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2012 JKU Auto 3.21 gears and 35s

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Old 10-29-2012, 08:11 AM
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Default 2012 JKU Auto 3.21 gears and 35s

how many people are running this setup? I'm planning on doing a 2.5-3.5" lift then adding 35s. I know regearing is ideal but I have to do mods in steps. the jku is my daily driver.

looking for some opinions from those who have experience with this setup.
Old 10-29-2012, 08:17 AM
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I'm running the same set up with a manual. It takes a little to get it started but after that its whatever. It's too fast in 4lo, other than that its live able with a manual.
Old 10-29-2012, 08:36 AM
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i think I am going that route and will regear soon after as soon as I figure out what I need
Old 10-29-2012, 09:20 AM
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I'm running in a 2012 with a 3.5 AEV lift and 35 inch trail grapplers with 3.21 gears. There is definitely a noticeable power change but it isn't as bad as my 09 stock was so I am not planning on regearing yet. I'm going to put that money instead into bumpers and some rock rails. They are more important than regearing. IMO
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Old 10-29-2012, 05:38 PM
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so it's bare able then driving
Old 10-29-2012, 09:33 PM
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Yep sure is!
Old 10-29-2012, 10:03 PM
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Yup, same setup here..... No issues.... But I do have an auto.

I will not re-gear unless I go bigger than 37's
Old 10-29-2012, 10:27 PM
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I've been running this setup in my 2012 auto for almost the past year. I used the AEV ProCal to calibrate for the larger tire and I think it runs like stock. I've never been at a loss for power.
Going up a steep grade, it Will occasionally be searching for the next gear in the higher rpms, but nothing major.
Old 10-30-2012, 09:04 AM
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appreciate all the help. now I just need to pick my lift kit, then save for the tires.
Old 10-30-2012, 09:26 AM
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Originally Posted by FlameRedJK
I've been running this setup in my 2012 auto for almost the past year. I used the AEV ProCal to calibrate for the larger tire and I think it runs like stock..
would that ProCal help in any way on my manual ? My clutch is a PITA in traffic.. I find that my friction point is way to far and I have to slip the clutch. Forget a second gear start, it's stalls...

What about that little gizmo you connect to the behind gas pedal(don't remember the name of that gadget). Suppose to help throttle response.. Any opinion on that out there ??


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