I have a 2012 JK Unlimited Rubicon Auto with 3.73 gears

I am planning on running 35" tires. I am thinking about going with 4.88. It would be silly to just go to 4.10. can't go with 4.56 so 4.88 is the one that makes sense. I do plan on rock crawling.

I have an awesome master gear installer.

What I need to do is figure out which Brand Gears I am going to go with. Also With the 2012 don't I need a chip to prevent "Limp Mode". Who has "cracked" the code and which "chip" is the best to go with.

Also with the 2012 auto do you think 4.88 gears and 35" tires will be good for rock crawling, towing and optimal performance?

Other than gears and the chip is there anything else I need to consider.

Thanks

Also Open to any offers on both Gears and Chip.

 

^^^^ Why can't you go with 4.56? That is what I put in mine and I am running 35's and love it! Perfect set up for an auto 2012 if you ask me. Also, you don't need a "chip" jus get a Procal from AEV and you will be set.

 

im going to be lifting and putting 35"s on in a week and strongly considering going with 4.56 gears.

 

My 2012 with 4.10, 35s and auto work great! AEV procal should work, can't remember all gear ratios it covers but there are quite a few. Sorry for short reply...on plane landing.

 

Some how I got the idea in my head that 4.56 gears were difficult if not impossible to get.

I forgot to mention the following.

I live in the mountains of pennsylvania, drive highway about 55 miles a day at 75-80mph, tow a trailer with two snowmobiles or ***********s and rock crawl.

Plus besides finding the right gear set and manufacture is the only other thing I need is AEV's ProCal?

 

Yea ave is the only program out for the 2012 and 488 will b perfect I have 6 speed with 516 and works awesome for me.

 

Sorry( AEV )IS THE ONLY ONE

 

I'm running 4.10s and 35s on a '12 JKUR auto. The Procal helped a ton and honestly wouldn't want much more gear in a daily driver. I think 4.88 would be too much for a rig that was going to see much highway time. You would be turning nearly 3000 rpm @ 70mph which would be good for all of about 12 mpg

 

So with the 3.6 motor and new trannie the 4.10's sound like the ideal gear 35" tires. Since I live in hilly, mountainous state and rock crawl, tow and do about 55 miles of 75mph daily driving I am wondering if instead of going from 3.73's to 4.10's if I could find a sweet spot with 4.56 gears.
I am thinking 4.10's is right, but to go from 4.10's from 3.73's (when it could have been ordered that way for $50) seems like a waste.
I am trying to see if I can justify 4.56 gears or if I am going to be higher than 2500 rpm at 70mph

Would people with a 2012 Auto and 35" tires please answer the following questions.


1) Who has 4.10 gears and a 2012 auto with 35" tires
A) Do you drive highway as a Daily Driver if so what rpm are you at 70 mph
B) Do you live in a flat or hilly/mountainous state?
C) Do you tow
D) Does your vehicle have significant weight (such as Aftermarket Front, Rear Bumpers, Winch, Skid protection etc)
E) Do you Rock Crawl

2) Who has 4.56 gears and a 2012 Auto with 35" tires.
A) Do you drive highway as a Daily Driver if so what RPM are you at 70 mph.
B) Do you live in a flat or hilly/mountainous state?
C) Do you tow
D) Does your vehicle have significant weight (such as Aftermarket Front, Rear Bumpers, Winch, Skid protection etc)
E) Do you Rock Crawl

3) Who has 4.88 gears and a 2012 Auto with 35" tires.
A) Do you drive highway as a Daily Driver if so what RPM are you at 70 mph.
B) Do you live in a flat or hilly/mountainous state?
C) Do you tow
D) Does your vehicle have significant weight (such as Aftermarket Front, Rear Bumpers, Winch, Skid protection etc)
E) Do you Rock Crawl

 

Im in the same boat (4.10's or 4.56's), except im coming from 3.21's Anything is better.