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Unread 05-22-2012, 09:06 PM   #1
caiha
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Gears

Have 09 wrangler unlimited x. I put 2inch lift and 33 tires on and on the hwy it sucks gas and rpm is between 3000-3500. What gears should I install to correct this problem. Not sure what's in there now. Maybe 323

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Unread 05-22-2012, 10:33 PM   #2
scubamc
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Is it an automatic or standard?
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Unread 05-23-2012, 08:33 AM   #3
caiha
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Quote:
Originally Posted by scubamc
Is it an automatic or standard?
Automatic
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Unread 05-23-2012, 09:03 AM   #4
Jason
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You should shift out of second gear.
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Unread 05-23-2012, 03:07 PM   #5
caiha
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Quote:
Originally Posted by Jason
You should shift out of second gear.
It's automatic dude
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Unread 05-23-2012, 03:52 PM   #6
Jason
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Originally Posted by caiha View Post
It's automatic dude
There's no way in hell you're turning 3000-3500 RPM at highway speed with 31s and 3.23 axle ratio. Unless you're in second gear. Or your highway's speed limit is 150 MPH.

Dude.
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Unread 05-23-2012, 09:48 PM   #7
02crewcab
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he running 33's man, not 31's
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Unread 05-24-2012, 05:56 AM   #8
Jason
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Originally Posted by 02crewcab View Post
he running 33's man, not 31's
Even better. There's still no way in hell he's turning that many RPM with a normally functioning transmission.
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Unread 05-24-2012, 11:03 AM   #9
Wheelin98TJ
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Quote:
Originally Posted by 02crewcab View Post
he running 33's man, not 31's
And what do bigger tires do to your RPM?
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Unread 05-24-2012, 11:09 AM   #10
Wheelin98TJ
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Quote:
Originally Posted by caiha View Post
Have 09 wrangler unlimited x. I put 2inch lift and 33 tires on and on the hwy it sucks gas and rpm is between 3000-3500. What gears should I install to correct this problem. Not sure what's in there now. Maybe 323
Your auto trans has a 0.69 overdrive ratio.

If you have the deepest factory ratio available for a JK (4.10), you would be doing 100 MPH at 3k RPM and 115 MPH at 3,500 RPM.

Something is not adding up.
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Unread 05-24-2012, 11:59 AM   #11
edpmedic
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http://www.onlineconversion.com/bigger_tires.htm

At the bottom calculation you can figure out the conversion for metric tires to inches



http://pitbulltires.com/calculate.php
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