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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1626 (Automatic Transmission - 4L80-E - Service & Replacement) >> Repair Instructions >> Valve Body and Pressure Switch Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure that removal of the valve body is necessary before proceeding.
    IMPORTANT: The following components can be serviced without removing the valve body:
    • 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.
  3. Remove the transmission filter. Refer to Automatic Transmission Fluid/Filter Replacement   . 
    4. Fig 1: Removing Transmission Fluid Temperature Sensor & Components
    G01952419Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the internal wire harness from the transmission fluid pressure (TFP) manual valve position switch.
    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. Remove the valve body bolts (1) that retain the (TFP) manual valve position switch (2).
  6. Remove the TFP manual valve position switch.
  7. Disconnect the internal wiring harness electrical connectors from the remaining valve body electrical components.
    Fig 2: Valve Body Bolts & Manual Valve Position Switch
    G01952420Courtesy of GENERAL MOTORS CORP.
  8. Remove the lube oil pipe bolt (6) and retainer (7).
  9. Remove the lube oil pipe (5).
  10. Remove the manual shaft detent spring bolt and 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 valve body passages.
  11. Remove the remaining valve body bolts.
  12. Carefully lower the valve body from the transmission. Use care not to drop the manual shaft valve.
  13. Remove the valve body (2) which includes the following:
    • The accumulator housing (1)
    • The valve body to the spacer plate gasket
    • The spacer plate
      Fig 3: Removing Valve Body
      G01952421Courtesy of GENERAL MOTORS CORP.
  14. Remove the manual valve (1) from the valve body.
  15. Inspect the manual valve for nicks and burrs.
    Fig 4: Removing Manual Valve From Valve Body
    G01952422Courtesy of GENERAL MOTORS CORP.
  16. Remove the spacer plate to case gasket (2) from the case. The gasket may stick to the spacer plate.
  17. Remove the PWM screen (1) from the case passage.
    Fig 5: Removing PWM Screen
    G01952423Courtesy of GENERAL MOTORS CORP.
  18. Remove the manual 2-1 band servo (1).
  19. Remove the servo piston cushion spring (2).
    Fig 6: Removing Manual 2-1 Band Servo & Piston Cushion Spring
    G01952424Courtesy of GENERAL MOTORS CORP.
  20. Remove the manual 2-1 band servo piston pin retainer ring (4).
  21. Remove the manual 2-1 band servo piston pin (1).
  22. Remove the manual 2-1 band servo piston seal (2).
    Fig 7: Manual 2-1 Band Servo Piston Pin Retainer Ring, Pin & Seal
    G01952425Courtesy 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.
  23. Remove the eight checkballs (nine checkballs for some models).
    Fig 8: Removing Eight Checkballs
    G01952426Courtesy of GENERAL MOTORS CORP.
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