I have an 06 limited 5.4 with 135k on it. It shutters around 40-45 mph. I've replaced plugs, coils, cam sensors with only slight improvements. I found out here that a transmission fluid change helps. What type of fluid does it take? Mercon v or sp? Is dropping the pan and replacing the filter the best way? I've read that it's not a complete fluid change because of the torque converter and that there's a way to do a complete change yourself?
thanks
thanks