GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1217226  Size: SH
  1. Measure the thickness of C3 clutch backplate (1) at dimension C.
  2. C3 Clutch Backplate Thickness
    Minimum thickness is 15.325 mm (0.6033 inch).

  3. On a level surface, measure the C3 backplate for cone.
  4. Replace a backplate if measurable cone is present.