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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 >> Output Flange/Yoke Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Place the transmission in the Park (P) selector position.
    2. CAUTION: Apply the parking brake and block the drive wheels before performing this procedure in order to prevent bodily injury.
  2. Apply the parking brake and chock the wheels to prevent vehicle movement.
  3. Remove the vehicle driveline from the transmission yoke assembly (1). Refer to Transmission Replacement (With 6.6L Engine)  or Transmission Replacement (With 8.1L (L18) Engine) .

    Remove the bolt (3) and seal ring washer (2). Remove the yoke assembly (1).

    Fig 1: Removing Yoke Assembly
    GM659007Courtesy of GENERAL MOTORS CORP.
    4. IMPORTANT: Do the following prior to installation of the yoke assembly:
    • Be sure the yoke, output shaft and retaining hardware are clean.
    • Verify the output seal is free of tears or cuts.
    • DO NOT attempt to remove scratches from the output seal journal on the yoke assembly. Repair may produce machine lead and leakage.
  4. Inspect the yoke assembly and replace it whenever there are nicks or scratches on the seal journal or on the lead-in chamfer just ahead of the seal journal.
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