[bender]

Jason,

Never use "moly" grease in ball diffs. This grease is not designed for high shear pressure use - great for metal bevel gears, but not for ball diffs.

You should always use a silicon grease for the main diff rings and balls. For the thrust race, the Tamiya Anti Wear grease (as Jimmy said) will work well, as will Associated "black" grease or old Losi "red" grease.