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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 263 (Engine Mechanical - Hybrid (Hp2) 6.0L (LFA)) >> Repair Instructions - On Vehicle >> Automatic Transmission Flex Plate Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: The flywheel does not use a locating pin for alignment and will not initially seat against the crankshaft flange or spacer, if applicable, but will be pulled onto the crankshaft by the engine flywheel bolts. This procedure requires a three stage tightening process.
    Fig 1: Identifying Automatic Transmission Flex Plate & Bolts
    GM1970247Courtesy of GENERAL MOTORS CORP.
  1. Install the flywheel and bolts (1) 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. Fig 2: Identifying Flex Plate Bolt Tightening Sequence
    GM63174Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  4. Tighten the flywheel bolts.

    Tighten: 

    1. Tighten the bolts (1-6) a first pass in sequence to 20 N.m (15 lb ft).
    2. Tighten the bolts (1-6) a second pass in sequence to 50 N.m (37 lb ft).
    3. Tighten the bolts (1-6) a final pass in sequence to 100 N.m (74 lb ft).

  5. Install the automatic transmission. Refer to Transmission Replacement .