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Topic Review (Newest First)
03-13-2012 11:27 PM
21edupej I did a lot of research before I bought mine. I have the Manual 6 speed with 3.21s. I also have the 16 inch steelies with 29 inch tires (which I know I'll get flack for, but I don't plan on changing them any time soon because they are uber quiet and ride great!)

In any case, I really like the 3.21s. I get great gas mileage, the thing will REALLY move, has no problem going fast on the highway, will jump easily and quickly from 60 to 80 mph on the hwy without dropping a gear. It shifts like a dream (for a 4x4). It is quite possibly the perfect city Jeep!
03-13-2012 11:16 PM
3JKs1H1 A 3.6 with a 3.21 used on a daily driver is probably fine, want to rock crawl, put in the Rubu's tcase and go from a 2.72:1 to 4:1. But I'd just drive it first and see if you really feeal any need (on streets or trails) to regear.
03-13-2012 09:18 PM
mike4605
My experience with 3.21 and 3.73

Quote:
Originally Posted by jeepguy8888 View Post
Just got a call from my dealer my Jeep is ready for pick up on the 16th. I made a modifcation late in the order from 3.21 to 3.73 however I don't think the modification was done in time for the build. So I am expecting the 3.21.

Can anyone let me know what positives I can expect? I don't plan to tow. Off-Roading yes but I will keep the jeep stock. No Lifts and not planning to get bigger tires in short term and long term.

Is there any good points to having the 3.21?
I can tell you my experience with 3.21 and 3.73 in a 2012 6 speed. I purchased a new 2012 on 12/31. I ended up going with 3.21s as I thought it would get better gas mileage as I do a lot of highway driving. I didn't know about these wrangler forums until I started researching why my wrangler wouldn't maintain 75-80mph in 6th on highways in Kansas. I would either have to downshift and run up RPM or go over 85 MPH to keep the RPM in a range where there was adequate torque. I was quoted $3,500 to change the gears by the dealer (and it would void the axle warranty). My dealer let me take a 3.73 on a 140 mile round trip (my commute) and I got better gas mileage with the 3.73 as I could keep it in ECO mode the entire trip. Not much better, but not worse. Fortunately, I had a great dealer that told me it would be a lot cheaper to simply trade the first 2012 in on another one. They worked me a good deal and ordered me a 2012 with the 3.73 (I added ltd. slip while at it). They let me drive my first 2012 during the 6 weeks I waited. That saved my bacon. I get reimbursed for mileage, so my out of pocket (after mileage reimbursement) to do the trade in was negligible. I am much happier with the 6spd with 3.73. It is quite a bit quicker off the start and rolls at 75-80 in a good RPM range for highway use (up low hills or into wind). On a flat highway, the 3.21s worked fine, but once you introduce hills or wind, there isn't enough torque to maintain speed or accelerate as well as I wanted. I would have thought about going with 4.10s if it was available (I didn't want to go up to a Rubicon).

I want to be able to tow and my 2 door with 3.21s only had a towing capacity of 1,000lbs per the manual. The other positive about the 3.73s is that it is easier to drive for my wife. The 3.21s took a little more clutch/gas work.

The one positive I can say is that when I hit about 4,000 miles, the 3.21s felt a lot better than it did in the beginning. It was a lot more tolerable after I put at least 3,500 miles on that motor as it seemed to run better after that break in period.

I don't think the 3.21s are horrible, but I am definitely happy I traded mine in for the 3.73s. That is only my 2 cents, but in the last 3 months, I have owned both. I haven't put nearly as many miles on the 3.73, but I think it will only get better once the motor is broken in.

All of that being said, this is a 2nd vehicle for me, so I won't drive the 2nd new one on a daily basis. Take all of that for what it is worth, but thought I would share my experience.
03-13-2012 09:17 PM
jeepguy8888 Thanks for all the info!!!

I don't know if it's the 3.21 or 3.73 my guess order was modified to 3.73, however it was already in d1 status when I made the request.

Either way ill take what it has based on the info here ill be ok with either.

Had a tj 2003 manuel with the4.0 and I found it moved well for a jeep never lacked power. When I soldiers last year I was ready to pick up the 2011. Then I read they were changing the engine so I decided to postpone.

