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Topic Review (Newest First)
08-19-2012 10:32 PM
JK12FL
Quote:
Originally Posted by ekbergman
3.73 JKU 6spd manual guys, what is your mileage like????
I get 18.5 average in city/countryside, 22 hwy. Still have stock tires on. Just installed ARB front and rear bumpers, rock sliders and winch this week so we'll see how the ~250 lbs affect it. But to be honest I couldn't really care less if I got 17 or 18.5 mpg. With my average of 10000 miles a year it would make up for a difference of roughly $200 a year. I would say that's worth it for some useful accessories!
08-19-2012 10:14 PM
Blackpony04 Installed my 285s on Friday (which are more like 32s) and the only difference I noticed in my 3.21 geared Jeep is that it doesn't coast in idle as quickly (meaning letting off the brake the Jeep doesn't start forward as fast). Otherwise it still has the same balls it had on the stock baby steelies. That being said I'd still order 3.73s given the opportunity just to have more pickup off the line.
08-19-2012 01:02 PM
JeepHerz
Quote:
Originally Posted by TopTomato View Post
Im about to order a 13' JK Auto, and i'm contemplating getting the 3.73 over the 3.21. However I really do not plan on adding a lift kit or over sized tires to my jeep. I do live in NJ so not too many hills, however the only reason why I was thinking this is because sometimes we do get a considerable amount of snow, and I work in the emergency room. So with that being said, even in a state of emergency it is still my duty to go into work no matter how bad the road conditions are. This is one of the reasons why I was contemplating getting the 3.73 gears. Also if I went with the 3.73 gears I understand that my gas mileage would be a little worse, however would it even be noticeable? On the Jeep website they have the rubicon listed at 17/21 MPG along with the Sport S however the rubicon has 4.10 gears in it. So how noticeable would my gas mileage be?
Your gas mileage could be anywhere regardless of what gearing- there are so many factors involved. Tires, how you drive, weight etc. If you get 3.21s but mash the gas to eek out any speed you may have.....there goes your gas mileage. The difference could be nothing.....or maybe 2 mpg? At least drive different-geared Jeeps back to back. Then decide how important that mpg is- and do the math. 15k a year at 18 mpg vs 15k @ 16....@ $4 a gallon. $36 a month. And that's just an estimate again because of all the factors that affect mpg.
A friend of mine traded in a car for a new one just because of the "rated" mpg on the sticker- and she lost money on the trade. And now she is upset because shockingly she isn't getting the mpg on the window sticker. So she lost money on the trade AND she isnt saving that much money on gas. Don't let mpg give you tunnel vision.
08-19-2012 12:54 PM
watson
Quote:
Originally Posted by ekbergman
3.73 JKU 6spd manual guys, what is your mileage like????
I average about 19.8 with 22 mpg being my best tank
08-19-2012 12:27 PM
VancouverJeep
Quote:
Originally Posted by JeepHerz View Post
X2! Thank you for expressing what's also drives me CRAZY. Stupid thing upshifts to 4th right at 38 mph and the RPMs positvely tank. I go from "lively" to "what the heck just happened!". On the freeway its just fine- but city driving feels like a tank.
For those that think buyers are "just clueless" for buying the 3.21s- aren't you just special and omniscient. EVERY salesman I spoke to heard the same spiel from me- "I will be upgrading the wheels & tires"- and not one mentioned the gearing. Little did I know they'd sell a Jeep with a gear ratio only intended for stock skinnies. They all sold 3.73s as "only needed for towing". I figured the 80 extra HP and 5 speed tranny were all I needed. I researched my lift and tires out the wazoo before I bought. Forgive me for not stumbling onto the Jeep Gear chart or for not having Googled "Are stock 3.21 gears a problem on a 2012 Jeep" in advance of my purchase. Shame on me for not remembering the gear ratio on my TJ from 1998. Jeep shouldn't be selling these with 3.21s to start, their salespeople should know the difference, and the 24S package should automatically bump you into 3.73s. The highly modifiable/very often modified Jeep should be the last vehicle you should be worried about in terms of gearing and/or tire changes. Someone else has said it- and I don't mean to insult all the 3.21s owners out there (myself included)- 3.21s shouldn't be stock on a Jeep to begin with. And you shouldn't have to sign onto a Jeep forum to know it.
(No, I am not bitter.)
Right on! I am one of those "clueless" guys that ended up with the 3.21 and having a bad case of regrets. Especially as I almost bought one from another dealer with the Max Tow group and the 3.73. And it is purely ego driven and the comments on these forums about being clueless, stupid, and having a gutless 3.21 that is making me feel this way. Grateful for the other comments from those a lot more knowegeable than me reassuring that the 3.21 will suit me fine for my lifestyle and use of my Jeep. It's my first one and I love it and don't want to have any regrets.
I am pissed at the salesman though and intend to give the dealership a hard time and ask that they consider a really smoking deal on regearing in the future. I think they will. I did get this one almost $2K less than the one with the 3.73 that I was looking at, so I will likely regear in the future when I need now tires.
But I love my new Jeep. It as an impulse buy (hence the lack of homework) but it was that same implulse that got me into rather than a Ford Escape.
I am so happy my Jeep! So thanks again to this forum for alleviating my post "did I make a big mistake for getting a 3.21" blues.
08-18-2012 07:37 PM
ekbergman Most people w rubicons are reporting 17 hwy. if you aren't going to lift w big tires and offroad a lot then just go w a 3.21, you will save a bundle on fuel costs and will be fine in the winter snow. I offroad a few times a year, tow, and live in a snow region and am ordering a JKU 3.21.
08-18-2012 02:36 PM
TopTomato Im about to order a 13' JK Auto, and i'm contemplating getting the 3.73 over the 3.21. However I really do not plan on adding a lift kit or over sized tires to my jeep. I do live in NJ so not too many hills, however the only reason why I was thinking this is because sometimes we do get a considerable amount of snow, and I work in the emergency room. So with that being said, even in a state of emergency it is still my duty to go into work no matter how bad the road conditions are. This is one of the reasons why I was contemplating getting the 3.73 gears. Also if I went with the 3.73 gears I understand that my gas mileage would be a little worse, however would it even be noticeable? On the Jeep website they have the rubicon listed at 17/21 MPG along with the Sport S however the rubicon has 4.10 gears in it. So how noticeable would my gas mileage be?
08-12-2012 08:39 PM
ekbergman 3.73 JKU 6spd manual guys, what is your mileage like????
08-02-2012 06:01 PM
WXman Sometimes I feel like 1st gear is too short, and 6th gear still isn't enough overdrive for 70 MPH travel. Other times I'm glad to have the extra gearing with running the A/C around town (the A/C KILLS the power on these engines for some reason...like, more noticeably than any other vehicle I've owned). It really just depends on the day and where I am going.

