Wear at the solenoid modulator accumulator bores in Aisin AW TF-81 units is very common. Wear allows solenoid feed pressure to exhaust resulting in various shift complaints and/or codes. Sonnax solenoid modulator accumulator piston kit 39741-14K incorporates an O-ring for positive sealing and annular grooves for better centering and wear prevention.

• Pistons incorporate an O-ring for positive sealing, even on worn bores
• Annular grooves added for better piston centering and wear prevention
• Anodized aluminum piston combats premature wear and eliminates thermal expansion related leakage