2012 jeep gears

jktubby said:

I am looking into getting some 35" tires on my 2012 jeep, however the gears in my jeep are 3.21. With that said i need to upgrade. I have been searching around for a while now, but can not find 4.10s. Is there a website that sells them. I did find 4.56 but not 4.10s, would i have to get the 4.1s from a dealer? i wouldnt mind gettin 4.56s tho since i might upgrade to 37s later on in the future. Any help though with finding 4.10s? thanks guys.

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SoCalDozer said:

driveoffroad.com sells the 4.10's they are more expensive than the higher ratios though.
front part# d30410rjk
rear part# d44410jk

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DA RUNT said:

This has a nice chart under the Axles, Gears & Drivetrain section that covers the 3.6 and 3.8 engines. Very useful info, but just run with what ya got and see how you like it. If you don't like it, follow this guide and make adjustments.

http://www.jk-forum.com/modified-jk...-questions-every-newbie-has-18617/#post211276

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jktubby said:

ya i been looking at that chart for quite sometime. i might just try it with the 3.21 and then i can go from there . i think my brothers has 5.38 gears, but his is a 3.8L 6 speed. so i can go from there too looking at the similar rpm at 70mph. looks like if i want the same drive as my bro i'd have to go with a 5.13. But 4.10s are still in the green and 4.56 is green close to blue so its all good which ever route i go. :rock:

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buddyhydro said:

Not to hijack the thread or take it off topic but would he be able to use 4.10 gears out of a 2012 Rubicon?

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ChrisB said:

you really can not compare the old 3.8 to the 3.6

I had 5.13s with 37's in my 3.8, I now run 4.10's in my 3.6. I'm happier with the 4.10's than i ever was with the old motor

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DA RUNT said:

If i'm not mistaken i believe the rubicon gears are thicker. I know when i look at different websites that offer gears there is always a seperate selection for rubicon specific diffs.

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buddyhydro said:

Not to hijack the thread or take it off topic but would he be able to use 4.10 gears out of a 2012 Rubicon?

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ichthus said:

Haven't tried it, but I've heard of others do exactly that. Just don't forget that you'll have to buy some 4.10's for the front

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Damtall55 said:

I have the JKU Sport Automatic with 3.73's. I was thinking about going with 35's and asked someone local for some help. He suggested that I go with 4.88 or 5.13 with my JKU Sport. Like I said, it is an automatic, with the stick shift option. I believe they call it the Auto-Stick or something like that. Reading this thread, I am wondering who is right and who is wrong. Can someone give me an honest opinion here without letting pride get involved? Thanks a lot!! :idontknow:

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