September 30, 2005
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.
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.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.