Gearbox noise

[Stevemex]

So when I drive I get a loud clunk when I let off or accelerate all the bushes and mounts avec been changed but I have used aftermarket drive shafts in the past not sure if that would be the cause. The issue has been on going still trying to get to the bottom a specialist gearbox company said the box is fine but I’m unsure now what it could be 02m 6 speed box 1.9pd

[Steve Q]

Could it be the clutch and duel mass flywheel?