RE: Should I lube the differential?
maybe describe your lube......
if it's not a sealed diff than i wouldn't use the actual diff oil, as it will just leak out when hot and make a mess. But as for the redcats i'm sure if they are sealed or at least the caldera.
I use good high temp white lithium grease in my diffs, don't need to be swimming in it but enough to keep things covered..