But I do think that with 3.21s you would end up staying in 1 - 4 most of the time and you really won't be using the trans. at it's full potential.

I definitely would NOT want 4.11s unless I knew for a fact that I was going to run large tires. I've had 4.11s to 4.88s in other 4x4s and it was a good match...for for the '12 6-speed it would be overkill.

If Jeep still offered a 3.55 it would be the perfect gear for a DD with <=33" tires.
08-02-2012 05:24 PM
panthermark
Quote:
Originally Posted by JeepHerz View Post
??? Someone at Chrysler doesn't know they sold 2012 auto's with 3.21s? Fantastic! I'll take mine back and tell them I shouldn't have 3.21s. They can put in 3.73s!
Dude....I was so pissed when I got that response. I had a thread about it a while ago.

Yeah....I tried to explain to the customer service rep that it looks like the 2012 OM still had the towing chart from the 2011 OM....and I was basically told that since 3.21's with an auto are not on the chart, they are not available for the 2012's.
08-02-2012 05:17 PM
JeepHerz
Quote:
Originally Posted by panthermark View Post
The owner's manual is incorrect. It is still set up for the 2011's. (Notice the lack of 3.21's for an auto which were not available in 2011).

http://www.jeeppr.com/jeep/pdf/2012_...gler_Specs.pdf

If you pull the 2011 owners manual, you will see the same chart that you posted. I emailed Jeep and tried to tell them about the error. The response I got was that 3.21's are not available on 2012's with autos.

??? Someone at Chrysler doesn't know they sold 2012 auto's with 3.21s? Fantastic! I'll take mine back and tell them I shouldn't have 3.21s. They can put in 3.73s!
08-02-2012 03:53 PM
wickedsprint Good find!

