My 82 w126 300sd seems to have developed a bad driveline vibration....but weird.

If I am driving at 65mph, on a flat surface, it seems fine. Head down a hill, and it starts vibrating, and feels like it's from the rear. Slow down a little and it appears to get worse while deccelearting.....


Flex disks? I'd pop under and take a look, but it's been snowing here since Thursday night....they say it should stop in the next day or so.

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79 300SD - $50 out of pocket purchase
03 Dodge Ram 3500 CTD
2003 VW Jetta TDI