A bad center bearing carrier will, as you found out, allow the driveshaft to "orbit" at certain speeds and loads, causing vibration.

The usually croak around 150,000 miles or so, just like flex disks, shocks, and engine mounts.

Not a bad job, all said and done, just dirty.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!