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Old 06-16-2012, 01:28 PM   #1
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Gear ratios

As i wait impatiently to order a 2013 JKU i have a question about axle ratios.....4:10's.....3:73's......wondering how this affects highway usability and gas mileage....if you order a Rubicon with 4:10's, will you be screaming down the hiway at 4500 rpm's at 60 mph?. My thoughts are 3:73 because i tow a boat once in a while and wont do much 'rock climbing'........but for the most part im on the hiway and really dont want to see high rpm's all day. Any thoughts?

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Old 06-16-2012, 01:41 PM   #2
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good mpg's

HI, IF YOU get the 2 door wrangler i would get the 3.21 and u will get
about 20 mpg's. if u get the 4 door i would get the 3.73 and u will get about 17mpg's. if u get the 4.10 well that's another story i think u can figure it out, there have been previous posts on this..good luck,.

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Old 06-16-2012, 01:43 PM   #3
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Quote:
Originally Posted by jetporsche928
As i wait impatiently to order a 2013 JKU i have a question about axle ratios.....4:10's.....3:73's......wondering how this affects highway usability and gas mileage....if you order a Rubicon with 4:10's, will you be screaming down the hiway at 4500 rpm's at 60 mph?. My thoughts are 3:73 because i tow a boat once in a while and wont do much 'rock climbing'........but for the most part im on the hiway and really dont want to see high rpm's all day. Any thoughts?
Lol no

Put on 28"tires it would scream at 4500

Somebody will post the tire chart for the 3.6 and your tranny. Check it out.
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Old 06-16-2012, 01:44 PM   #4
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Originally Posted by kjeeper10

Lol no

Put on 28"tires it would scream at 4500

Somebody will post the tire chart for the 3.6 and your tranny. Check it out.
4.10's if your towing

And FYI 3.21's don't belong in a jeep
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Old 06-16-2012, 02:29 PM   #5
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Staying stock....3.21 will be fine
33's...get the 3.73's
35's are in your future....get the 4.10's

I got 4.10's on my rubi and with 33's I'm getting around 15-16mpg.
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Old 06-16-2012, 02:36 PM   #6
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did somebody mention a chart...
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Old 06-16-2012, 03:03 PM   #7
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I would say no to 3.21s. Emphatically. Not on a 4 door. The option is so cheap at least do 3.73s. They'll hardly affect your gas mileage and will at least give you a little room for playing later. Othwerwise forget going to bigger tires down the road.I have 3.21s and regret it. That's what happens when you don't look on the forum before you buy! (Since jeep salesman don't know or won't admit that 3.21s won't work for bigger tires.)
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Old 06-16-2012, 05:23 PM   #8
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thanks all....i can now make an informed decision.....very happy to have stumbled on this forum before buying.....in fact, i spend more time here than is probably healthy...
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Old 06-17-2012, 12:55 AM   #9
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Quote:
Originally Posted by kjeeper10 View Post

And FYI 3.21's don't belong in a jeep
I totally agree. You know it's coming don't you?
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Old 06-18-2012, 05:01 AM   #10
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Smile Trying to find the MPG sweet spot for 4.10's?

I had about an hour of interstate driving so I decided to try to find what my Rubicon's MPG sweet spot was by setting the cruse control (yup they have them even on the manuals) and then resetting the Avg Mpg and driving for about 5 miles. Indiana being maybe in the top 10 flattest parts of the world, I think it was a pretty good test. I-65 between Lafayette and 465

2DR Rubicon Manual 4.10 6th Gear

75 mph - 16ish mpg @ about 2,250 RPMS
70 mph - 19ish mpg I was mostly trying to find the best speed so I didn't test at this speed much to get a good reading.
65 mph - 22.3 mpg
55 mph - 23.2 mpg

I think the sweat spot would be somewhere between 45 and 50 mph. 45 is a bit of a hard test unless your willing to be that slow ass douche bag on some long highway. Anyways I was too busy testing the other speeds.

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