Rebuilt tranny (from German Star).
Very experienced mechanic--didn't note any problem with the new mount I provided. The part numbers on the packaging are correct; though I suppose any of the provided parts (flex discs or mount) could conceivably be defective.
The "doc's" assertion that the problem is rooted in the differential mount is both interesting and logical. As noted above, all the symptoms have vanished and I'm reasonably comfortable that there's no urgency here. When I'm down under the next time (fuel filter's about due for a change), I'll definitely check-out that diff mount.
Thanks to all for the time and effort on my behalf.
