YOMI Accumulator Piston Set and Plate Repair Kit for 45RFE/545RFE/68RFE

The YOMI Accumulator Piston Set and Plate Repair Kit is designed to restore reliable performance in Chrysler automatic transmissions that use the 45RFE, 545RFE, and the 68RFE family, including 65RFE and 66RFE variants. When piston scuffing and bore wear creep into late-model valve bodies, clutch apply pressure can leak, resulting in slipping or inconsistent shifts. This kit addresses those issues with a purpose-built 5-piece accumulator piston set and a reinforced accumulator plate, offering a practical, durable solution to extend transmission life and maintain smooth operation. Manufactured to upgrade from original plastic pistons, the YOMI kit uses robust materials and dual-guide seals to reduce wear and keep pressure consistent under higher service pressures.

Each piston features dual guide seals at both ends to prevent piston-to-bore contact when side-loaded, a common failure mode that leads to scuffing and leakage. The redesigned seal groove arrangement allows the oil sealing location to sit in a less-worn portion of the bore, enabling salvage of bores with moderate wear. By upgrading to 6061 billet aluminum, these pistons provide a sturdier foundation for late-model applications and help guard against piston failure that can trigger broader transmission faults.

The accompanying accumulator plate kit offers a strengthened solution to plate flex under piston impact. The thicker steel plate, plus three extra mounting holes and high-torque screws, keeps the plate secured against normal vibrations, reducing the risk of loose screws and plate flex that can compromise valve body integrity. This combination of piston and plate improvements helps restore precise hydraulic control and improve the longevity of the transmission’s clutches and bands.

Whether you’re a professional rebuild shop, a transmission technician, or a do-it-yourselfer looking to salvage a worn valve body, this kit provides a comprehensive upgrade path that directly targets the root causes of accumulator wear and plate flex in the target transmission families.

Benefits & Tips

• Improve clutch apply consistency by reducing piston-to-bore scuffing and leakage in 45RFE/545RFE/68RFE-family valve bodies.
• Increase salvage potential for bores with moderate wear thanks to the relocated oil seal location on the pistons.
• Install with confidence on late-model units using a thicker accumulator plate that resists flex and loosening under typical failure modes.

Product specifications

• Compatibility: 45RFE / 545RFE / 65RFE / 66RFE / 68RFE automatic transmissions (1999-on).
• Kit includes: 5 accumulator pistons, 10 guide seals (PTFE, solid), 5 seals (PTFE, scarf cut), accumulator plate, accumulator shim, 6 screws, 6 washers.
• Pistons material: 6061 billet aluminum.
• Seal design: dual guide seals (one at each end) to prevent bore scuffing during side loading.
• Plate upgrade: stronger, thicker steel plate with three additional mounting holes for secure installation and higher torque resistance.
• Updated seal locations: allows use in bores with moderate scuffing, extending service life of the valve body.

Package includes:

• Pistons (5)
• Guide Seals (10) PTFE, Solid
• Seals (5) PTFE, Scarf Cut
• Accumulator Plate
• Accumulator Shim
• Screws (6)
• Washers (6)

Warnings/Reminders

All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.

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