I'm glad for the 3.21 owners who are now legal...but still glad I went with 3.73

Thanks for the link!
08-02-2012 03:16 PM
panthermark
Quote:
Originally Posted by wickedsprint View Post
Not according to page 73 of the owner's manual.
Quote:
Originally Posted by wickedsprint View Post
2012 Tow chart
The owner's manual is incorrect. It is still set up for the 2011's. (Notice the lack of 3.21's for an auto which were not available in 2011).

http://www.jeeppr.com/jeep/pdf/2012_...gler_Specs.pdf

If you pull the 2011 owners manual, you will see the same chart that you posted. I emailed Jeep and tried to tell them about the error. The response I got was that 3.21's are not available on 2012's with autos.
08-02-2012 03:08 PM
JeepHerz Ouch. More bad news on the 3.21s.
Gotta stop looking at this stuff.
08-02-2012 02:54 PM
wickedsprint 2012 Tow chart
08-02-2012 02:09 PM
wickedsprint
Quote:
Originally Posted by panthermark View Post
On the 2012's and above, all 2-doors have a 2000 pound tow rating, regardless of tranny or axle ratio.
Not according to page 73 of the owner's manual.
08-02-2012 01:34 PM
panthermark
Quote:
Originally Posted by wickedsprint View Post
I wanted 3.73s mainly because it doubles the tow rating to 2000lbs on the 2 door model.

After buying it, I'm glad I went 3.73s. Stop and go is so much easier..you can just about pop the clutch at idle in 1st and not stall it.

Freeway isn't too bad at 70..around 2500rpm I believe..but I have the smaller 16" wheel/tire combo.
On the 2012's and above, all 2-doors have a 2000 pound tow rating, regardless of tranny or axle ratio.
08-02-2012 01:09 PM
RayJK14 3.73's are the best decision i didn't know i made !
08-02-2012 12:12 PM
EricM
Quote:
Originally Posted by wickedsprint
I wanted 3.73s mainly because it doubles the tow rating to 2000lbs on the 2 door model.

After buying it, I'm glad I went 3.73s. Stop and go is so much easier..you can just about pop the clutch at idle in 1st and not stall it.

Freeway isn't too bad at 70..around 2500rpm I believe..but I have the smaller 16" wheel/tire combo.
Exactly why I ordered 3.73s on my 6 speed manual. I test drove both 3.21 and 3.73 and thought the 3.73 was much easier to drive. The 3.21 almost turned me off to even getting a Jeep until I tried the 3.73.
08-02-2012 11:58 AM
wickedsprint I wanted 3.73s mainly because it doubles the tow rating to 2000lbs on the 2 door model.

After buying it, I'm glad I went 3.73s. Stop and go is so much easier..you can just about pop the clutch at idle in 1st and not stall it.

Freeway isn't too bad at 70..around 2500rpm I believe..but I have the smaller 16" wheel/tire combo.
07-18-2012 08:59 PM
ekbergman Great thread guys, has helped a lot. I plan on building a JKU with a manual and hard top, but was torn between 3.21 and 3.73 gear ratio. I've been driving lifted jeeps for many years, but this JKU is going to be my dd and family vehicle, so I don't plan on running big tires or a lift, and minimal offroading. I've decided to stick with the 3.21 to optimize fuel economy.
06-20-2012 04:52 PM
Nobozos84
Quote:
Originally Posted by Nobozos84 View Post
What ratio would YOU ( " YOU " being the resident expert ) suggest on a 2012 Sport 2 door, 6 speed, 33"s, daily driver, town and hwy, no towing, counting on somewhat decent mileage.
It's a 6 speed MANUAL !!
06-20-2012 04:51 PM
panthermark
Quote:
Originally Posted by Nobozos84 View Post
What ratio would YOU ( " YOU " being the resident expert ) suggest on a 2012 Sport 2 door, 6 speed, 33"s, daily driver, town and hwy, no towing, counting on somewhat decent mileage.

3.73's on everything except 2012/13 2-door autos that will be stay stock, and be used for simple commuting and very light wheeling.
06-20-2012 04:49 PM
JKWrangler2012 ohh... folks... ALWAYS go with the manual!!!
06-20-2012 04:48 PM
Nobozos84 What ratio would YOU ( " YOU " being the resident expert ) suggest on a 2012 Sport 2 door, 6 speed, 33"s, daily driver, town and hwy, no towing, counting on somewhat decent mileage.
06-20-2012 04:43 PM
JKWrangler2012 i was a brain dead bone head when i ORDERED... gearing and differentials weren't even in my thoughts. regrettably, my first OlllllllO

everything she does though, she does well... but i know i'm missing out sans 3.73's and LSD. it's hilly here. right foot heavy.

