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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1355 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Repair Instructions - Off Vehicle >> Control Valve Assembly Removal

Control Valve Assembly Removal

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Manual Shift Shaft Detent Spring
    GM1581029Courtesy of GENERAL MOTORS CORP.
  1. Remove 2 detent spring bolts (1).
  2. Remove the manual shift shaft detent spring (2).
    3. Fig 2: Identifying Control Valve Assembly Bolts
    GM1633290Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Six gold colored bolts retain the modulated main valve body. Four of these bolts assist in retaining the control valve body. The modulated main valve body is removed as part of the control valve assembly disassemble procedure.
  3. Remove 11 control valve body assembly bolts (1).
  4. Remove 4 bolts (2) from the modulated main valve body and control valve body.
    5. Fig 3: Installing Cloth In Park Pawl Apply Assembly Guide Hole
    GM1581032Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Installing a lint-free cloth into the park pawl apply assembly guide hole prevents the manual valve pin from falling into the transmission.
  5. Install a lint-free cloth (1) in the park pawl apply assembly guide hole in the transmission case (2).
    6. Fig 4: Identifying Control Valve Body Assembly
    GM1581033Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not drop the manual valve when removing or installing the control valve body assembly onto or from the transmission case.
    Placing a finger over the end of the manual valve hole when removing the control valve body assembly from the transmission case prevents the manual valve from falling free of the bore.
  6. Lift the control valve body assembly (2) until the 2 locating pins (1) of the control valve body assembly are disengaged from the transmission case.
    7. Fig 5: Identifying Detent Lever/IMS Assembly
    GM1581034Courtesy of GENERAL MOTORS CORP.
  7. Slide the control valve body assembly to the side and disengage the manual valve pin (2) from the manual shift shaft detent lever/IMS assembly (1).
  8. Remove the control valve body assembly from the transmission case.
    9. Fig 6: Identifying Manual Valve & Pin
    GM1581037Courtesy of GENERAL MOTORS CORP.
  9. Remove, as a unit, the manual valve (2) and the manual valve pin (3) from the shift valve body assembly (1).
  10. Remove the manual valve pin (3) from the manual valve (2).
    11. Fig 7: Installation/Removal Of Cloth In Park Pawl Apply Assembly Guide Hole
    GM1358244Courtesy of GENERAL MOTORS CORP.
  11. Remove the lint free cloth (1) from the park pawl apply assembly guide hole in the transmission case (2).
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