so i took the differential out today, alot easier then the internet made it seem... one clutch plate was broken and both side spider gears were chewed to hell. the truck seemed to ride fine before but i am going to the dealership to get new spider gears before i put everything back together. any ideas what could have caused all this damage? To many donuts in my truck with 200k miles maby? anything else i should check before i put the expensive royal purple in there?