GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Avalanche - 4WD 🢒 Driveline/Axle 🢒 Propeller Shaft 🢒 Case Extension Assembly Replacement

Removal Procedure

    Object Number: 747478 Size: SH
  1. Support the transmission with a transmission jack.
  2. Place a drain pan under the vehicle.
  3. Remove the propeller shaft. Refer to Rear Propeller Shaft Replacement .
  4. Remove the transmission mount. Refer to Transmission Mount Replacement .
  5. Remove the case extension bolts (3).
  6. Remove the case extension (1).
  7. Remove and discard the case extension O-ring seal (2).

Installation Procedure

    Object Number: 747478 Size: SH
  1. Install a NEW O-ring seal (2) to the case extension.
  2. Install the case extension (1).

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the case extension bolts (3).

    4. Tighten
    Tighten the bolts to 34 N·m (25 lb ft).

  4. Install the transmission mount. Refer to Transmission Mount Replacement .
  5. Install the propeller shaft. Refer to Rear Propeller Shaft Replacement .
  6. Remove the drain pan and the transmission jack.
  7. Fill the transmission to the proper level with DEXRON® VI transmission fluid. Refer to Transmission Fluid Check .