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I have a D30 with an ARB, 4.56s, and chromoly shafts (if that helps any). what is the best gear oil to put in the diff? do i need any additives with the ARB?
I use Castrol synthetic 75W90. I don't see why you would need an additive, additives seem to be for limited slip differentials, I don't even use one for mine.
I just loaded up my axles with valvaline 80w90, no point in putting in synthetics if you're changing it regularly. (I have to change this batch in 200 miles as its new gears, after that I'll change it twice a year)
Friction additives are only for rear ends with a posi, and only if the manual or maker of the posi recommends it. It can actually damage other rear ends. Just use normal synthetic gear oil. There are 1000 kinds to choose from.