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Topic Review (Newest First)
03-31-2014 03:31 PM
Johnny Vintage If you are going to lower your Wrangler and put on smaller wheels like I did, the 3.21 is fine. I went from 18" to 16" to get the Jeep closer to the ground. My wife has a bum leg and she couldn't get into it stock. But she loves it so I had to do something. It actually looks kinda' cool lowered.
03-31-2014 02:51 PM
panthermark I do agree that sound and perception play a lot into this discussion.

No matter what ratio, these vehicles are actually fairly fast if you get the RPM's up. You just have to understand that you have a "car" engine in a truck.

Everyone cruises down the street at 1700-2200 rpms (green area), but the power really starts to come on when you start getting above 2500 rpms.

I did a couple of 0-60 runs a few weeks ago. If you stomp the gas from a stand still, it takes forever to get moving....especially with the drive by wire throttle (which also makes it feel slow). But if you get the revs up, it can move!

On my 2nd try, I did 0-60 in 7.55. This is in a stock, loaded 4 door Sahara...with a hard top and auto tranny. (But I do have LSD and 3.73's).
03-31-2014 02:37 PM
Mike_4462 I still have the stock 17" wheels and tires (waiting for them to wear out). Last fill-up I got 20.3mpg (hand calculated) with my 3.73's and that's with an 2.5" lift, AEV front bumper, skid plate, and a winch.

I say go with the 3.73's especially if you have the 6 speed.
03-31-2014 10:51 AM
Jimmy61 They don't offer 4.10 in a Sport, so you will spend $14,000 more for a Rubicon.

I picked a base sport with 3.21. I may not be satisfied, but it seems every body loves their jeep, but nobody loves it the way the factory delivers it, they just go and change it till its just what they want.
06-25-2013 07:01 PM
RTStanger I test drove both before buying my JKU a month ago and believe me, you want the 3.73s. They make a huge difference that makes driving it more enjoyable.
06-25-2013 06:47 PM
Welding Rod I drove 2 identical unlimiteds, except for color and gear ratio, back to back.

Ended up buying the one with the 3.21s. However this Jeep will never see bigger tires than the 255/75-17s it now wears.

Being a long wheel base this Jeep is not going to be used for crawling, only trailing so 31" plus tires are fine.

The auto trans does a great job with this combo. It takes a decent grade to get a down shift and the trans does so almost unnoticeably.
06-25-2013 04:44 PM
bloodfart
Quote:
Originally Posted by Strokerswild View Post

You have to be talking pre-'12 there. I drove a '10 JKU once with an auto and thought it was terrible....

My '13 (with slushbox) is no slouch, to be sure. Or maybe your gas pedal travel is limited....
No, i was looking at 2012 models, last july...
06-25-2013 11:37 AM
dubb77 3.73!!!! I just bought my jeep a week ago. 3.21 now that I am looking at the 35 inch tires I might need to re gear. If you end up in this boat you wish you did 3.73. You'll be better out of the gate for longer till you want to re gear. Just my $.02
06-25-2013 11:31 AM
Rude Robert
Jeep will not regear to 3.73??

Not only will they not re gear it, they says if I do get it re geared, it will avoid the warrenty. I though Jeep would re gear it??
06-24-2013 10:09 PM
tomthbomb
Quote:
Originally Posted by ohioviper View Post
Most people will never be able to tell the diff from 3:21 to 3:73.
Or the 3:73 to 4:10.

3:21 to 4:10 well, yes you can tell.

Actually more difference between 3:21 & 3.73 than between 3:73 & 4:10.
06-24-2013 08:43 PM
fastNugly
Quote:
Originally Posted by TOK View Post
I'm OK with the power of the Pentastar, but also pondered if the horses in the Jeep were small ones.

The Pentastar is rated at 285 horse/260 lb ft of torque. I have a 2 door Sport with a soft top, 6 speed and 3.73's. A relative speedster of the JK world.

I also have a crew cab Nissan Titan. Its rated at 305 horsepower and 385 lb ft. That initially seems like a huge torque advantage for the Titan, but it weighs about 1400 pounds more than the Jeep, has 2.93 gears and is saddled with an automatic transmission.

The Titan will flat out run away from the JK regardless of situation -standing start, 10mph rolling start, 50mph roll on, it just doesn't matter. I don't mean like gradually pull away either, it flat out blows the Jeeps doors off.

