I would say that you didn't set up the diff
right, that's about the only way to destroy
a R and P set, even set up poorly you should
get several thousand miles before failure.
Of coarse I wasn't there to see the setup
so I shouldn't comment on it being right
or wrong, this is just an experience baised
statement, I nuked a set of R and P in an
Audi I had, that one required shims to set
up, and the |removethispart|@$$ wipes at the machine shop
screwed up the thickness I requested, I put
it together anyway and it lived 5 or 6 months
I never saw the nuked set, but it began to whine,
louder and louder day by day, until one day it
went in grand style, chunk bang clunk vroom
free reving engine

nuked gear set
Wild