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AX4S, AX4N (4F50N), CD4E, 9-1/4" (3.0L & 2.3L)

Piston Plate
Part No. FD-DA-19PB

The AX4S, AX4N (4F50N) single clutch converters have a piston that is prone to cracking due to manufacturing flaws. A cracked piston will not only lock up improperly, but will shave material off the OE friction ring. This loose friction material will contaminate the whole transmission. The Sonnax FD-DA-19PB, a fully machined forging, is a replacement piston plate that corrects this OE problem. Friction ring B66300HTL is recommended for use with
FD-DA-19PB.

  • Replaces the OE piston that is prone to cracking
  • Machined from a steel forging
  • Increased wall thickness for greater stiffness
  • Lock-up surface machined to specific requirements to ensure a great bond
  • Thickness: 0.200"
  • Existing Customers: Contact your sales representative.
  • New Customers: Fill out the form and a sales representative will contact you.
  • Fd da 19pb
  • Fd da 19pb crackedoepiston alt