OK, I turned the trans modulator 2 stops anticlockwise, drove around for half an hour stopping and starting off and NO FLARING!!!!!!!

The trans now shifts noticably but not harsh or with a clunk.

Maybe I should have only gone 1 stop? Maybe this is what the shift is like for others? It's not seamless but comfortable.

Thanks everyone.

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1988 W126 420 SE

beware of fundamentalists!

Their is no right way for the trans to shift, whatever the driver prefers is the right answer.

However a little firmer shift will wear the clutch packs slower.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200