[Cam]

If I remember correctly trevor posted an in-depth description on this forum about the solenoids in the transmission. IIRC, Duty Solenoid A controls a pilot valve that in turn disrupts the flow of hydraulic fluid which is how it controls line pressure. I would think that if it is malfunctioning, it could be behaving erratically and may have negative results on the transmissions friction materials (I don't believe that would explain the shaking). Maybe one of the more knowledgeable folks on here could help out more on that, I am definitely NOT a transmission guy.