Have a 2007 Rubicon Unlimited with automatic and wondering what the gear size is. When going 70mph verified with GPS I'm at 2200rpm's. Jeep gets up and goes quick, but I don't want to open up pumpkin to count teeth cause I did the fluid when I bought it a year ago. Just wondering so I can put it in my Traildash... wondering if that helps in any way when calibrating? Any thoughts?

 

Measure your tires --> measured, not mfg spec.
Then open the faq's stuck to the top of this modified area and scroll down to the drivetrain section and plug the number into the chart for your engine/transmission.

But, a little hint would be that all 07-11 rubicons came from the factory with 4.10 gears.

If you think a previous owner may have swapped gears, then lift a rear corner, spin the tire and count driveshaft revolutions.