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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1388 (Front Drive Axle) >> Repair Instructions >> Inner Axle Shaft Shim Adjustment >> Adjustment Procedure

Adjustment Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the inner axle bearing and the inner axle seal, if necessary. Refer to Front Drive Axle Inner Shaft Seal and Inner Shaft Bearing Replacement .
    2. Fig 1: Identifying Front Drive Axle Components (9.25 Inch)
    GM694347Courtesy of GENERAL MOTORS CORP.
  2. Install the following components into the inner axle shaft housing:
    1. Install the inner axle shaft (1) into the inner axle shaft housing (4).
    2. Install the thrust washer (with tabs) (5).

      Ensure the tabs on the thrust washer are aligned with the slots in the inner shaft housing.

    3. Install the thrust washer (without tabs) (6).
    4. Install the retaining ring (7) into the inner axle shaft (1).
  3. Install the inner axle shaft housing into a vise. Clamp only on the mounting flange of the inner axle shaft housing.
    4. NOTE: In order to obtain an accurate measurement, the inner axle shaft must be moved outwards before measuring.
  4. Push on the inner end of the inner axle shaft and move the shaft outboard as far as it will go.
    5. Fig 2: Using J 34672 To Measure Inner Axle Shaft Distance
    GM1656422Courtesy of GENERAL MOTORS CORP.
  5. Install the J 34673  (1) and the J 34672  (2) onto the inner shaft housing as shown. See Special Tools .
  6. Using the J 34672  , measure the distance from the edge of the inner axle shaft to the surface of the J 34673  . See Special Tools . Ensure the base of the J 34672  is flat against the inner axle shaft.
    7. Fig 3: Measuring Differential Carrier Housing Machined Surface To Front Drive Axle Clutch Shaft Outer Surface
    GM674843Courtesy of GENERAL MOTORS CORP.
  7. Using the J 34672  , measure the distance from the machined surface of the differential carrier housing to the outer surface of the front drive axle clutch shaft. See Special Tools .
  8. Subtract the measurement obtained in step 6 from the measurement obtained in step 7.

    This measurement is the distance between the inner axle shaft and the clutch shaft before subtracting the J 34673  . See Special Tools .

  9. Using a micrometer, measure the thickness of the J 34673  . See Special Tools .
  10. Subtract the thickness of the J 34673  , measured in step 9, from the measurement determined in step 8. See Special Tools .

    This is the shim thickness for the front axle without having any axle shaft endplay.

  11. The correct shim size will be one size smaller than the figure obtained in the previous step.

    Note the following examples:

    • If the figure obtained in step 8 was 3.53 mm (0.139 in), use a 3.30 mm (0.130 in) shim.
    • If the figure obtained in step 8 was 3.30 mm (0.130 in), use a 3.05 mm (0.120 in) shim.
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