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Home >> Hummer >> 2007 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 1055 (Automatic Transmission - 6L50/6L80/6L90 - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Off-Vehicle Repair Instructions >> 1-2-3-4 & 3-5 Reverse Clutch Overhaul (6L90) >> 1-2-3-4 Clutch Piston Removal

1-2-3-4 Clutch Piston Removal

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of 1-2-3-4 Clutch Piston & Components
GM1555358Courtesy of GENERAL MOTORS CORP.
1-2-3-4 Clutch Piston Removal

Callout Component Name
1 1-2-3-4 Clutch Piston Dam Retaining Ring.
NOTE: Use care when compressing the 1-2-3-4 clutch spring and dam assembly. Compressing the dam assembly too much may damage it.
NOTE: Refer to Retaining Ring Reuse Notice .

Special Tool: 
J 38734  Intermediate Spring Compressor Adapter. See Special Tools .
2 1-2-3-4 Clutch Piston Dam Assembly
3 1-2-3-4 Clutch Spring
4 1-2-3-4 Clutch Piston
Tip: 
  • It may be necessary to apply air to the apply passage in order to remove the piston. Install the 1-2-3-4 clutch housing onto the torque converter (with fluid pump) housing assembly in order to apply air.
  • After air is applied, it may be necessary to turn the housing assembly upside down and carefully tap the housing against a flat surface in order to release the piston.