This was interesting, two spring pistons inside a sleeve with a sprung damper on the end!. Just going to put some miles on it now, it was completely undrivable last week, wouldn't even engage reverse on Friday morning. Hard to photo but the Seafoam did react with somthing as there was globules floating on the top afterwards. I did give all the solenoids a good kicking (1 amp 9v supply) whilst cleaning as well so could have been some sludge that has dislodged. Must say the oil changes with Hydra Trans deffinitely cleaned the majority of the gearbox very well.