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
Drop-in Zip Valve™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs

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