JKbender

No not all Rubicons have 4.10 gears. As of 2012, you can get Rubicons with 3.73 gears.

Rule18

^....... Correct. Not sure why they did it, more choice is better?

ezav8tr

I'm scheduled to go in tomorrow and pick up a new 2012 Rubicon with a manual transmission and w/o a tow package . They told me it has 4.10 gears as the salesman checked with the service representative. The build sheet doesn't mention any gear ratios. I looked up the VIN on the Jeep site, and it was blank. How can I verify they're telling the truth? I plan to run 35's soon.

ezav8tr

Disregard. I just went to the Jeep website and tried to build a new 2012 and it would not let me select 3.73 gears with a manual transmission. Apparently the 3.73 gears option is only for an automatic. Correct me if I'm wrong.

eumel789

On the Jeep site where you looked up the VIN, there is a customer service area. Call or email them. I got an answer within two days :-)

hypeiv

you may need to go to 4.56 to regain stock pep, but you don't need it to be drivable. I have 2012 Auto 3.73 and at 70mph I am at 2100 RPM. I am getting only about 1mpg less than when I was stock. I am a little slower than when I was stock but I still get on the freeway without any trouble.

I am sure once you get your 35's you can see for yourself if regaining that loss in "pep" is wroth the gearing change. I would recommend getting the lift and wheels first then decided if the next few grand you spend should be gears or if you can live with the speed and spend that on something else.

rb1boxer_3

I have 37s on my 12 and plan on going 4.56



The black one has 3.5" the silver has 6" 36" iroks and I'm 6'

StrizzyChris

I agree with HypeIV...I think this is only proof that to have the exact same RPM's at the same speed then you would have to regear. Has nothing to do with driveability or NEEDING to have it done. They come with lower ratio's than 4.10 and drive and operate just fine.

Sandfrog

Why in the world Chrysler put 321's in a Jeep is beyond me... I just bought a 2012 and the plan all along was 35's. I could not afford a Rubicon so I has to scour the state for a Sport with 3:73s.. took a trip with my 35s. Hwy speed up to 65mph was ok but beyond that the engine had to work so much more to push itself against the wind the MPG would fall by the second. Wheeling in 4l is ok but in all reality 456s are on the short list... 3:21s were to keep the EPA happy with the total model year fuel economy. That's all there is to it

eumel789

You answered you own question...3.21s should come with a warning label that it is a little handicapped to appease the EPA!
65 mph for a Jeep is not so bad though, is it? (Jeeps used to come with a four-banger...)
And then there's always the Grand Cherokee if you spend a lot of time on the autobahn LOL