I 've run an Aussie in the front D30 for a couple of years, reliable and works great. They do noticably click when turning but nothing too horrific. So you are going to regear and obviously want a locker, considering the cost of a trutrac ($400 ish) I would suggest you look into an S35 kit for the rear. Best upgrade out there for a D35c.
From stock to big rock just enjoy what you got