Gearing Chart for the 3.6 2012 Motor?

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Oct 28, 2011 | 06:19 AM

#11

KSRubicon

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Joined: Oct 2009

Posts: 355

Likes: 1

From: Castle Rock, CO

Quote:

Originally Posted by bgall

While off original topic, I can say that my 2012 unlimited with 4.10s, auto, and 315 Falken Wildpeaks has no problems with on road performance. The computer is still in break-in mode too. It is very street drivable. I just need to get the great pumpkin out in the dirt/mud/rocks now!

If your name is Linus I'll probably shoot coffee out of my nose.

Oct 28, 2011 | 06:20 AM

#12

KSRubicon

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Joined: Oct 2009

Posts: 355

Likes: 1

From: Castle Rock, CO

Quote:

Originally Posted by borracho

I'm pretty sure people were claiming that with the new 5spd auto and 410 gearing that it wasn't really necessary to regear for 35s....?

I would agree with this for daily driving and some offroading. Dealer equipped Rubi 5sp outfitted with 35s still moved along nicely.

Oct 28, 2011 | 06:23 AM

#13

KSRubicon

JK Enthusiast

Joined: Oct 2009

Posts: 355

Likes: 1

From: Castle Rock, CO

Quote:

Originally Posted by TeraFlex

I'm thinking 4:88's or 5:13's with my 37's.

If ANYONE has a 2012 AUTO trans with 37s and either 4.88 or 5.13 installed....pleeeeeeeze let me know what RPM its at at about 70mph. AUTO trans only please!

Oct 28, 2011 | 06:40 AM

#14

moblur

JK Newbie

Joined: Mar 2007

Posts: 85

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From: Los Angeles, CA

I have the 2012 sitting on 35's with the auto 4:10 gears and while I haven't taken it offroad yet, it has no problems on inclines and even has some ballsy acceleration. I don't see the need to regear but that's not to say I wouldn't change my mind after driving one that has been.

Oct 28, 2011 | 06:43 AM

#15

IcyFridge

JK Junkie

Joined: Nov 2009

Posts: 2,737

Likes: 1

From: Rochester, NY

I know that there are one or two people with 2012s and manuals with new gears and no problems. I think the limp mode happens to autos only.

Oct 28, 2011 | 06:51 AM

#16

KSRubicon

JK Enthusiast

Joined: Oct 2009

Posts: 355

Likes: 1

From: Castle Rock, CO

Quote:

Originally Posted by IcyFridge

I know that there are one or two people with 2012s and manuals with new gears and no problems. I think the limp mode happens to autos only.

This is correct. AEV ProCal now shipped for 2012, works great in mine.

Oct 28, 2011 | 06:54 AM

#17

azyjjk

JK Enthusiast

Joined: Oct 2007

Posts: 166

Likes: 2

From: Tucson, AZ

Quote:

Originally Posted by TeraFlex

I'm thinking 4:88's or 5:13's with my 37's.

I looked at a gearing chart and the sweet spot for 35's was 5:13's.

Oct 28, 2011 | 07:20 AM

#18

TexasTj

Thread Starter

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Joined: Mar 2007

Posts: 326

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From: Austin, Texas

Quote:

Originally Posted by azyjjk

I looked at a gearing chart and the sweet spot for 35's was 5:13's.

That is for the old motor.

Oct 28, 2011 | 07:20 AM

#19

KSRubicon

JK Enthusiast

Joined: Oct 2009

Posts: 355

Likes: 1

From: Castle Rock, CO

Quote:

Originally Posted by azyjjk

I looked at a gearing chart and the sweet spot for 35's was 5:13's.

With a 2012, that will be too much gear for a 35. The 85 more hp makes a huge difference. It'll work if you like 10mpg.

Oct 28, 2011 | 09:36 AM

#20

revvinkevin

JK Enthusiast

Joined: Apr 2009

Posts: 266

Likes: 1

From: Memphis Tenn.

I'm curious how well a '12 auto with 3.73's would work with 35's. I don't really need the added expense of buying a Rubicon just to get 4.10's. Has anyone driven a '12 auto with 3.73's and 35's????

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