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4F50N (AX4N)

Piston Plate

Part No.


Piston Plate
  • Piston Plate

  • Fd-da-18pb_alt

Small_fd-da-18pb Small_fd-da-18pb_alt

4F50N (AX4N)

Piston Plate

Part No. FD-DA-18PB

  • Thickness: 0.200"

The Ford 4F50N (AX4N) converter is prone to weak and/or broken spring clips, and a worn mating piston causes noise in this unit. Bending or replacing the spring clips is only a temporary fix. Sonnax clutch conversion plate FD-DA-18PB is a drop-in replacement that uses the existing damper, but converts the clutch from a 2- to a 1-friction ring piston. This eliminates the noise problem found in the OE units. FD-DA-18PB pistons can be identified by their "0" stamp.

  • Replaces noisy OE multi-plate clutch assembly, which is not available
  • Machined from a steel forging
  • Increased wall thickness for greater stiffness

This piston may not be suitable for high performance or heavy-duty towing applications.