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3.21 gears

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Old 06-27-2010, 03:06 PM
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Default 3.21 gears

Quick Background:
I recently bought a Rubicon Unlimited.... I love it and the wife loves it. She has a Jeep Patriot and we use it as a road trip car (about 26-30mpg's). However, she wants a 2 door JK now.

Question:
Will the 3.21 transmission run okay and still get good mpg's with my Rubicon take-offs, 32'' BGF Mud-terrains? Her JK will be a pavement princess, vary rarely takin off-road and covered in her favorite stuff CHROME.
Old 06-27-2010, 03:13 PM
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well it depends, manual or auto? manual you are going to be able to shift when needed, so its alot easier to deal with than an auto with 3.21... I have 4.10 on my 2 door with 33 inch tires, and I feel the rpms and power are just right. Look for an 07 that came with 4.10. i belive they stoped making 4.10 in non rubi jk's in 08.

But then again if its only going to be a princess jk then she might be fine with the rubi 32" tires and 3.21 gears.
Old 06-27-2010, 03:14 PM
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Originally Posted by GaMtnJk
Quick Background:
I recently bought a Rubicon Unlimited.... I love it and the wife loves it. She has a Jeep Patriot and we use it as a road trip car (about 26-30mpg's). However, she wants a 2 door JK now.

Question:
Will the 3.21 transmission run okay and still get good mpg's with my Rubicon take-offs, 32'' BGF Mud-terrains? Her JK will be a pavement princess, vary rarely takin off-road and covered in her favorite stuff CHROME.
I'm sorry, but you planning on getting the auto or manual?

I got rubicon take-offs on my 2 door sport auto 2010 JK and I get pretty bad gas mileage. 13.5 and im about 90% +- 5% City and about 10%freeway.

PS: try and get a good deal on a 2010 because 2011 are worse
Old 06-27-2010, 03:15 PM
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my jeep when i bought it was an X with S-package. 3.21 on stock wheels (not the steels, the 17's) and i ran awesome. 6speed manual got about 20 city/ 24-26 hwy you be fine
Old 06-27-2010, 03:16 PM
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you have an automatic, so the 3.21 will not be great. they dont even sell auto's with 3.21 gears anymore. A/T bumps it to 3.73.

32" is a stock tire tho, so you'd be fine really. just wouldnt be the fastest thing in the world..
Old 06-27-2010, 04:11 PM
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After some more research, and a few post, I see that Jeep no longer produces an auto 3.21. She will insist on an auto, so I guess its 3.73 for her. Thanks for the replys!
Old 06-28-2010, 03:30 AM
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3.21's are available on 6-speed "Sport" and "Sahara" models. It will be fine with 32" tires.
Old 06-28-2010, 04:16 AM
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With the 32" mud t/a's you will be fine. I put those tires on my son's X w/auto. He does complain a bit about gas mileage but that is because his last vehicle was a Civic. Besides ... I am the one paying for his gas.



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