In GM 4L60 units, modifying or replacing the throttle valve is a common practice during rebuild, but these modifications and replacements often alter performance, leaving the core unusable. Sonnax replacement throttle valve 77968-02 aids in restoring the core to original condition by following the OE design.
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.