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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 601 (Transfer Case - NVG 136-NP4 (One Speed Automatic)) >> Repair Instructions >> Cleaning and Inspection (Clutch Pack Adjustment) >> Clutch Pack Shimming Procedure

Clutch Pack Shimming Procedure

WARNING: This page is about a different car, the 2001 Oldsmobile Bravada, 2001 GMC Safari, and 2001 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required 

J 44295  Clutch Pack Shimming Kit

NOTE: A clutch plate shim package is necessary in order to have the proper shims available for setting the correct clutch pack preload. Improper preload can cause driveability concerns and failure of the transfer case.
  1. Securely install the base plate (3) of the J 44295  in a vise with the machined surface of the locating tabs facing up.
    Fig 1: Checking Clutch Pack Preload
    G01683745
  2. Install the assembled mainshaft with the drum, the inner clutch plates, and the outer separator plates on the base plate (3) of the J 44295. 
  3. Install the weight (1) of the J 44295  on top of the assembled clutch plates.
  4. Place the gauge block (2) of the J 44295  on one of the locating tabs of the base plate (3) of the J 44295. 
  5. Using a feeler gauge measure between the gauge block (2) and the weight (1) of the J 44295. 
  6. Measure with the gauge block (2) and the feeler gauge on the remaining two locating tabs of the base plate (3).
  7. Take the average of the three measurements and this is the required shim thickness.

    Important:  Measure the clutch shims in the center area of the shim. The shims may have a burr or ridge around the inner or outer edge causing an incorrect measurement. The available shims may not combine to the desired measurement.

  8. Select from the clutch plate shim package the correct shim(s) plus or minus 0.10 mm (0.004 in). You may use a combination of two shims to obtain the correct thickness.

    The shims in the clutch plate shim package are the following thickness:

    • 0.30 mm (0.12 in)
    • 0.56 mm (0.022 in)
    • 0.81 mm (0.032 in)
    • 1.04 mm (0.041 in)
    • 1.30 mm (0.051 in)
    • 1.55 mm (0.061 in)
    • 1.80 mm (0.071 in)
    • 2.08 mm (0.081 in)
  9. Remove the weight (1) of the J 44295. 

    Important:  After obtaining the desired thickness of shims do not remove the clutch plates from the drum. Removing and then reinstalling the clutch plates could change the measurement.

  10. Install the shim(s) and complete the assembly of the mainshaft.
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