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Salvage the expensive TEHCM in listed GM 6-speed transmissions by replacing lost or damaged pistons with a direct replacement Sonnax pressure switch plastic piston 124740-72K. To replace an OE piston, simply clean debris from the pressure switch cavity using low air pressure (30 psi), then gently install a new piston with a pick as shown here.
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.