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post #1 of 11 Old 11-25-2013, 10:02 AM Thread Starter
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Re-Gear Question

Newbie here
2010 Jk 2Dr 6spd manual 3.73 gears 2.5" Rc lift
285/70R-17 Hankook Dynatrac MT (Measure 32.5")

When I went from stock tire to current tires I lost 3 mpg.
I have been told that re-gearing will get me some of the lost mpg's back.
This is my DD so I do not want to re-gear too low.
Gear chart says for this size tire 4.1's are what I need but 4.56's are cheaper.
Question: Would 4.56 gears be too low?
I am adding an ARB locker to the rear so if I should re-gear I want to do it at the same time. I have NO plans on increasing tire size.

Thanks
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post #2 of 11 Old 11-25-2013, 11:54 AM
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For a daily driver with lots of highway use, yes. Driven in town or in the hills 4.56 would be acceptable.

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Last edited by thedirtman; 11-25-2013 at 11:57 AM.
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post #3 of 11 Old 11-25-2013, 12:07 PM
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First off, when you changed your tire size, did you reprogram the computer to tell it about the change? If not, your MPG calculation is going to be off.

Stepping up to that tire size you really don't need to regear. I have a 2012 with the 6 speed and 315/70R17 (35") tires and 4.56's and that's probably at the top end of where I'd want the gears for a daily driver. I'm planning on going to 37's eventually and the 4.56 will be good for me.

The 3.73 should be fine on a daily driver for a 33" tall tire like the ones you have, once you reprogram the computer to give you an accurate MPG calculation.


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post #4 of 11 Old 11-25-2013, 12:42 PM Thread Starter
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Quote:
Originally Posted by grimmjeeper View Post
First off, when you changed your tire size, did you reprogram the computer to tell it about the change? If not, your MPG calculation is going to be off.

Stepping up to that tire size you really don't need to regear. I have a 2012 with the 6 speed and 315/70R17 (35") tires and 4.56's and that's probably at the top end of where I'd want the gears for a daily driver. I'm planning on going to 37's eventually and the 4.56 will be good for me.

The 3.73 should be fine on a daily driver for a 33" tall tire like the ones you have, once you reprogram the computer to give you an accurate MPG calculation.
Yes I had the speedo re-calibrated.
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post #5 of 11 Old 11-25-2013, 02:19 PM
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Quote:
Originally Posted by grimmjeeper View Post
First off, when you changed your tire size, did you reprogram the computer to tell it about the change? If not, your MPG calculation is going to be off.

Stepping up to that tire size you really don't need to regear. I have a 2012 with the 6 speed and 315/70R17 (35") tires and 4.56's and that's probably at the top end of where I'd want the gears for a daily driver. I'm planning on going to 37's eventually and the 4.56 will be good for me.

The 3.73 should be fine on a daily driver for a 33" tall tire like the ones you have, once you reprogram the computer to give you an accurate MPG calculation.
Keep in mind the OP has a 2010 and not the Pentastar. I ran 5.13's with 33's on my 2011 JK forever before going to 35's. 5.13 was optimal with 33's IMO.
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post #6 of 11 Old 11-25-2013, 02:28 PM
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Quote:
Originally Posted by ShaunWV View Post
Keep in mind the OP has a 2010 and not the Pentastar. I ran 5.13's with 33's on my 2011 JK forever before going to 35's. 5.13 was optimal with 33's IMO.
Jeez, 5.13 with 33's

4.56 will be good for 33's. That's it, however. I find 4.88 good up to 35's with a manual and 5.13 w/ 35's for an auto.

You won't find 4.10 so 4.56 will be your next choice.

-Dan

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post #7 of 11 Old 11-25-2013, 02:31 PM
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Should have mentioned I have an auto. I would seriously think about 5.38's for my 35's, and would most certainly recommend them for 37's. Of course, this is with 3.8L and Auto tranny. If you have a 3.8 and an auto, I promise you you will have wished you went with a higher gear than a 4.56.
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post #8 of 11 Old 11-25-2013, 05:15 PM
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The op has a 6 speed, it is listed right in the first post.

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post #9 of 11 Old 11-25-2013, 05:43 PM Thread Starter
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Thanks for the input.
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post #10 of 11 Old 11-25-2013, 05:47 PM
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Quote:
Originally Posted by ShaunWV View Post
Keep in mind the OP has a 2010 and not the Pentastar. I ran 5.13's with 33's on my 2011 JK forever before going to 35's. 5.13 was optimal with 33's IMO.
Good point. That would also account for the drop in MPGs even with a calibrated speedo.


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post #11 of 11 Old 11-25-2013, 05:56 PM
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Quote:
Originally Posted by thedirtman View Post
The op has a 6 speed, it is listed right in the first post.
Fully aware. Posting for informational purposes.


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