I would not put any kind of locker in the rear D35 until it is upgraded with a Super kit, or a different axle swapped in. Money saved there.
The front would depend on what gears you are starting with, and the carrier break on the D30.
The carrier break on the TJ D30 is 3.55/3.73
If you have 3.07 gears now, and are regearing to 4.56, you will need a new carrier, and your aussie will not work anyway. You will have to get a new carrier and new aussie. Or, buy a full case locker. Preferably a selectable like an ARB.
If you are already on the correct side of the carrier break, (3.73's) you can re gear and throw your aussie in there.