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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Automatic Transmission Servicing (4L80-E)) >> Removal & Installation >> Control Valve Body >> Removal

Control Valve Body: Removal

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  1. The following components can be serviced without removing the valve body from the transmission. Ensure that removal of the valve body is necessary before proceeding. See Fig 1 .
    • The 2-3 solenoid (1).
    • The internal wiring harness (2).
    • The 1-2 shift solenoid (3).
    • The transmission fluid temperature sensor (4).
    • The transmission fluid pressure manual valve position switch (5).
    • The pressure control solenoid (6).
    • The Torque Converter Clutch Pulse Width Modulation (TCC PWM) solenoid (7).
  2. Remove the fluid level indicator. See Fig 2 .
  3. Raise the vehicle.
  4. Remove the oil pan, gasket and filter. See DRAINING & REFILLING  under LUBRICATION.
  5. Disconnect the internal wire harness from the Transmission Fluid Pressure (TFP) manual valve position switch.
    CAUTION: Use care not to loose the 5 "O" rings that are located between the TFP manual valve position switch and the valve body.
  6. Remove the control valve body bolts (1) that retain the TFP manual valve position switch (2) to the control valve body. See Fig 3 .
  7. Remove the TFP manual valve position switch.
  8. Disconnect the internal wiring harness electrical connectors from the remaining valve body electrical components.
  9. Remove the lube oil pipe bolt (6) and retainer (7). See Fig 4 .
  10. Remove the lube oil pipe (5). See Fig 4 .
  11. Remove the bolts and remove the manual shaft detent spring (3). See Fig 4 .
    CAUTION: Keep the control valve body level when lowering it from the vehicle. This will prevent the loss of checkballs located in transmission case passages.
  12. Remove the remaining control valve body bolts.
  13. Carefully lower the valve body down from the transmission case. Use care not to drop the manual shaft valve.
  14. Remove the control valve assembly (2) which includes the following:
    • The accumulator housing assembly (1). See Fig 4 .
    • The control valve assembly to the spacer plate gasket.
    • The spacer plate.
  15. Remove the manual valve (1) from the control valve body. See Fig 5 .
  16. Inspect the manual valve for nicks and burrs.
  17. Remove the spacer plate to case gasket (2) from the case. The gasket may stick to the spacer plate. See Fig 6 .
  18. Remove the PWM screen (1) from the case passage. See Fig 6 .
  19. Remove the manual 2-1 band servo assembly (1). See Fig 7 .
  20. Remove the servo piston cushion spring (2). See Fig 7 .
  21. Remove the manual 2-1 band servo piston pin retainer ring (4). See Fig 8 .
  22. Remove the manual 2-1 band servo piston pin (1). See Fig 8 .
  23. Remove the manual 2-1 band servo piston seal (2). See Fig 8 .
    CAUTION: Do not use a magnet in order to remove the checkballs. Using a magnet to remove the checkballs may magnetize the checkballs, causing metal particles to stick.
  24. Remove the eight checkballs (nine checkballs for some models). See Fig 9 .
Fig 1: Identifying Valve Body Components
G00220014Courtesy of GENERAL MOTORS CORP.
Fig 2: Removing/Installing Fluid Level Indicator
G00220015Courtesy of GENERAL MOTORS CORP.
Fig 3: Removing/Installing Control Valve Body Bolts
G00220016Courtesy of GENERAL MOTORS CORP.
Fig 4: Identifying Lube Oil Pipe Bolt & Retainer
G00220017Courtesy of GENERAL MOTORS CORP.
Fig 5: Removing Manual Valve From Control Valve Body
G00220018Courtesy of GENERAL MOTORS CORP.
Fig 6: Removing Spacer Plate-To-Case Gasket From The Case
G99B50394Courtesy of GENERAL MOTORS CORP.
Fig 7: Identifying Manual 2-1 Band Servo Assembly
G00220019Courtesy of GENERAL MOTORS CORP.
Fig 8: Removing Manual 2-1 Band Servo Piston & Components
G00220020Courtesy of GENERAL MOTORS CORP.
Fig 9: Locating Eight Checkballs
G00220021Courtesy of GENERAL MOTORS CORP.
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