LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1035 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> On-Vehicle Repair Information >> Control Valve Body Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Transmission Rear Electrical Connector
    GM659284Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to BATTERY DISCONNECT CAUTION .
  1. Disconnect the external wiring harness from the transmission main connector. Use J 44257  if the connector is not easily accessible.
  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 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: Detent Spring Assembly
    GM1633286Courtesy of GENERAL MOTORS CORP.
  6. Remove the 2 detent spring bolts (3). Remove the detent spring assembly (2).
  7. Disconnect the internal wiring harness from the detent lever/IMS assembly.
    8. Fig 4: Control Valve Assembly Bolts
    GM1633290Courtesy of GENERAL MOTORS CORP.
    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.
  8. Remove 10 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).
    9. Fig 5: View Of Control Valve Assembly & Locating Pins
    GM1633292Courtesy of GENERAL MOTORS CORP.
  9. Lower the control valve assembly (1) to clear the locating pins (2) in the transmission case.
    10. Fig 6: Moving Control Valve Assembly Sideways To Clear Manual Selector Valve
    GM1633293Courtesy of GENERAL MOTORS CORP.
  10. 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).
scientia non olet · About LEMON Manuals