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Old 12-26-2012, 09:22 AM   #1
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2012/13 Auto with 35" and 4.10 gears

Anyone running this combo? How's the highway driving? A lot of 5-4-5-4 shifting in the Auto tranny? Thinking of regearing to 4.10 or 4.56. I'm running 35" with 3.73 now and my tranny shifts into 4th a lot on the highway, especially on the hills.
Thanks.

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Old 12-26-2012, 09:45 AM   #2
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There are a ton of threads on this issue. Lots of opinions on gear ratios verses tire size. Remember the 3.6VVT is a nice upgrade but it is still a V6 and 35" tires have a lot of rolling resistance. Re - gearing will help at a significant cost.

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Old 12-26-2012, 09:51 AM   #3
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Did you already do the AEV ProCal thingy?
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Old 12-26-2012, 09:52 AM   #4
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Yes, I have the Procal and have set the JK for 35" tires, well 34.6" as measured correctly.

Quote:
Originally Posted by scubatech View Post
There are a ton of threads on this issue. Lots of opinions on gear ratios verses tire size. Remember the 3.6VVT is a nice upgrade but it is still a V6 and 35" tires have a lot of rolling resistance. Re - gearing will help at a significant cost.
Agreed about the V6. (Oh how I'd love a Hemi conversion!)
I'm looking for experience, not opinions on this gearing and tire size.
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Old 12-26-2012, 08:18 PM   #5
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4.10 works good but if going through the trouble and expense of re-gearing, go with 4.56.
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Old 12-27-2012, 06:58 AM   #6
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Read up on gear choices for auto's and the penstar motor. I don't have the penstar have that enimic mini-van motor so when the gear change occurs, it will be 5.38s but don't think you can put those in Dana 30's.

Currently have the stock 4.10's, this thing is dawg IMO, especially whenever a hill is involved. Kinda sad when you are in the semi lane going up hill and then one passes you.
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Old 12-27-2012, 11:29 AM   #7
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I have that combo with my 2012 JK. We just finished an LA to Phoenix round trip and love the combo. There was some highway downshift to 4th gear but not excessive (about the same as our previous Honda CR-V), and not anymore than the Sahara I drove for about two weeks this summer with 3.21s and stock tires. I'm told our effective gear ratio with this combo is about 3.45, with my BF Goodrich All Terrains we cruise at about 2300 - 2400 ant 70 mph. Thats as high as I want. Lower gears would help eliminate some of the downshifting at the expense of always working the engine at a higher rpm.

Having said all this, we live in So Cal, do a lot of highway driving, do a lot of desert exploration, and not much rock crawling. 3.73s are good for us but it is a very personal thing. I did notice the big LT 35s dropped the gas mileage at least 2 mpg and the acceleration is less.
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Old 12-27-2012, 12:42 PM   #8
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Quote:
Originally Posted by RUBI13 View Post
Anyone running this combo? How's the highway driving? A lot of 5-4-5-4 shifting in the Auto tranny? Thinking of regearing to 4.10 or 4.56. I'm running 35" with 3.73 now and my tranny shifts into 4th a lot on the highway, especially on the hills.
Thanks.
check this thread on this forum Anyone with 2012 JK, lift & 35" tires?
It has some good info on this subject.
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Old 12-27-2012, 01:11 PM   #9
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I'd like lower than 4.10, but I can live w/it. I think the ability to adjust shift points would make a huge difference, if we ever get a tuner.
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Old 12-27-2012, 04:44 PM   #10
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2012 auto, 4:10's with 3.25 lift and 35's & procal. I think it works great on the street. Havent wheeled it yet but around town and the hwy it works just fine. No complaints.

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