Dodge A727 (42RE/RH) & A518 (46RE/RH) Transmission Low & Reverse Steel Super Servo Piston Package This Super Servo from Superior will improve all A727 & A518 Transmissions. This Super Servo will provide a newly designed piston which is much wider and uses a teflon support ring along with a lip seal to create a completely stable piston that will not flip in the bore. This package will also move the lip seal up and out of the worn area in bore (a real case saver!) and is constructed of steel for strength.