That Dana 30 Detroit in Moab will be very hard on those front shafts. If you can run 2 Low most of the time, and only engage the front when needed, those front axles will be much happier. That grip out there is like driving on the street.
I'm running a Dana 30 Ox Locker with 33's, I'm sure the selectable locker helps, and the 44 sized shaft u-joints.