It is just trans gear rattle, It is caused by the high compression engine in which every time a cylinder fires it sends a pulse through the crank, If the dual mass flywheel cannot absorb it all it will transfer into the trans causing the gear rattle.
The Dual Mass Flywheel is sprung like the center of a clutch, Once this is bottomed out (taking off) it may transfer some of the engine vibrations into the trans. Condition of the sprung section will determine how easy it bottoms out, If it is getting worn, it will be worse.
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