I put 35" BFG KM2 tires on my 2008 Rubi along with a 3" Rough Country lift. I really like the set up and have noticed a slight difference in "power" when running 55-65 mph. I'm considering a performance tuner but when I turn off my overdrive, the RPMs increase and the Jeep stays in 3rd longer thus providing better power at higher speeds. Beside a decrease in fuel economy, are there any long term problems that can be created by driving consistently with OD shut off? Thanks!