So I just bought my 2002 Grand Prix GT. I noticed that after the car warms up and a few miles have passed the transmission begins shifting harshly. Now from what I've read on here it seems to be the EPC solenoid, I am noticing a high pitched squeal, but not really a whine. This is the only problem I am seeing so far, so am I correct in suspecting the EPC solenoid?
Is this the solenoid I need :
Also does anyone know if the Haynes manual covers replacing this solenoid? If not does anyone know of a how-to/walk through they can point me to?
Edit : Is there an updated part that shouldn't need replacing again?