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Inspection 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. Raise and support the vehicle. On vehicles with solid axles, ensure that the drive axle is supported at ride height-vehicle body supported by suspension components. Ensure the wheels are free to rotate. Refer to Lifting and Jacking the Vehicle .
  2. Place the transmission in NEUTRAL.
  3. Clean any corrosion or foreign material from the U-joint bearing caps.
  4. Remove any of the U-joint bearing cap snap rings that may interfere with the correct placement of the J-23498-A:  Driveshaft Inclinometer or equivalent.
    5. Fig 1: Inspecting Rear Propeller Shaft For Proper Phasing
    GM182325Courtesy of GENERAL MOTORS CORP.
  5. Inspect the prop shaft for proper phasing.
    1. Rotate the prop shaft or shafts to align the shaft yoke flanges vertically.
    2. Install the J-23498-A:  Driveshaft Inclinometer or equivalent to the lower U-joint bearing cap of the rear U-joint of the shaft. The J-23498-A:  Driveshaft Inclinometer or equivalent should be aligned perpendicular to the propeller shaft.
    3. Set the indicator line on the J-23498-A:  Driveshaft Inclinometer or equivalent to 15, the horizontal reference.
    4. Rotate the propeller shaft slightly to center the bubble to the indicator. The U-joint is now vertical.
    5. Without disturbing the setting on the J-23498-A:  Driveshaft Inclinometer or equivalent, remove the J-23498-A:  Driveshaft Inclinometer or equivalent from the rear U-joint bearing cap.
    6. Install the J-23498-A:  Driveshaft Inclinometer or equivalent to the lower U-joint bearing cap of the front U-joint of the same shaft.
    7. Observe and record the reading of the front U-joint with the J-23498-A:  Driveshaft Inclinometer or equivalent still set to 15, the horizontal reference.
  6. For prop systems with 3 U-joints, rotate the shafts 1/4 turn and repeat steps 5.1-5.7 for the other prop shaft.
  7. If the difference between the front and rear U-joints of a welded yoke propeller shaft is 3 degrees or less, the propeller shaft is properly phased.
  8. If the difference between the front and rear U-joints of a welded-yoke propeller shaft is greater than 3 degrees, the propeller shaft is either constructed improperly or damaged from twisting. Refer to Propeller Shaft Phasing Correction .
  9. If the difference between the welded yoke and slip yoke of a propeller shaft is 1.5 degrees or less, the prop shaft is properly phased.
  10. If the difference between the welded yoke and slip yoke of a propeller shaft is greater than 1.5 degrees, the propeller shaft is either constructed improperly or damaged from twisting. Refer to Propeller Shaft Phasing Correction .
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