Some of those have a balancer on them, I believe, on the tranny tailshaft.

If it's loose and clanking, I believe you can just remove it, but I'm not sure, so won't recommend you do so.

Surely on of the "real" techs will help.

The only other thing that could be loose is the tailshaft itself, either a bad bushing or just loose nut. Never heard of that, though.

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!