C4 Reverse Servo Piston [DA4RSP]
Availability: In stock, usually ships within 1 to 3 days.
Price: $25.99 / Ea
One of the often overlooked parts when rebuilding a C4 is the Rear Servo Piston.
If the black rubber bonded ring on your piston is hard or crumbling, its time to replace it.
Lubricate the new seal with Trans Gel or ATF before install.