Superior K085 Piston, Overdrive Servo (Super Servo) 4R70W AODE 4R75W 4R75E 93-14 The AOD-E / 4R70W Super Servo offers greater holding capacity, a more positive 4th gear, helps eliminate premature overdrive band failure and is built of 6061-T6 billet aluminum. This servo also offers an additional Teflon sealing ring for better centering and sealing along with a high temperature deep groove lip seal. A must for all long term rebuilds.