K1 Clutch Bonded Piston fits Mercedes-Benz 722.9 7G-Tronic Trans 2004-Up

K1 Clutch Bonded Piston — Compatible with Mercedes-Benz 722.9 7G-Tronic Transmission

This K1 Clutch Bonded Piston is built as a direct replacement for OEM 220-272-3231, designed for the Mercedes-Benz 722.9 (7G-Tronic) 7-speed automatic transmission.

Why You Need This Part The K1 bonded piston is a known wear item in the 722.9 transmission. As the bonded rubber seal ages, it can crack or lose its seal, causing:

• Harsh or delayed gear shifts
• Slipping between gears
• Shift flares on the 1-2 or 2-3 shift
• No-movement or hesitation when accelerating
• Burnt smell from a slipping K1 clutch pack

Replacing the bonded piston restores proper hydraulic apply pressure to the K1 clutch pack, helping bring shift quality back to factory feel.

Fitment Fits Mercedes-Benz 722.9 / 7G-Tronic 7-speed automatic transmissions found in:

• C-Class, E-Class, S-Class, CL-Class, CLS-Class
• SL-Class, SLK-Class, ML-Class, GL-Class, GLK-Class, R-Class
• Sprinter Van (Mercedes-Benz and Freightliner)
• Model years 2004 and newer

Please confirm your transmission code (722.9) before purchasing to ensure correct fitment.

Installation Note This part is intended for use during a 722.9 K1 clutch service or full transmission rebuild. Use proper transmission assembly procedures and torque specs when reinstalling.

Quick Tip Pairing your rebuild with Lubegard ATF is a smart move — it's trusted by transmission rebuilders for smoother shifts and added protection right from break-in.