Some will say otherwise, and really to each their own. It's not a great idea to run locker up front on the d30. The rear, it depends on if you want to run an air compressor for air lockers or if you want electrical. That too is personal preference. You will have just as many say air as you will that say electrical locker. If you go with air the big favorite is ARB. If you go with an e-locker get one that is a 4 pinion so it's a much more solid engage, Eaton is the choice there. If it's your daily really these are your top choices. If it's a trail rig then there are a few more options but it takes away the streatability of it.