Perhaps he is talking about these pressure accumulator pistons.



If the box is taken apart I assume the torque converter is renewed or refurbished anyway as it's still the weakest link on this gearbox.

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E39 530dA -02 M-Sport Messing metallic
E53 X5 3.0dA -06 Sport Stratus grey
E70 X5 40d -12 M-Sport Space grey