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

Symptoms:

Delayed Forward
Increased throttle required for engagement

Cause:

Bore wear in the neutral relay valve results in leakage from the forward clutch circuit, which reduces the forward clutch apply pressure.

Correction:

The Sonnax oversized neutral relay valve and spring correct circuit pressure loss and restore control of forward clutch apply circuit.

55-50SN, 55-51SN

Oversized Neutral Relay Valve Kit
Part No. 59947-35K

Also fits AF23/33 and RE5F22A.

Tooling:

F-59947-TL34
VB-FIX

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Vehicles equipped with Aisin AW 55-50SN and 55-51SN transmissions may suffer from delayed Forward engagement and require increased throttle for engagement. These problems are caused by bore wear at the neutral relay valve, resulting in loss of clutch engagement pressure. This can be fixed with the Sonnax oversized neutral relay valve kit 59947-35K. The Sonnax valve kit restores clutch pressure, which will eliminate delayed engagement and the need for increased throttle.

Hardcoat anodized aluminum valve combats premature wear
Tighter fit to bore than OE for better sealing
F-59947-TL34 tool kit can be used for both 59947-34K and 59947-35K oversized valve kits

Contents

Valve
Spring
End Plug

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.