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Old 08-05-2012, 05:48 PM   #1
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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..

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Old 08-06-2012, 04:18 PM   #2
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Quote:
Originally Posted by Mulmur View Post
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 ?

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Old 08-17-2012, 06:31 PM   #3
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With 3.21 at 110klh I barely hit 2000rpm just about as good as my Kia forte.
Oh ya it's a auto
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Old 08-31-2012, 05:30 PM   #4
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tire size ?

this will help, but you need to know tranny codes
Gear Ratio Calculator
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Old 09-09-2012, 08:35 PM   #5
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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..
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Old 09-30-2012, 08:57 AM   #6
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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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