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Home >> Chevrolet >> 2005 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 707 (Automatic Transaxle - 4T80-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Repair Instructions - Off Vehicle >> Control Valve Lower Body Disassemble

Control Valve Lower Body Disassemble

WARNING: This page is about a different car, the 2008 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Internal Mode Switch
    GM1580428Courtesy of GENERAL MOTORS CORP.
  1. Use a small screwdriver in order to disconnect the electrical connectors from the following parts:
    • 1-2 shift solenoid valve (909)
    • 2-3 shift solenoid valve (910)
    • Internal mode switch (IMS) (942)
    2. Fig 2: Accumulator Housing
    GM1580429Courtesy of GENERAL MOTORS CORP.
  2. Remove the 3, 10 mm bolts (534) from the channel plate side.
  3. Remove the 6, 10 mm bolts (534, 951, 952, 954) from the accumulator housing.
    4. IMPORTANT: There are 4 checkballs (65) and a spring (971) under the accumulator housing (944).
  4. Remove the accumulator housing (944) from the channel plate.
    5. Fig 3: Channel Plate
    GM1580432Courtesy of GENERAL MOTORS CORP.
  5. Remove the 4 checkballs (65) and the spring (971) from the channel plate.
    6. Fig 4: Link Assembly & Internal Mode Switch
    GM1580433Courtesy of GENERAL MOTORS CORP.
  6. In order to disconnect the manual valve and link assembly (916) from the internal mode switch (IMS) (942), rotate the manual valve and link assembly (916) toward the IMS (942).
    7. Fig 5: Internal Mode Switch (IMS)
    GM1580437Courtesy of GENERAL MOTORS CORP.
  7. Turn the manual valve link 90 degrees and rotate the manual valve and link assembly (916) away from the IMS (942).
    8. Fig 6: Internal Mode Switch (IMS) Bolt
    GM1580439Courtesy of GENERAL MOTORS CORP.
  8. Remove the 3, 8 mm bolts (939) from the internal mode switch (IMS) (942).
  9. Remove the IMS (942).
    10. Fig 7: Identifying Lower Control Valve Assembly Retaining Bolts
    GM1217566Courtesy of GENERAL MOTORS CORP.
  10. Remove the 15, 10 mm bolts (938, 940, 941) from the lower control valve body.
  11. Remove the solenoid valve fluid filter retainer (981).
  12. Remove the lower control valve assembly (903) from the channel plate.
    13. Fig 8: View Of Channel Plate & Spacer Plate
    GM509660Courtesy of GENERAL MOTORS CORP.
  13. Remove the 4 checkballs (65).
  14. Remove the spacer plate and gasket assembly (935) from the channel plate (900).


    Fig 1: View Of Low/Reverse Servo Components
    GM15460Courtesy of GENERAL MOTORS CORP.
  1. Remove the low/reverse servo piston retaining ring (932).
  2. Push on the low/reverse apply pin (931) to remove the low/reverse servo assembly from the control valve body.
  3. Remove the return spring (901).
  4. Remove the retaining ring (902) from the low/reverse servo assembly and push out the servo pin (931).
  5. Remove the following parts:
    • The servo cushion spring (934)
    • The sleeve (980)
    • The spring washer (933)
  6. Inspect the following items for damage:
    • The low/reverse servo piston (928)
    • The low/reverse servo seals (929, 930)
    7. Fig 2: Identifying Ball Check Capsule
    GM15462Courtesy of GENERAL MOTORS CORP.
  7. Remove the following parts:
    • The spring retainer (904)
    • The ball check capsule (905)
    • The ball (979)
  8. Inspect all parts for scratches, debris, and damage.
    9. Fig 3: Locating 3-4 Shift Valve Assembly
    GM15465Courtesy of GENERAL MOTORS CORP.
  9. Remove the following parts:
    • The retainer clip (308)
    • The bore plug (914)
    • The 3-4 shift valve (912)
    • The 3-4 shift valve spring (911)
  10. Inspect the 3-4 shift valve (912) for scratches or debris.
    11. Fig 4: 1-2 Shift Solenoid Valve
    GM1592025Courtesy of GENERAL MOTORS CORP.
  11. Remove the following parts:
    • The retainer clip (308)
    • The 1-2 shift solenoid valve (909)
    • The 1-2 shift valve B (920)
    • The 1-2 shift valve A (919),
    • The 1-2 shift valve spring (918)
  12. Inspect the 1-2 shift solenoid valve (909) for damage.
  13. Inspect the 1-2 shift valves A and B (919, 920) for scratches or debris.
    14. Fig 5: Solenoid Screen Assembly
    GM1592056Courtesy of GENERAL MOTORS CORP.
  14. Remove the solenoid screen assembly (917).
  15. Inspect the solenoid screen assembly (917) for excessive debris.
    16. Fig 6: 2-3 Shift Solenoid Valve
    GM1592062Courtesy of GENERAL MOTORS CORP.
  16. Remove the following parts:
    • The retainer clip (308)
    • The 2-3 shift solenoid valve (910)
    • The 2-3 shift valve D (908)
    • The 2-3 shift valve C (907)
    • The 2-3 shift valve spring (906)
  17. Inspect the 2-3 shift solenoid valve (910) for damage.
  18. Inspect the 2-3 shift valves C and D (907, 908) for scratches or debris.
    19. Fig 7: Manual Valve & Link
    GM1592064Courtesy of GENERAL MOTORS CORP.
  19. Remove the manual valve link (913) and the manual valve (916).
  20. Inspect the manual valve (916) for scratches or damage.
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