with my spare whiny diff i want to move the crownwheel away from the pinion by using the castellated adjusters on the side of the casing to edge it over slightly. I've paid a decent amount of cash to get an unusuable diff, so haven't got much to lose if i fail.
With my current clattery diff, if the bearings are ok, i thought i'd try bringing the crownwheel closer to the pinion. Again, not much to lose as i don't fancy paying someone to give me another duff diff. It may be that the bearings are dead, causing the crownwheel to have sideways play, causing the noise, in which case i'll either bin or attempt replacement. However, i have not heard any bearing noise.
Finally i'd like another spare diff if my attempts fail!