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Machining Required

Machining Required

9-1/2" LU

Piston Plate

Part No.


Piston Plate
  • Piston Plate


9-1/2" LU

Piston Plate

Part No. CH-DA-3P

  • Material: Steel
  • Surface Finish: Reactive
  • Machining Process: Fully Machined Forging

Chrysler 9-1/2" LU converters have a high rate of failure due to the pressure spikes caused by the transmission, and reliable lockup pistons are hard to find. Sonnax offers piston plate CH-DA-3P, an improved design with increased wall thickness in critical areas, making for a stronger and more durable piston. This piston plate has a reactive surface finish like the OE piston, but is designed for a .045" thick friction ring instead of the OE .070" drop-in friction rings.

  • Made from billet steel
  • Increased wall thickness for greater stiffness
  • Reactive surface finish
  • For bonded front covers

This piston does not include the damper spring retainers. The spring retainer must be salvaged from an OE piston assembly and welded to the new piston plate.

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