So, I've changed diff fluid a few times. I got a Hyper 10sc and am putting 5,5,2 in the diffs. I have the 5,5 but don't have any 2,000 fluid at hand. All the diff has in it is that grease that it comes with from the factory. Which leads me to my question. What would the grease be more like... 1,000 fluid or 10,000 fluid?

I am trying to decide if I should leave the rear diff with just the grease or put 5 in it, just until I get by the hobby shop and buy the 2.

grease =1000

Thank you.