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Old 03-13-2012, 03:25 PM   #1
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Any Positives with 3.21?

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?

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Old 03-13-2012, 03:28 PM   #2
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Gas mileage and the smile on your face while driving it.

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Old 03-13-2012, 03:30 PM   #3
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No. Marginally better gas mileage, but that's it.
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Old 03-13-2012, 03:34 PM   #4
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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?
yea, I have 3.21's and all I've heard that's better is mpg by about 2 or 3 maybe. lol. have to get me some different gears this summer! you'll be fine for now, jeep is way faster than I expected and feels great.
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Old 03-13-2012, 03:35 PM   #5
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^ they nailed it.
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Old 03-13-2012, 03:41 PM   #6
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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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Old 03-13-2012, 03:41 PM   #7
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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!
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Old 03-13-2012, 03:43 PM   #8
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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!
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Old 03-13-2012, 03:48 PM   #9
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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.
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Old 03-13-2012, 03:51 PM   #10
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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.
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Old 03-13-2012, 03:59 PM   #11
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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!
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Old 03-13-2012, 03:59 PM   #12
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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
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Old 03-13-2012, 04:02 PM   #13
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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
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Old 03-13-2012, 04:02 PM   #14
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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
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Old 03-13-2012, 04:16 PM   #15
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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.
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Old 03-13-2012, 04:26 PM   #16
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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.
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Old 03-13-2012, 04:31 PM   #17
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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.
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Old 03-13-2012, 04:38 PM   #18
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Old 03-13-2012, 04:51 PM   #19
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I think that is the funniest thing I have ever read on this site. ^^^^^^^^^^^^
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Old 03-13-2012, 06:22 PM   #20
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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!
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Old 03-13-2012, 06:28 PM   #21
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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
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Old 03-13-2012, 06:45 PM   #22
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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!
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Old 03-13-2012, 07:07 PM   #23
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Old 03-13-2012, 07:49 PM   #24
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Old 03-13-2012, 07:58 PM   #25
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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
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Old 03-13-2012, 08:34 PM   #26
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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.
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Old 03-13-2012, 08:39 PM   #27
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Old 03-13-2012, 08:39 PM   #28
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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.
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Old 03-13-2012, 08:47 PM   #29
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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.
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Old 03-13-2012, 08:53 PM   #30
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I got the 2 door and Merc auto, pushes the 3.21's nicely imo.

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