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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Automatic Transmission - ALLISON - Introduction (2 Of 2)) >> Repair Instructions >> Wiring Harness Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
    CAUTION: Refer to BATTERY DISCONNECT CAUTION in Cautions and Notices.
  1. Remove the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement .
  2. Disconnect the external wiring harness from the main transmission connector. Use J 44257  , if connector is not easily accessible. See Special Tools .
    Fig 1: Disconnecting External Wiring Harness From Transmission Main Connector
    GM659284Courtesy of GENERAL MOTORS CORP.
  3. IMPORTANT: The main transmission connector is actually one end of the internal wiring 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.
  4. Place a 30 mm or 1 3/16 inch 12-point deep socket or box-end wrench (2) over the main transmission connector (1).
  5. Push inward on the socket or wrench to release the retaining feet that attach the connector (1) to the transmission case.
  6. Remove the wrench. Push inward on the electrical connector to separate from the transmission case.
  7. Disconnect the internal wiring harness connectors (1) from the solenoids, the internal mode switch (IMS), and from the transmission fluid pressure (TFP) switch.
    Fig 3: Disconnecting Internal Wiring Harness Connectors
    GM658993Courtesy of GENERAL MOTORS CORP.
  8. IMPORTANT: The solenoid retainers for shift solenoid 3 (SS3) and shift solenoid 2 (SS2) also retain tabs on the wiring harness U-channel. The solenoids will remain in position even after the solenoid retainers are removed.
  9. Remove the solenoid retainers (2) for SS3 and SS2.
  10. Remove the internal wiring harness from the transmission.