Aisin AW 55-50SN and AW-51SN transmissions can have TCC apply and release complaints, inadequate lubrication and TCC codes as a result of wear at the inside diameter of the lockup relay control sleeve due to continuous valve oscillation. This results in valuable converter feed pressure to flow directly to exhaust and prevents the relay control valve from properly positioning the inboard valve to control the flow of apply and release oil to the converter. Installing the Sonnax drop-in lockup relay control valve kit S89741C restores proper hydraulic control with a highly wear-resistant billet sleeve and hard-coat anodized aluminum valve. Sleeve is manufactured from highly wear-resistant billet aluminum; Hardcoat anodized aluminum valve combats premature wear; Drop-in Zip Valve™ parts install quickly and easily
Valve and Sleeve; Lock-Up Relay Control
