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-   -   RPM vrs. gear ratio (http://www.wranglerforum.com/f119/rpm-vrs-gear-ratio-178432.html)

Mulmur 08-05-2012 05:48 PM

RPM vrs. gear ratio
 
I'm new to forum.. many years ago I owned a Jeep CJ 7 and it was a great experience. Now contemplating a 2013 Sahara or Rubicon and was curious about the engine speed for highway travel relative to the available gear ratios.
Does anyone know the engine RPM for:
Sahara automatic and 3.73 gears (I believe the 3.21 are only for standard)
Rubicon automatic and 3.73 gears (I assume the same)
Rubicon standard and 4.10 gears

Any real world experience with the driving characteristics (differences) between the Sahara and Rubicon.. I realize the Rubicon is much more off road capable, but I'm interested in the on road differences. Where I live the off road is certainly available so I was leaning toward the Rubicon.
Thks..

Mulmur 08-06-2012 04:18 PM

Quote:

Originally Posted by Mulmur (Post 2655898)
I'm new to forum.. many years ago I owned a Jeep CJ 7 and it was a great experience. Now contemplating a 2013 Sahara or Rubicon and was curious about the engine speed for highway travel relative to the available gear ratios.
Does anyone know the engine RPM for:
Sahara automatic and 3.73 gears (I believe the 3.21 are only for standard)
Rubicon automatic and 3.73 gears (I assume the same)
Rubicon standard and 4.10 gears

Any real world experience with the driving characteristics (differences) between the Sahara and Rubicon.. I realize the Rubicon is much more off road capable, but I'm interested in the on road differences. Where I live the off road is certainly available so I was leaning toward the Rubicon.
Thks..


To clarify: Engine speed at say 110 kph ?

skrueger 08-17-2012 06:31 PM

With 3.21 at 110klh I barely hit 2000rpm just about as good as my Kia forte.
Oh ya it's a auto

JKURz Wild 08-31-2012 05:30 PM

tire size ?

this will help, but you need to know tranny codes
Gear Ratio Calculator

Mulmur 09-09-2012 08:35 PM

Thanks.. got it.. 2000 rpm at a decent highway speed is good for fuel economy.. not too great for off the line pick up.

Decided to order the Sahara with 3.21 gears.. thought the Rubicon might be a little too noisy re: tires and harder on fuel with higher gears..

Mayhemjeep 09-30-2012 08:57 AM

I have a 2008jk standard on 36 inch tires and I went with 4.88. Wanted a little more jam fr the overdrive gears. Love it


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