Having read the wonderous benefits of going synthetic I have decided
to change out my gearbox oil. Just to make sure I know what I am doing I
have a few questions.

     Do the various grades of synthetic correspond to the same grade of
Dyno?

     Would there be any benefit in flushing out all the old dino-lube with
some kind of "transmission flush" or is a simple "drain the old, dump in the
new" just as good?

     Would those advocating flushing (if any) please also recommend a
flusher?

Thanks