Friday its ready for me, and can't wait. Just wanted to assure myself either 3.21 or the 3.73 I would still be happy
03-13-2012 09:09 PM
cu in oz I have 3.21's and frankly its fine. I get great milage, no issues with power and I tow my 14 alu boat everywhere. Whats not to like?
03-13-2012 08:53 PM
New2012JEEP I got the 2 door and Merc auto, pushes the 3.21's nicely imo.
03-13-2012 08:47 PM
Thumper2012 We got the Arctic 6 speed manual and the 321's, did not like them from day one for us,
we went 373's and it now drives like I thought it should have from the beginning.
03-13-2012 08:39 PM
VaderJK12
Quote:
Originally Posted by New2012JEEP View Post
Yep, you will be fine. This was really soft sand too (If you were walking in it, your feet sank to your ankles soft), and we helped get a little Mazda 4x4 unstuck. Never even gassed it, 4lo and idle speed did the work. I pass people pretty easy on freeway if I need to, and at 4k miles, it doesn't feel sluggish at all. I think some of the programmed break in stuff affects the way the Pentastar runs. I want to say I have passed that, seems so smooth now.

BUT...If you plan on being on any kind of decent inclines, with rocks, or disconnected sway, I would say get the higher gear ratios. I don't plan on rock crawling myself.

I let the boards get to me, then I just stopped reading the Gears threads, and it passed, ha.
Ok awesome. I have no worries now. I don't have any plans rock crawling either. I appreciate your help.
03-13-2012 08:39 PM
kjeeper10 Only positive I see, I don't have them
03-13-2012 08:34 PM
New2012JEEP
Quote:
Originally Posted by VaderJK12 View Post
That's all I need to hear I have the 3.21 and want to make sure I'm good on the beach
Yep, you will be fine. This was really soft sand too (If you were walking in it, your feet sank to your ankles soft), and we helped get a little Mazda 4x4 unstuck. Never even gassed it, 4lo and idle speed did the work. I pass people pretty easy on freeway if I need to, and at 4k miles, it doesn't feel sluggish at all. I think some of the programmed break in stuff affects the way the Pentastar runs. I want to say I have passed that, seems so smooth now.

BUT...If you plan on being on any kind of decent inclines, with rocks, or disconnected sway, I would say get the higher gear ratios. I don't plan on rock crawling myself.

I let the boards get to me, then I just stopped reading the Gears threads, and it passed, ha.
03-13-2012 07:58 PM
jp2611 I have 3.73s in a TJ different motor different suspension different tranny but....I like my JK with the 3.21s 18-20 around town and 22 mpg on the highway

I like my TJ IN THE DIRT
03-13-2012 07:49 PM
Celtic
Quote:
Originally Posted by kbwwolf View Post
You'll be able to smoke an Edsel from a dead stop.
kbw is absolutely right!

1958 Edsel acceleration times when equipped with the E-475 and automatic transmission (From Motor Trend):

0 - 60 MPH in 9.7 seconds

And for those of you participating in the Spring Nationals at the end of April in the Great Lone Star State, you have the quickest Wrangler yet:

2012 Jeep Wrangler Sport (Manual) (From 0 - 60 Times):

0-60 mph 6.6 (Quarter Mile in 15.0)

Can't wait for you guys to bring home some of the rightfully deserved and long-awaited hardware.
03-13-2012 07:07 PM
daggo66 You saved 50 bucks! Your payments will be a penny or two lower now.
03-13-2012 06:45 PM
KicknJip I got the 3.21 gears on my '10 2 door with manual 6 speed. Stock setup I had no problems. I just put 33's on her and the only thing that changed from stock is when going up step bridges or over-passes at highway speeds. I have to downshift to 5th for those now if I want to maintain speed. Any other time the difference is not noticeable! Bottom end power appears to be the same in all the other gears.

I'd keep the 3.21 set-up unless ur paying extra for the change to 3.73. Then I'd want what I'm paying for!
03-13-2012 06:28 PM
VaderJK12
Quote:
Originally Posted by New2012JEEP View Post
I thought long and hard, about regearing, then dropped it. The jeep is still fast with 3.21s, and has the power to push through deep soft sand. Rock crawling, I would say regear.

