Silverado 2008

Flywheel/Flexplate

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Removal & Installation



The ring gear is an integral part of the flywheel/flexplate and is not replaceable.

  1. Before servicing the vehicle, refer to the Precautions Section.
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  3. Disconnect the negative battery cable.
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  5. Raise and support the vehicle safely.
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  7. Remove the transmission.
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  9. Remove the bolts attaching the flywheel/flexplate to the crankshaft flange, then remove it from the crankshaft.
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  11. If installing a new flywheel on the 4.3L engine equipped vehicles, be sure to position the old weights on the new flywheel.
    NOTE
    Flywheel weights of the same length must be installed into the new flywheel in the same location as the old weights. A properly installed flywheel weight will be flush or slightly below flush with the face of the flywheel.



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    Fig. Flywheel weight locations-4.3L engines



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    Fig. Flywheel and/or flexplate and related components-4.3L engines



    Click image to see an enlarged view

    Fig. Flywheel and related components-4.8L, 5.3L & 6.0L engines

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To install:

  1. Inspect the flywheel/flexplate for cracks, and inspect the ring gear for burrs or worn teeth. Replace the flywheel if any damage is apparent. Remove burrs with a mill file.
  2.  
  3. If equipped with a spacer between the crankshaft and flywheel/flexplate, reinstall the spacer.

    Click image to see an enlarged view

    Fig. Flywheel/flexplate tightening sequence pattern-4.3L, 4.8L, 5.3L, 6.0L engines

  4.  
  5. Install the flywheel/flexplate. The flywheel/flexplate will only attach to the crankshaft in one position, as the bolt holes are unevenly spaced. Install the bolts and tighten in a criss-cross pattern. Tighten to specification.
    NOTE
    The 4.8L, 5.3L, 6.0L engines do 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 bolts. This application requires a three stage tightening process. Some 6.0L engines require a spacer and longer bolts for proper positioning.

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