Fluids for D30 & 8.25?

I want to change the fluids in my axles and the guy at NAPA gave me AMSOIL 75w-90 for the front and rear axles. Do the front and rear take the same lube. And do I need any additive for the rear? It say's on the bottle if it starts to chatter to add a slip lock additive.

Yes same for front and rear.
Slip lock additive only needed if you have a limited slip Diff.