I read that Nissan tends to under-rate their horsepower (your Infiniti experience may also bear this out). Either that under-rating is true to the extreme, or the Jeep has some phenomenal driveline loss along with over-reported power.
Don't get me wrong. I love my JK but after driving it for 2 months now, I feel they are 'small horses' as you stated. Lol

My closes comparison is my Infiniti. 300hp and 265tq
But again, that 15hp diff seems much greater than that.
Oh well, can't win em all.

All I cam say, is I love my ram each and every time I get into it
06-24-2013 05:38 PM
ohioviper My other vehicle is a 2012 Ram with 390hp Hemi. Yep it will womp all over this 3.6 in seat of the pants feel and sound. But the 3.6 is no slouch and in side by side drag will hang with it decent to about 55 and then the Hemi starts walking off. Perception is a good bit of it and the v8 sound plays into that Im sure.

I feel for a Jeep it is very quick. My 79 304 CJ7 sounded a lot meaner but I am sure it was slower than this 3.6 auto/ 3:21 Im now driving.
06-24-2013 04:03 PM
TOK
Quote:
Originally Posted by fastNugly View Post
I have the 10A Rubi in auto with the 3.73 and the stock 265/70/17 (31.7") tires and I am not liking my so called 'lack of power'.

Pls let me explain as this will not fit everyones comparison.

I also have a '12 Ram with a Hemi and 4.56 gear and running 37's and my truck as SOO much more pull.
So its not a fair comparison, but I also traded in a '10 Infiniti FX35 with 15HP more and the 15HP less in the JKUR feels far less.....so I dont know
I'm OK with the power of the Pentastar, but also pondered if the horses in the Jeep were small ones.

The Pentastar is rated at 285 horse/260 lb ft of torque. I have a 2 door Sport with a soft top, 6 speed and 3.73's. A relative speedster of the JK world.

I also have a crew cab Nissan Titan. Its rated at 305 horsepower and 385 lb ft. That initially seems like a huge torque advantage for the Titan, but it weighs about 1400 pounds more than the Jeep, has 2.93 gears and is saddled with an automatic transmission.

The Titan will flat out run away from the JK regardless of situation -standing start, 10mph rolling start, 50mph roll on, it just doesn't matter. I don't mean like gradually pull away either, it flat out blows the Jeeps doors off.

I read that Nissan tends to under-rate their horsepower (your Infiniti experience may also bear this out). Either that under-rating is true to the extreme, or the Jeep has some phenomenal driveline loss along with over-reported power.
06-24-2013 03:19 PM
Strokerswild
Quote:
Originally Posted by bloodfart View Post

When i was test driving, the 3.21 geared JKU felt ok for someone that wants to peacefully and serenely glide through their early retirement, and overall had no guts. I would not drive it daily, i would die of boredom in it especially if paired to a slushbox; then again, i actually enjoy driving, while others only care about reaching their destination and pinching pennies on gas.
You have to be talking pre-'12 there. I drove a '10 JKU once with an auto and thought it was terrible....

My '13 (with slushbox) is no slouch, to be sure. Or maybe your gas pedal travel is limited....
06-24-2013 02:38 PM
bloodfart I have 3.73s and thought they were GREAT. Added an MBRP roof rack and ARB roof tent, along with some ACE sliders, and now i cant get up almost any bigger hill in 6th without having to downshift or without accepting that i will lose a lot of the speed i had coming in before the hill.

When i was test driving, the 3.21 geared JKU felt ok for someone that wants to peacefully and serenely glide through their early retirement, and overall had no guts. I would not drive it daily, i would die of boredom in it especially if paired to a slushbox; then again, i actually enjoy driving, while others only care about reaching their destination and pinching pennies on gas.
06-24-2013 02:18 PM
RoadiJeff
Quote:
Originally Posted by Strokerswild View Post
I have yet to regret my 3.21s.....
Same here. Our 2013 Sahara came with 255/70/18 (32.1") tires, 3.21 gearing and auto.

It's my wife's DD and she likes it a lot better than her old turbo GT Cruiser that she traded in, especially the tight turning radius. We've gotten close to 24 mpg on the highway with it and are quite happy with the 3.6L and its 285 hp performance.
06-24-2013 11:27 AM
fastNugly I have the 10A Rubi in auto with the 3.73 and the stock 265/70/17 (31.7") tires and I am not liking my so called 'lack of power'.

