GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Silverado - 4WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Automatic Transmission Flex Plate Installation

    Object Number: 1658140 Size: SH

    Important: The flex plate 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 flex plate bolts. This procedure requires a 3 stage tightening process.

  1. Install the flex plate to the crankshaft.
  2. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the flex plate bolts.

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


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

    4. Tighten

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