6L45, 6L50, 6L80, 6L90, 6T70 (Gen. 1), 6T75 (Gen. 1)

6L45, 6L50, 6L80, 6L90, 6T70 (Gen. 1), 6T75 (Gen. 1) Pressure Switch Plastic PistonPart No. 124740-72K Package Quantity: 20 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.