Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
One of the gears, cant remember which, is known to ocassionally shear off the locating dogs.Drop the sump pan and see if any bits in there
I recently replaced my 550 gear cluster that is driven by the clutch. Only one of gears was damaged so if you need anything off there it's yours for postage costs only.