correct gear lube for 72 ss camaro rear end

Not a critical deal, any old differential uses the same stuff, severe duty that requires the EP gear lube. And if you see that S shaped spring and some clutch discs you'll need the additive.

 

Any 85w-90, or similar gear lube is fine unless it's a posi, then you will need that little bottle of GM positraction additive. Should take about 4 pints. There was this GM Special Formula gear lube in quart cans that was the magic elixir for posi clutch chatter. Today that stuff is unobtanium.