For the best shift feel and timing of any servo combination, you need Performance Automatic's C6 Pro Shift Super Servo. This servo is designed to replace the Ford "R" servo. This is the part you need to give that C6 a positive 1-2 and 2-3 shifts as well as a clean 3-2 kick down.
The C6 Pro Shift Super Servo is American made and constructed from 6061-T6 billet aluminum. In its design, a lip seal replaces the O-ring for better static release into 3rd.
The Performance Automatic C6 Pro Shift Super Servo fits all Ford C6 transmissions from 1967-1990.