All of a sudden the 400E started with hard shifting. It bangs harsh when shifting. I was driving very softly ...probably makes it even worse.
Maybe the vacuum line from modulator is disconnected (no vacuum) or the modulator at transmission died?

Vacuum line to tranny modulator: is this line a black vacuum line that starts at the driver side behind the fire wall from a switch over valve?

How can it tested best?

Thanks, Martin