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Home >> Chevrolet >> 2005 >> Chevy Express H1500, Van Passenger >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Automatic Transmission - 4L80-E/4L85-E - Introduction & Repair Instructions) >> Repair Instructions >> Valve Body and Pressure Switch Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Valve Body Electrical Components And Wiring Harness
    GM730165Courtesy of GENERAL MOTORS CORP.
  1. Ensure that removal of the valve body is necessary before proceeding.
      IMPORTANT: The following components can be serviced without removing the valve body from the transmission:
    • 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. Fig 2: Removing The Oil Filter
    GM477602Courtesy of GENERAL MOTORS CORP.
  2. Remove the fluid level indicator.
  3. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  4. Remove the oil pan, gasket, and filter. Refer to Automatic Transmission Fluid/Filter Replacement .
    5. Fig 3: Removing TFP Manual Valve Position Switch
    GM237246Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Use care not to loose the 5 O-rings that are located between the TFP manual valve position switch and the valve body.
  5. Disconnect the internal wire harness from the transmission fluid pressure (TFP) manual valve position switch.
  6. Remove the control valve body bolts (1) that retain the (TFP) manual valve position switch (2) to the control valve body.
  7. Remove the TFP manual valve position switch.
  8. Disconnect the internal wiring harness electrical connectors from the remaining valve body electrical components.
    9. Fig 4: Lube Oil Pipe Assembly
    GM237254Courtesy of GENERAL MOTORS CORP.
  9. Remove the lube oil pipe bolt (6) and retainer (7).
  10. Remove the lube oil pipe (5).
  11. Remove the bolts and remove the manual shaft detent spring (3).
    IMPORTANT: Keep the control valve body level when lowering it from the vehicle. This will prevent the loss of checkballs located in the 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)
    • The control valve assembly to the spacer plate gasket
    • The spacer plate
    15. Fig 5: Manual Valve & Valve Body
    GM237271Courtesy of GENERAL MOTORS CORP.
  15. Remove the manual valve (1) from the control valve body.
  16. Inspect the manual valve for nicks and burrs.
    17. Fig 6: Removing Spacer Plate To Case Gasket From The Case
    GM237276Courtesy of GENERAL MOTORS CORP.
  17. Remove the spacer plate to case gasket (2) from the case. The gasket may stick to the spacer plate.
  18. Remove the PWM screen (1) from the case passage.
    19. Fig 7: Manual 2-1 Band Servo Piston & Cushion Spring
    GM477872Courtesy of GENERAL MOTORS CORP.
  19. Remove the manual 2-1 band servo assembly (1).
  20. Remove the servo piston cushion spring (2).
    21. Fig 8: Manual 2-1 Band Servo Piston Assembly
    GM477871Courtesy of GENERAL MOTORS CORP.
  21. Remove the manual 2-1 band servo piston pin retainer ring (4).
  22. Remove the manual 2-1 band servo piston pin (1).
  23. Remove the manual 2-1 band servo piston seal (2).
    24. Fig 9: Removing Checkballs
    GM764950Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: 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).
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