Dodge A727 (42RE/RH), A518 (46RE/RH), & A618 (47RE/RH) Super Servo Piston Package This Super Servo from Superior will improve all A727, A518 & A618 Transmissions. This Super Servo provides the following improvements: 11% more holding power, firmer 1-2 shift, more positive 2-3 shift and is perfect for Heavy-Duty and Performance Applications! This Super Servo package includes the Heavy Duty Band Strut