Rebuild Masterpack 6T70, 6L80 TEHCM

Kit 124740-28K is discontinued and replaced by 124740-70K and 124740-TL70. Rebuild Masterpack 6T70, 6L80 TEHCM Laminate Discs (40) Seals (40) Seal Installer Piston Seal Plunger Laminate Installation Tool Listed GM 6-speed transmissions often set various trouble codes related to failures of fluid pressure switches that are internal to the transmission electro-hydraulic control module (TEHCM). These codes may be accompanied by TCC apply problems or shift irregularities such as slipping, flares, harsh application, and bind-ups. As time goes by, the laminated portions of the pressure switches can breach, preventing normal switch operation. If more than one switch breaks down, failsafe mode can be triggered. Since switches cannot be obtained through OE channels, replacement of the TEHCM was the only previous remedy available. It is no longer necessary to replace the expensive TEHCM assembly to rectify this concern. Installing Sonnax pressure switch rebuild master pack 124740-28K restores normal switch operation, eliminating codes and providing renewed shift performance in all ranges. Allows salvage of expensive TEHCM Installation tools included in kit Symptoms: Erratic TCC apply Failsafe mode Harsh shifts Pressure control out-of-range codes Pressure switch codes Shift codes Slips, flares it will not rectify electrical breakdown. See instructions for details. Alternative number: 124740-70K