cant find a rubi on a lot with 4.10 is it a must? Biggest tire i would use would be 35 max.

 

Pretty well your at the bottom limit for a gear change with 4.11 and 35". Road driving will be OK and minor off road. With 35" and rocking you'd need a gear swap for best results but for minor 4 wheeling and road use 4.11 will be ok especially with the auto 3.6. Don't get the lower gears.

From Newbie stick top of this forum;
"Q: What gear ratio should I be running with 35" tires?
A: In order to bring your Jeep's performance back to stock, you will need to run 4.88 gears with 35" tires. However, if you are looking for a little extra power, you should consider getting 5.13's. This is especially desirable if you have an automatic transmission."
This was for the 2007 to the 2011. The auto is better in the 3.6.

 

well all the rubis up here are 3.73 that good enough for 33 duritracs

 

4.10 definitely. I have the 12 JKUR with 4.10 and running 35's and it's still awesome. 6th gear is useless unless you're in Kansas tho

I drove a 12 6spd like mine and it was on 37's and still had some go. Especially when the 3.6 gets up in 2500-3000 rpm. I'm making the move up to 37's on 4.10's in a couple weeks. 4-Low on 4.10's is just such an awesome slow creep. If you want to go 35" tire I would go with 4.10 for sure. Even just to slow everything down for better crawling. Plus you'll get better mpg with the lower gearing