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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1007 (Automatic Transmission - 4L80-E/4L85-E (Introduction, Service & Replacement)) >> Repair Instructions >> Valve Body and Pressure Switch Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 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)
    Fig 1: Valve Body Electrical Components And Wiring Harness
    GM730165Courtesy of GENERAL MOTORS CORP.
  2. Remove the fluid level indicator.
  3. Remove the transmission filter. Refer to Automatic Transmission Fluid/Filter Replacement .
  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).
    Fig 2: Removing TFP Manual Valve Position Switch
    GM237246Courtesy of GENERAL MOTORS CORP.
  6. Remove the TFP manual valve position switch.
  7. Disconnect the internal wiring harness electrical connectors from the remaining valve body electrical components.
    8. Fig 3: Lube Oil Pipe Assembly
    GM237254Courtesy 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
  14. Remove the manual valve (1) from the valve body.
    Fig 4: Removing The Manual Valve From The Valve Body
    GM237271Courtesy of GENERAL MOTORS CORP.
  15. Inspect the manual valve for nicks and burrs.
    16. Fig 5: Removing Spacer Plate To Case Gasket From The Case
    GM237276Courtesy 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.
    18. Fig 6: Removing Manual 2-1 Band Servo
    GM477872Courtesy of GENERAL MOTORS CORP.
  18. Remove the manual 2-1 band servo (1).
  19. Remove the servo piston cushion spring (2).
    20. Fig 7: Manual 2-1 Band Servo Piston Assembly
    GM477871Courtesy 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).
    23. 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.
    Fig 8: Removing The 8 Checkballs (9 For Some Models)
    GM764950Courtesy of GENERAL MOTORS CORP.
  23. Remove the 8 checkballs (9 for some models).
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