Sonnax 44894-01MK, 45RFE / 545RFE / 65RFE / 66RFE / 68RFE Accumulator Piston Kit

$ 116.00


SKU: SX 44894-01MK, a12 ra b6 Categories: , , Tags: ,


45RFE / 545RFE / 65RFE / 66RFE / 68RFE Accumulator Piston Kit, Sonnax 44894-01MK. 

Accumulator piston scuffing and bore wear are common issues in listed Chrysler valve bodies, especially when running at increased pressures. The OE accumulator pistons have two seal rings. The seal groove at the open end of the piston has a larger diameter, with the seal ring acting as a guide to prevent piston-to-bore contact. The seal groove at the closed end of the piston has a smaller diameter, and the seal ring acts as a conventional seal. However, due to the smaller seal groove diameter, the piston will contact the bore when side-loaded, resulting in scuffing, wear, and leakage of clutch pressure.

Each piston in the Sonnax accumulator piston kit 44894-01MK features two guide seal rings, one at each end of the piston, to prevent piston-to-bore scuffing when side loaded. Additionally, the oil sealing ring location is relocated on the piston, allowing it to run in an unworn portion of the bore, enabling bores with moderate scuffing to be salvaged. Manufactured from 6061 billet aluminum, these pistons will upgrade late-model applications with plastic pistons to prevent transmission failure due to piston breakage.

  • Dual-guide seals prevent piston-to-bore scuffing
  • Updated seal location allows use in scuffed bores
  • Prevents transmission failure from broken plastic pistons
  • Drop-in Zip Valve parts install quickly and easily

See instructions for details on allowable bore wear. This kit has 5 pistons for the RFE units. Other related applications require different numbers of pistons and can be serviced with this kit and/or single piston kit 44894-01K.


  • Pistons (5)
  • Guide Seals (10) PTFE, Solid
  • Seals (5) PTFE, Scarf Cut

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Additional information

Weight 2 lbs
Dimensions 6 × 6 × 2 in