GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2008 🢒 H3 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Automatic Transmission Flex Plate Replacement

Removal Procedure

    Object Number: 178458 Size: SH
  1. Remove the transmission. Refer to Transmission Replacement .

    2. Important: Note the position and direction of the engine flywheel before removal.

  2. Remove the engine flywheel bolts.
  3. Remove the engine flywheel.
  4. Clean and inspect the engine flywheel. Refer to Automatic Transmission Flex Plate Cleaning and Inspection .

Installation Procedure

    Important:  The flywheel does not use a locating pin for alignment and will not initially seat against the crankshaft flange, but will be pulled onto the crankshaft by the engine flywheel bolts. This procedure requires a three stage tightening process.


    Object Number: 178458 Size: SH
  1. Install the engine flywheel to the crankshaft.
  2. Apply threadlock to the threads of the flywheel bolts. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.

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


    Object Number: 63174 Size: SH
  3. Install the engine flywheel bolts.

    4. Tighten

    1. Tighten the bolts a first pass in sequence to 20 N·m (15 lb ft).
    2. Tighten the bolts a second pass in sequence to 50 N·m (37 lb ft).
    3. Tighten the bolts a final pass in sequence to 100 N·m (74 lb ft).
  4. Install the transmission. Refer to Transmission Replacement .