well, pops, to be honest, i know what typically happens when metal/metal rubs. though the diff balls experiece an infintesimally small slip as they roll, i'll assume it's negligeable. i think the diff will still last an acceptably long time. i might be wrong though. how does dirt and debris affect the unlubed diff versus lubed. i was looking for someone who may have tried it. i'm working on a hybrid car in my head, and it may consist of open shaft drive. in which case i'd prefer to use as little lube in the diffs as possible. i guess i can get away with some.
any other opinions or tales?
thanks guys.