Pls let me explain as this will not fit everyones comparison.

I also have a '12 Ram with a Hemi and 4.56 gear and running 37's and my truck as SOO much more pull.
So its not a fair comparison, but I also traded in a '10 Infiniti FX35 with 15HP more and the 15HP less in the JKUR feels far less.....so I dont know
06-24-2013 10:48 AM
mackdj1
Quote:
Originally Posted by fastNugly View Post
Correct. Penstar, damn auto and purchasing in Canada, I can't get the upgraded 4.10
Before jumping to swap gears curious how 35's and 3.73 function as a DD?

Glad it won't be too bad! I guess I'll try and if its bad, swap gears.
I got 35's with 3.21 in a 2012 JKU. As a DD no big deal, still has lots of power but towing is another story. I plan to regear to 4.88 over the winter
06-24-2013 10:27 AM
Martin10 I test drove every configuration before buying my 2013 with stock 29 inch tires and 3.21. gears. This is about the perfect setup for me. I felt the 3.73 were too much on the highway with the 29 inch tires. The thing is, there are people on this forum who just will not accept that anyone would be happy with the 29 inch tires. But I am and can assure you I will not be putting larger tires on it. If I did, those who prefer the 3.73 gears are absolutely right.
06-24-2013 10:16 AM
Strokerswild I have yet to regret my 3.21s.....
06-23-2013 07:57 PM
ohioviper Most people will never be able to tell the diff from 3:21 to 3:73.
06-23-2013 06:38 PM
Bayouwolf This topic always cracks me up.

I love how people use the excuse of "you're gonna get the mod bug" and suddenly everything on the Jeep is fair game, EXCEPT the gearing. Zod forbid you trifle with those!!! THE HORROR!!!!

If the question raised was "Should I get a Rubicon or a Sport" you'd hear people telling you how 3.73 is weak, pathetic and has no power and only 4.10's would do.

If you're going to wheel it more often than not, get the 3.73's. If it's going to be a DD with the occasional trip out to the lake or up that logging trail to go hunting, the 3.21's are going to be more than adequate even if you decide to upgrade to 33" tires and a mild lift.
06-23-2013 04:47 PM
dmako Fill her up with people, turn on the AC, head up a hill the 3.73's will be worth it.
06-23-2013 03:33 PM
JK-linux I just drove home a new Flame Red 2013 JKU Sahara yesterday. It has 3.73 gearing. My other option was a nearly identical Black JKU Sahara which had 3.21 gears - otherwise identical in the drivetrain. I chose mine partly due to the gears. The 3.73 gears made for a quicker Jeep, based on the seat of my pants and how the auto tranny was choosing to shift, even on the highway. Go figure.
06-23-2013 03:28 PM
Sucker Punch Like all the others have said. If you are going to drive it around stock for the time you own it then the 3.21 is fine. BUT, I would still recommend getting the 3.73 gears as the bigger tire and small lift bug gets into your head...
06-23-2013 02:54 PM
Porktownff51 I have the 3.73 and my buddy 3.21 different animals on road(his is a mall crawling stock 12, mine a soon to be lift 13 jku that gets around) but if your building it out the gate why spend the money on 3.73 if you know you're going to regeat
05-02-2013 04:33 PM
panthermark I test drove 2012 Sahara JKU's back to back. One with 3.21's, one with 3.73's. The only differences between the two Jeeps were the color, and one had a 730 while the other had a 430. Not really a huge difference between the two.

If I were getting a 2 door auto that was going to stay stock and be used as a DD, I would probably get 3.21's.
05-02-2013 04:20 PM
dmako You could order and get the 3.73's took me 4 weeks.
05-02-2013 01:16 PM
fastNugly at the end of the day too, gears are swappable and if that 'mod bug' hits, Im sure 3.73 wont be enough....LOL

I dont have mine yet and I know I will swap out from 3.73 to 4.10 or 4.56 with 35's

So my stock gears may go on sale shortly after taking delivery of my JKUR
05-01-2013 10:29 PM
JeepHerz 3.21s are just fine stock. Nothing wrong with them.
However for minimal $$ you can purchase 3.73s as insurance against the Jeep modification bug. It will drive better. And you'll experience little, if any difference in MPG.
I've yet to see a single "I regret 3.73" posts. Search 3.21s and get a hundred or so.
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