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My 315/70R-17s measured 33.5" when I was recalibrating with Procal. I have 410s and was a little concerned so I took it up to 10,000 ft to see how it performed. It was fine, there's a hill that has a 13% grade, went right up it, no lugging.
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Old 04-23-2014, 01:47 PM   #16
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I had 305/70s (a KM2 so 33.5") with 4.56s for a couple of months. We all make a huge deal out of 200 or so RPMS- and its over-rated. Sorry- I disagree with the screaming cheerleader analogy. Have someone drive your Jeep and don't look at the RPMs. Willing to bet you can't tell the difference between 2500-2900. Everyone seems to forget the Jeep torque curve at this range is flat as a pancake. It isn't a Honda folks. It might make a scintilla of difference in MPG but its a Jeep.
I went to 35s expecting some huge difference. I barely noticed- and the difference might've been in my head because I expected a change.
Get 4.10s if you're worried about MPG.
Get 4.56s for performance or 35s.
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Old 04-23-2014, 11:33 PM   #17
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It's the age old issue of bigger tires, bigger lift, bigger tires, …

If you have any thoughts of ever going to 35s then 4.56 is a perfect match as others have said. The 4.56s will feel slightly short with the 33's but worth it if you ever switch to 35s as many do unless you've been there before.

You will be happy with either decision unless you count every 1/10th of mile in fuel economy.
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Old 04-24-2014, 12:05 AM   #18
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Have pulled three thousand pound trailers through the Texas Hill country 65-70, up steep rough ranch roads. Have taken it to several ORV parks and drove it where they told us we should have lockers and didn't. Its an automatic, its a JKU, and its got 3.21s in it. No issues with power and the 33s we have had for 13K miles. With the combination we have I do not see a need for a gear, although going to a 35" probably would require it. We don't hammer it off road so maybe thats why I don't miss it. We go slow and careful and don't get in much of a hurry, the rocks we have delt with would probably destroy the tires and suspention if we did anyway. Our mileage also really is not any better than the mileage people I see posting here either. 17-18.5 mpg city/roads 19-20 Highway and 21 if I draft a semi.
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Old 04-24-2014, 11:48 AM   #19
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Hi bonecollector you say your getting 17-18 in the city with 3.21 gears and 33s do you have a lift because I have the same set up with a 3" lift and I only get 14 miles in the city and it's a 2014 jk.
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Old 04-24-2014, 12:13 PM   #20
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Is anyone running 33's and 4.56 gears out there the reason I ask is because I might go with 35's later but it won't be for a while because I have new 33's now so I'm wondering do I just do 4.10s now and run 35's on those much later or do I run 4.56 now with the 33's and 35's much later thanks again for your opinions
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Old 04-24-2014, 12:27 PM   #21
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Not really related to your question but I'm running 33's on 3.73's (With Pentastar/Standard) and have no issues at all. I plan on regearing to 4.88 for when I end up with 37's. Only want to re gear once. lol
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Old 04-24-2014, 01:58 PM   #22
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Yeah I only want to re-gear once too that's why I am so torn on which way to go.
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Old 04-24-2014, 03:38 PM   #23
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Quote:
Originally Posted by Hockeydad55 View Post
Yeah I only want to re-gear once too that's why I am so torn on which way to go.
My vote is for the 4.56.

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