That grease should work ok... but make sure you take out the rubber o-rings before you hit it with brake cleaner. It will chew them up and ruin them. Then when the grease gets warm it will leak out and make a mess.
Why not use silicone oil? It works better than grease and gives you more of a posi-traction diff.
Why not use silicone oil? It works better than grease and gives you more of a posi-traction diff.