My advice is to leave the diff work to an expert. I am an ASE certified tech and I won't touch the diffs. At $650 + each, those ARBs are an expensive experiment. I did the lift, shocks, tires, etc on my own. But I have a full complement of tools and a shop at my disposal. You might want to do as Schlud said and hook up with a club and find those more experienced than yourself to help you out. That way you can learn and when something breaks you will know how to fix it. Notice I say when and not if. Serious off-roading will take its toll as Schlud said so be prepared to pay the price.