Diff fluid and shocks?

[GR8 PMKN]

I have a set of RC4WD Superlift shocks which I am going to remove the springs and add 5000 Wt Diff fluid. How much fluid do I add to each? I read to not fill them completely but they did not reference on how much exactly.

Thanks

 

[afrofroggy]

Just do about 5 drops in each as its just there to lubricate
the piston