Driving down the mountain today I'm more and more thinking its a worn damper issue instead of something serious. Still planning to check the diff mounts and rear flex disk first and hope that's the problem. Was raining last weekend so spent my time thinking about it in front of the TV instead of getting under the beast to check. Will report back soonest.

While I'm here, anyone like to report on probable life of the rear flex disk? I've seen it suggested that the front should be good for 60,000 miles. My front disk was looking pretty shagged when I swapped it out at 100,000 miles, although the fact that the balance weight had been welded up suggests it may have been changed or at very least looked at sometime in the dim and distant. Center bearing was OK.

Same goes for the diff mounts, how long before they need replacing?

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1987 300e manual 250,000 km (sold)