August 21, 2013
GM 6L45, 6L50, 6L80, 6L90 units may have TCC apply and release problems. Bore wear or a stuck converter feed limit valve can result in converter overheat, incorrect TCC apply or release, inadequate lube and cooling, and converter over-pressurization. Reaming the bore and installing the Sonnax oversized converter feed limit valve 104520-11 will restore proper valve function, resulting in proper TCC apply and release, regaining control of lube and cooling.
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.
NOTE: Must test with actuator feed limit (AFL) valve installed instead of converter limit valve. Position AFL valve so spool face and port face are flush as indicated.