B1 Bonded Clutch Piston for Mercedes-Benz 722.9 2004-Up

B1 bonded brake clutch piston for Mercedes-Benz 722.9 seven-speed automatic transmissions in 2004-up applications. Reference OEM part number 221-272-2031 when matching this part to your transmission rebuild or internal repair.

Part Details

• Part Type: B1 brake clutch piston

• Transmission Application: Compatible with Mercedes-Benz 722.9 automatic transmissions

• Design: Bonded piston

• Lug Count: 20 lugs

• OEM Reference Number: 221-272-2031

• Reference Thickness: Approximately 1.065 inches

• Reference Outside Diameter: Approximately 6-15/16 inches

• Reference Inside Diameter: Approximately 5.720 inches

• Quantity: One pistonamazon+1

Fitment And Installation Guidance

This is an internal transmission rebuild component. Confirm that the transmission is a 722.9 unit and compare the original B1 piston’s lug count, dimensions, and bonded-seal configuration before purchase. Do not rely only on vehicle make, model, or model year because multiple 722.9 internal configurations may exist.

A worn, damaged, or leaking clutch piston can affect clutch-apply pressure, but shifting complaints can also be caused by worn friction plates, steel plates, drums, valve body concerns, solenoid issues, fluid problems, or other internal faults. Have the complete transmission diagnosed before replacing internal parts.

Fluid Service

Refill using the transmission manufacturer’s specified fluid. If Lubegard ATF Protectant is used during service, verify compatibility with the selected fluid and follow the product directions. Lubegard ATF Protectant is not a substitute for repairing worn, damaged, or incorrectly assembled transmission components.