i've long decided on 4:10's and ETT-LSD... but... i think if i'm going that far... i might as well just put on 4:10's with eaton lockers. -think the Dana 30 can handle it? i will certainly be off road, but no plans to scale the lion's back @ moab anytime soon.
06-20-2012 03:48 PM
JeepHerz
Quote:
Originally Posted by theotis View Post
The biggest issue is the Automatic's insistence that you cruise at under 1500 rpm. When I am on a 50 mph country road go up and down small hills, the Auto often likes to choose 5th. Same type of thing happens around town with 4th gear. Unless I am going on the Interstate, I limit it to 4th gear and sometimes 3rd. Off the line isn't an issue, nor is cruising at 70. I actually am happy with a 3.21 when cruising at 70. I understand trying to get the most mpg out of this brick, but I really wish there was a power setting for the automatic or a way to reprogram it to be more aggressive. I really don't think I need or want to regear, I just need a more aggressive automatic.
X2! Thank you for expressing what's also drives me CRAZY. Stupid thing upshifts to 4th right at 38 mph and the RPMs positvely tank. I go from "lively" to "what the heck just happened!". On the freeway its just fine- but city driving feels like a tank.
For those that think buyers are "just clueless" for buying the 3.21s- aren't you just special and omniscient. EVERY salesman I spoke to heard the same spiel from me- "I will be upgrading the wheels & tires"- and not one mentioned the gearing. Little did I know they'd sell a Jeep with a gear ratio only intended for stock skinnies. They all sold 3.73s as "only needed for towing". I figured the 80 extra HP and 5 speed tranny were all I needed. I researched my lift and tires out the wazoo before I bought. Forgive me for not stumbling onto the Jeep Gear chart or for not having Googled "Are stock 3.21 gears a problem on a 2012 Jeep" in advance of my purchase. Shame on me for not remembering the gear ratio on my TJ from 1998. Jeep shouldn't be selling these with 3.21s to start, their salespeople should know the difference, and the 24S package should automatically bump you into 3.73s. The highly modifiable/very often modified Jeep should be the last vehicle you should be worried about in terms of gearing and/or tire changes. Someone else has said it- and I don't mean to insult all the 3.21s owners out there (myself included)- 3.21s shouldn't be stock on a Jeep to begin with. And you shouldn't have to sign onto a Jeep forum to know it.
(No, I am not bitter.)
06-20-2012 01:36 PM
NFRs2000NYC
Quote:
Originally Posted by theotis View Post
The biggest issue is the Automatic's insistence that you cruise at under 1500 rpm. When I am on a 50 mph country road go up and down small hills, the Auto often likes to choose 5th. Same type of thing happens around town with 4th gear. Unless I am going on the Interstate, I limit it to 4th gear and sometimes 3rd. Off the line isn't an issue, nor is cruising at 70. I actually am happy with a 3.21 when cruising at 70. I understand trying to get the most mpg out of this brick, but I really wish there was a power setting for the automatic or a way to reprogram it to be more aggressive. I really don't think I need or want to regear, I just need a more aggressive automatic.
Agreed. The transmission on most modern cars are programmed to cruise as low as possible. This is stupid, and I wish there was a way to reprogram the shift points in the JK without affecting the other systems like speedo, etc.
06-20-2012 11:04 AM
MikeK46 My main issue with the 3.21s is probably the shift from 1st to 2nd, which drops me WAY under the powerband. Unless I mash the gas, acceleration stops after the shift to 2nd. I understand the idea is to save gas, but it's pretty ridiculous.
06-20-2012 10:43 AM
Ottis Just bought a 2012 Sport after first test driving a white 3.73 and then a dark cherry 3.21, both auto trans. With four of us in the car (two adults, two kids) I noticed slightly more power from a standing stop with the 3.73 when I went up a relatively steep, paved incline on the test drive. Other than the initial acceleration, didn't feel a lot of difference. Went back and forth on which one to buy, but in the end I really wanted the dark cherry and it came with hard top vs. soft top for the white (we live in Denver, so I am guessing I will like the hard top come winter). The white also had hail damage, and while the dealer would give us $500 off for it I hated starting a new Jeep relationship with baggage ...

Will take it into the mountains this weekend (roads) to see how the power flies there. So far we are getting 17.5 mpg on a lot of short (3-5 miles) trips around town. Pretty pleased with that.
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