Bore wear at the TCC control valve and/or sleeve results in the torque converter clutch remaining applied and transferring the shift shock. Loss of TCC control also results in RPM fluctuation.
The Sonnax oversized lockup control valve and boost assembly kit corrects circuit pressure loss and restores control of the TCC lockup circuit.
Bore wear at the lockup control valve in Aisin AW55-50SN transmissions results in loss of torque converter clutch control. The TCC can remain applied transferring shift shock, or loss of lockup control can result in RPM fluctuations. Sonnax lockup clutch control valve and boost valve assembly kit, 59947-29K restores control of the TCC. Proper TCC control eliminates the shift shock and RPM fluctuations associated with a worn lockup control valve.
Both hard-coat anodized aluminum lockup control valve and boost valve resist wear and fit tighter to the bore than OE for better sealing
The boost sleeve is highly wear-resistant to increase life