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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 403 (AUTOMATIC TRANSMISSION - ALLISON (INTRODUCTION, SERVICE & REPLACEMENT))REPAIR INSTRUCTIONSCONTROL VALVE BODY DISASSEMBLEDISASSEMBLY PROCEDURE
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Disassembly Procedure

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Disassembly 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.
    NOTE: Refer to Transmission Control Valve Body Overhaul Notice .
  1. Position the control valve module on the work table so that the main valve body module is facing up.
  2. Remove six bolts (1) and one bolt (2) retaining the reverse signal pipe and transmission fluid pressure (TFP) switch to the main valve body.
    Fig 1: Removing Bolts Retaining The Reverse Signal Pipe And Transmission Fluid Pressure (TFP) Switch To The Main Valve Body
    GM1331354Courtesy of GENERAL MOTORS CORP.
    3. Fig 2: Removing Reverse Signal Pipe From Main Valve Body
    GM1331367Courtesy of GENERAL MOTORS CORP.
  3. Remove reverse signal pipe (2) from main valve body (3).
  4. Remove the TFP switch (1) from main valve body (3).
    5. Fig 3: Removing The Modulated Main Pressure Solenoid G Valve Body Assembly
    GM1332352Courtesy of GENERAL MOTORS CORP.
  5. Remove the 2 bolts (1) retaining the modulated main pressure solenoid G valve body (2).
  6. Remove the modulated main pressure solenoid G valve body assembly (2).
  7. Remove the modulated main pressure solenoid G retainer (5) from the bottom of the valve body (2).
  8. Remove the modulated main pressure solenoid G (6).
  9. Remove the 2 O-rings (3 and 4) from the modulated main pressure solenoid G (6).
    10. Fig 4: Removing The TCC PWM Solenoid Assembly
    GM1331372Courtesy of GENERAL MOTORS CORP.
  10. Remove the torque converter clutch pulse width modulated (TCC PWM) solenoid retainer (1).
  11. Remove the TCC PWM solenoid (7), sleeve (4), valve (3), and spring (2).
  12. Remove O-rings (5) and (6) from the TCC PWM solenoid (7).
    13. Fig 5: Removing Shift Solenoid D Assembly
    GM1331377Courtesy of GENERAL MOTORS CORP.
  13. Remove shift solenoid D retainer (1).
  14. Remove shift solenoid D (4).
  15. Remove the O-rings (2 and 3) from shift solenoid D (4).
    16. Fig 6: Removing Shift Solenoid E Assembly
    GM1331380Courtesy of GENERAL MOTORS CORP.
  16. Remove shift solenoid retainer E (1).
  17. Remove shift solenoid E (4).
  18. Remove the O-rings (2) and (3) from shift solenoid E (4).
    19. Fig 7: Removing The 3 Bolts That Retain The Pressure Control Solenoid Retaining Bracket
    GM1331541Courtesy of GENERAL MOTORS CORP.
  19. Remove the 3 bolts (1) that retain the pressure control solenoid retaining bracket (2) to main valve body (3).
  20. Remove the pressure control solenoid retaining bracket (1), 2 accumulator springs (2), and 2 accumulator plugs (3).
  21. Remove pressure control solenoid A (15), valve (13), spring (12), valve (11), and spring (10).
    Fig 8: Removing Pressure Control Solenoid A And B
    GM1331385Courtesy of GENERAL MOTORS CORP.
  22. Remove pressure control solenoid B (9), valve (7), valve (6), and spring (5).
  23. Remove O-ring (14) from pressure control solenoid A (15).
  24. Remove O-ring (8) from pressure control solenoid B (9).
  25. Position the control valve module on the work table so that shift valve body (1) is facing up.
  26. Remove shift solenoid C retainer (2).
    Fig 9: Removing Shift Solenoid C
    GM1331386Courtesy of GENERAL MOTORS CORP.
  27. Remove shift solenoid C (5).
  28. Remove O-rings (3 and 4) from shift solenoid C (5).
    29. Fig 10: Removing Eleven Bolts Retaining The Shift Valve Body And The Main Valve Body Together
    GM1331387Courtesy of GENERAL MOTORS CORP.
  29. Remove eleven bolts (1) retaining the shift valve body and the main valve body together.
  30. Position the control valve module on the work table so that the main valve body is facing up. Reinstall four bolts (1) so that the bolts are partially threaded into the shift valve body and protrude from the main valve body.
  31. Position the control valve module on edge so that the top and bottom are vertical.
  32. Gently tap the bolts until the module separates.
  33. Position the control valve assembly on the work table so that shift valve body (1) is facing up.
  34. Separate shift valve body assembly (1), separator plate (2), and main valve body assembly (4).
    Fig 11: Separating Shift Valve Body Assembly, Separator Plate, And Main Valve Body Assembly
    GM1331397Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.