Not sure yet, when we go wheeling, i put it in low and it works quit well. When we put the transfer case in low the third gear is just a little less than first in high gear. So we end up with two lower gears, does very well. But i plan to re gear once i figure out what ratio will work best for me. With tock tires we have to shift to often, need to be able to run the a gear longer. With 33' inch tires going to a 4.27 gear will put it bach to a stock RPM, and will probably have the same affect, so i don't think i will go to that, Looking more so at 4.11, IMO with a diesel engine, low RPM torque we do not need as much gear as a normal gas engine would. If you are setting up your toy for rock climbing then a higher ratio will be wanted. I guess you are a Cummings fan, well i sure am i have an 06 with manual trans, 3.73 gears and run 35" tires. well the 35" compared to stock make the truck much better, i don't have to shift as soon. A Cummings with a 4.11 gear is a night mare, can't stay in a gear and tacked out on the highway. My point is i don't want to go to high and not like it, but wanted to get e locker in the front so i can really test it out on the trails before i pull the trigger on gears. Once i make up my mind i will be adding the rear full floating axle kit.