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In D4 second gear, the 2-3 SS valve is energized and the 2-3 shift valve train is in the downshift position Control Valve Body Ball Check Valve - M33 Only Fluid pressure, from the automatic transmission secondary fluid pump assembly, unseats the ball check valve to Torque Converter Clutch TCC Solenoid Valve Under normal operating conditions, in Overdrive Range-Second Gear, the PCM keeps the normally open TCC
2004 Hummer H2 2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E
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