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View Full Version : Question about 2012 JK front and rear differentials.



Beau beau
05-22-2012, 10:21 PM
I have a 2 door sport and the window sticker says it came with 3.21 gears. I am running 35" toyos and was wondering about regearing the front and rear. I was told that any JK with 3.21 gears would have to replace the entire carrier unit to install lower gears such as 4.10's or 4.88's because the carrier was smaller. I guess my question is was this correct. I feel like I don't need much lower gears because the 2012 has a little spunk to begin with, but I would like to increase my fuel milage a little because I do drive my JK every day to work about 40 mile round trip. Thanks

wayoflife
05-22-2012, 10:27 PM
I have a 2 door sport and the window sticker says it came with 3.21 gears. I am running 35" toyos and was wondering about regearing the front and rear. I was told that any JK with 3.21 gears would have to replace the entire carrier unit to install lower gears such as 4.10's or 4.88's because the carrier was smaller. I guess my question is was this correct. I feel like I don't need much lower gears because the 2012 has a little spunk to begin with, but I would like to increase my fuel milage a little because I do drive my JK every day to work about 40 mile round trip. Thanks

what you heard is true. in order to run a higher ratio, you will need to get a new set of carriers or lockers. sorry.

Beau beau
05-22-2012, 10:34 PM
what you heard is true. in order to run a higher ratio, you will need to get a new set of carriers or lockers. sorry.

Thanks I was affraid of that. Is the same true with the unlimited JK.

wayoflife
05-22-2012, 10:36 PM
Thanks I was affraid of that. Is the same true with the unlimited JK.

has nothing to do with your jk being a 2-door so yes, the same would hold true with the 4-door. it's about the carrier that you have installed in the axle.

Tim
05-23-2012, 01:41 AM
on a good note, new carriers are only about 60-70 bucks.

Beau beau
05-23-2012, 06:35 PM
on a good note, new carriers are only about 60-70 bucks.

Where can i find them for that price and what are they listed to fit. Are the carriers aftermarket or oem.

Tim
05-24-2012, 02:25 AM
Where can i find them for that price and what are they listed to fit. Are the carriers aftermarket or oem.

the one I found was from Yukon. I'm sure there are other company's that make them. Not sure the years for this one, just did a quick search for carriers, since I can't remember where I first saw them when I was thinking of re-gearing.

http://northridge4x4.com/shop/yukon-standard-open-carrier-case-dana-30-3-73-up-yc-d706008