Transmission Parts Aisin AW 55-51SN 55-50SN Valve Body Valve / Sleeve

Symptoms:

No lockup
TCC apply & release concerns
Delayed lockup
Burnt converter
Inadequate lubrication

Cause:

Worn and/or sticking lockup relay and control valves can prevent full TCC apply or release, which can create multiple TCC symptoms.

Correction:

Ream the bore and install Sonnax oversized lockup relay valve kit to restore hydraulic control of the TCC circuit.

55-50SN, 55-51SN

Oversized Lockup Relay Valve Kit
Part No. 59947-77K

Also fits AF23/33 and RE5F22A.

Tooling:

F-97741-TL20
VB-FIX

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Vehicles equipped with Aisin AW 55-50SN and 55-51SN transmissions often exhibit several common concerns related to wear in the lockup relay valve bore. Oscillation of the lockup relay valve and stroking of the lockup control relay valve in its sleeve results in wear, which creates a loss of hydraulic control of the lockup circuit. Various TCC apply/release related concerns develop in these cases. Sonnax oversized lockup relay valve kit 59947-77K allows the bore to be refurbished, restoring normal TCC operation.

Sleeve is manufactured from highly wear-resistant aluminum
Hardcoat anodized aluminum valves combat premature wear

Contents

Control Valve
Lockup Relay Valve
Control Sleeve

Valve Body Layout

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.