The board hype on gears will get to you if you let it.
That's all I need to hear I have the 3.21 and want to make sure I'm good on the beach
03-13-2012 06:22 PM
WarEagle I think you will be fine. I regretted not getting the 3.73 rear end on my F-150, ended up with the standard 3.31 with the new 5.0L and it has been fine! I think the Pentastar V-6 goes a long way in helping with the 3.21 rear. I did get the 3.73 on my Wrangler, but test drove one with the 3.21 and was not disappointed. Decided if I was ordering, might as well get the bigger rear this go around. Don't regret, enjoy your new ride!
03-13-2012 04:51 PM
Akinvegas I think that is the funniest thing I have ever read on this site. ^^^^^^^^^^^^
03-13-2012 04:38 PM
kbwwolf You'll be able to smoke an Edsel from a dead stop.
03-13-2012 04:31 PM
JKatfish You can check the status update using your VIN or VON. I made a change to my order as well but they got it in and showed up as to what the build was. Hope all the fretting is over nothing.
03-13-2012 04:26 PM
greenjeepgurl87
Quote:
Originally Posted by New2012JEEP
I thought long and hard, about regearing, then dropped it. The jeep is still fast with 3.21s, and has the power to push through deep soft sand. Rock crawling, I would say regear.

The board hype on gears will get to you if you let it.
03-13-2012 04:16 PM
New2012JEEP I thought long and hard, about regearing, then dropped it. The jeep is still fast with 3.21s, and has the power to push through deep soft sand. Rock crawling, I would say regear.

The board hype on gears will get to you if you let it.
03-13-2012 04:02 PM
greenjeepgurl87
Quote:
Originally Posted by jeepguy8888
So if I keep it like this the 3.21 will pretty much be enough for my usage?

The 3.21 is slower...however is that noticable?

I am trying to cheer myself up!
Nope. Drove my buddies with the other 3.73 gears, and there isn't much difference.
And from what I've been told you can get 33s on it and still keep on truckin nbd
03-13-2012 04:02 PM
rics1997 Only real positive to 3.21 IMO is for the offroad shops getting money for regearing

You don't necessarily get better gas mileage either depending on your driving habits. 3.21 can make the engine lumber under strain and down shift more often if you don't take it real easy

I actually got better gas mileage in the city, when I went to lower gears. Highway depends on how level the highway is. A lot of hills still didn't give me better mileage on old gears but flat or downhill did lol. Overall I gained .5mpg in city and lost 1mpg on highway by going from 3.73 to 4.88 gears
03-13-2012 03:59 PM
pdubois64 I got caught with the 3.21's as well. I had an 09 auto and ASSumed that they still came standard. Oh well, still has more power than my 09 and because it's my DD I like that it revs at ~2000 rpm @ 65 mph. I'll take the better gas mileage
03-13-2012 03:59 PM
jkjeeper06
Quote:
Originally Posted by C.L.
*If you have 3.73 in writing from any point during the ordering/building process, bring it with you and push for a swap prior to delivery.
Good idea. If you put it on the build sheet it needs to have it. Based on this you could possibly refuse delivery and re order.

Personally I'd take the 3.21 especially since you want it to stay stock. You'll get the best mileage out of it with that which will leave you more gas for wheeling!
03-13-2012 03:51 PM
C.L. The only positive i can think of is that it's not 3.07

*If you have 3.73 in writing from any point during the ordering/building process, bring it with you and push for a swap prior to delivery.
03-13-2012 03:48 PM
MTH
Quote:
Originally Posted by jeepguy8888 View Post
So if I keep it like this the 3.21 will pretty much be enough for my usage?

The 3.21 is slower...however is that noticable?

I am trying to cheer myself up!
Do you think Chrysler sells jeeps that can't be used?

Of course it will be fine. I would expect most 2007-2011 JK owners with manual transmissions have 3.21s, as would most 2012 and onward owners. If you eventually upgrade to 35" tires, I think you'll wish you had gotten 3.73s, especially if you have an auto transmission. Though in any event you can always swap out gears aftermarket (approx. $1200 to $2000).

I have 3.21s in my 2010 with 33x12.5R15 tires. It's fine.
03-13-2012 03:43 PM
Casotakar1229
Quote:
Originally Posted by jeepguy8888 View Post
So if I keep it like this the 3.21 will pretty much be enough for my usage?

The 3.21 is slower...however is that noticable?

I am trying to cheer myself up!
I believe you will be very happy. it isn't slow...for a jeep. I mean, yea in general it's slow, but it picks up when you want it to. you'll be happy, relax and throw the top back. you've got a jeep!
03-13-2012 03:41 PM
jeepguy8888 So if I keep it like this the 3.21 will pretty much be enough for my usage?

The 3.21 is slower...however is that noticable?

I am trying to cheer myself up!
03-13-2012 03:41 PM
Celtic
Quote:
Originally Posted by zuber View Post
Gas mileage and the smile on your face while driving it.
And I guess you could say that fewer revolutions would amount to less wear, given equal odo readings.
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