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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 999 (Automatic Transmission - ALLISON (Introduction, Service & Replacement)) >> Repair Instructions >> Control Valve Body 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. Disconnect the external wiring harness from the transmission main connector. Use J 44257  , if the connector is not easily accessible.
    CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
    Fig 1: Disconnecting The External Wiring Harness From The Transmission Main Connector
    GM659284Courtesy of GENERAL MOTORS CORP.
  2. Remove the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement .
    3. IMPORTANT: The transmission main connector is actually one end of the internal harness that protrudes through the transmission case.
    Fig 2: Placing 30 mm 12-Point Deep Socket Or Box-End Over The Connector
    GM659022Courtesy of GENERAL MOTORS CORP.
  3. Place a 30 mm (1 3/16 in) 12-point deep socket or box-end (2) over the connector (1).
  4. Push inward on the socket or wrench to release the retainer feet that attach the connector (1) to the transmission case.
  5. Remove the wrench. Push inward on the electrical connector to separate it from the transmission case. This allows the internal wiring harness to remain with the control valve assembly when removed.
    6. Fig 3: Removing The Detent Spring Assembly
    GM1364398Courtesy of GENERAL MOTORS CORP.
  6. Remove the 2 detent spring bolts (3). Remove the detent spring assembly (2).
    7. IMPORTANT: As the control valve assembly is removed, be careful not to lose the manual selector valve pin or allow the manual selector valve to slide out of the control valve assembly.
    Fig 4: Valve Body Bolt Locations
    GM1357911Courtesy of GENERAL MOTORS CORP.
  7. Remove 11 bolts at locations marked (1) and 4 bolts at locations marked (2). Support the control valve assembly, about 10 pounds, and remove the last bolt marked (1).
    8. Fig 5: Lowering The Control Valve Assemblyto Clear The Locating Pins In The Transmission Case
    GM1364401Courtesy of GENERAL MOTORS CORP.
  8. Lower the control valve assembly (1) to clear the locating pins (2) in the transmission case.
    9. Fig 6: Moving Control Valve Assembly Sideways To Disengage Pin In The Manual Selector Valve From The Slot In Detent Lever
    GM658985Courtesy of GENERAL MOTORS CORP.
  9. Move the control valve assembly (4) sideways to disengage pin (1) in the manual selector valve (2) from the slot in detent lever (3). Remove the control valve assembly (4).
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