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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1739 (Automatic Transmission - ALLISON - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> 3rd, 5th and Reverse Clutch Plate Inspection

3rd, 5th and Reverse Clutch Plate Inspection

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Measuring Clutch Oil Groove Depth & Fiber Plate Thickness
    GM1217166Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Make the following measurements at 3 or more locations. Replace any parts not meeting specifications.
  1. Measure the thickness of each 3rd, 5th, and reverse clutch fiber plate (1) at dimension A.

    Specification:  The 3rd, 5th, and reverse clutch fiber plate minimum thickness is 2.375 mm (0.093 in).

  2. Measure the oil groove depth of each 3rd, 5th, and reverse clutch fiber plate at dimension B.

    Specification:  The 3rd, 5th, and reverse clutch fiber plate minimum groove depth is 0.200 mm (0.0079 in).

    3. Fig 2: Measuring Cone Of Clutch Fiber Plate
    GM1217168Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Check the plates for coning on a level surface.
  3. Measure the cone of each 3rd, 5th, and reverse clutch fiber plate (1).

    Specification:  The 3rd, 5th, and reverse clutch fiber plate maximum cone is 0.225 mm (0.0089 in).

    4. Fig 3: Measuring Thickness Of Clutch Steel Plate
    GM1217179Courtesy of GENERAL MOTORS CORP.
  4. Measure the thickness of each 3rd, 5th, and reverse clutch steel plate (1) at dimension A.

    Specification:  The 3rd, 5th, and reverse clutch steel plate minimum thickness is 2.440 mm (0.096 in).

    5. Fig 4: Measuring Cone Of Clutch Steel Plate
    GM1217181Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Check the plates for coning on a level surface.
  5. Measure the cone of each 3rd, 5th, and reverse clutch steel plate (1) at dimension A.

    Specification:  The 3rd, 5th, and reverse clutch steel plate maximum cone is 0.400 mm (0.015 in).

    6. Fig 5: Measuring Thickness Of Clutch Spring Plate
    GM1660859Courtesy of GENERAL MOTORS CORP.
  6. Measure the thickness of the 3rd, 5th, and reverse clutch spring plate (1) at dimension A.

    Specification:  The 3rd, 5th, and reverse clutch spring plate minimum thickness is 3.110 mm (0.1224 in).

    7. Fig 6: Measuring Cone Of Clutch Spring Plate
    GM1217711Courtesy of GENERAL MOTORS CORP.
  7. Measure the cone of the 3rd, 5th, and reverse clutch spring plate (1) at dimension A.

    Specification:  The 3rd, 5th, and reverse clutch spring plate maximum cone is 0.400 mm (0.0157 in).

    8. Fig 7: Measuring Thickness Of Clutch Backing Plate
    GM1217226Courtesy of GENERAL MOTORS CORP.
  8. Measure the thickness of the 3rd, 5th, and reverse clutch backing plate (1) at dimension C.

    Specification:  The 3rd, 5th, and reverse clutch backing plate minimum thickness is 15.325 mm (0.6033 in).

  9. Measure the distance from the top of the thrust plate (2) to the bottom of the 3rd, 5th, and reverse clutch plate inner rim at dimension A.
  10. Measure the thickness of the 3rd, 5th, and reverse clutch plate inner rim at dimension B.
  11. Calculate the thickness of the thrust plate by subtracting Dimension B from Dimension A.

    Specification:  The thrust plate minimum thickness is 3.000 mm (0.1181 in).

    12. IMPORTANT: Check the plates for coning on a level surface.
  12. Measure the cone of the 3rd, 5th, and reverse clutch backing plate (1).
  13. Replace the backing plate if any cone is present.
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