CTS 2006-2007, CTS-V 2005-2007, DTS 2006-2007

Axle Unit

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove propeller shaft.
  6.  
  7. Remove the right rear tire and wheel assembly.
  8.  
  9. Remove the right wheel drive shaft.
  10.  
  11. Position a transmission jack beneath the differential.
  12.  
  13. Firmly secure the differential to the transmission jack.

    Click image to see an enlarged view

    Fig. Differential secured to the transmission jack

  14.  
  15. Remove the front differential to support mounting bolt and nut.
  16.  
  17. Remove the left rear differential to support mounting bolt.
    NOTE
    The rear differential support mounting bolts will not be able to be removed completely due to interference with the underbody.

  18.  
  19. Remove the right rear differential to support mounting bolt.
  20.  
  21. Lower the jack slightly until the mounting ear at the front of the differential clears the support attachment point.
  22.  
  23. Using a suitable tool, carefully release the wheel drive shaft from the differential enough to install the J 44394.
    NOTE
    J-44394 must be installed into the differential output shaft seal prior to removing and installing the wheel drive shaft. Failure to install J-44394 as indicated may cause the splines of the wheel drive shaft to cut the differential output seal.

  24.  
  25. Carefully install J 44394 the over the wheel drive shaft.

    Click image to see an enlarged view

    Fig. Carefully sliding the J 44394 into the differential output shaft seal

  26.  
  27. Carefully slide the J 44394 into the differential output shaft seal.
  28.  
  29. Continue lowering the jack, while simultaneously disengaging the left wheel drive shaft.
  30.  
  31. Remove the differential from the vehicle.
  32.  

To install:

  1. When replacing the differential, remove the plastic vent plug and install a new differential vent.
  2.  
  3. If reusing the wheel drive shaft remove and discard the wheel drive shaft retaining ring. The wheel drive shaft retaining ring is on the splined shaft of the inner tripod housing.
  4.  
  5. Install the new wheel drive shaft retaining ring. The wheel drive shaft retaining ring is on the splined shaft of the inner tripod housing.
  6.  
  7. If previously removed carefully install J 44394 into the left differential output shaft seal.
    NOTE
    In order to prevent lubricant leaks, use care when installing the wheel drive shaft to the differential. Do not damage the oil seal. Replace the oil seal if it becomes nicked, distorted, or is otherwise damaged.

  8.  
  9. With the differential firmly attached to the jack, raise the differential while carefully installing the left wheel drive shaft into the differential until the splines are past the J 44394.
  10.  
  11. Carefully remove the J 44394 from the differential.
  12.  
  13. Carefully remove J 44394 from the left wheel drive shaft.
  14.  
  15. Carefully install the wheel drive shaft into the differential until the retaining ring is engaged.
  16.  
  17. Ensure the wheel drive shaft retaining ring is fully engaged to the differential by grasping the inner housing and pulling outward. The wheel drive shaft will stay positively engaged if properly installed to the differential.
  18.  
  19. Install the front differential to support mounting bolt in order to locate the differential to the rear support.
  20.  
  21. Hand install the nut to the bolt.
  22.  
  23. With the differential firmly attached to the jack, raise the differential to the rear support.
  24.  
  25. Position the differential to the support.
  26.  
  27. Hand install the left rear differential to support mounting bolt.
  28.  
  29. Hand install the right rear differential to support mounting bolt.
  30.  
  31. Tighten the rear differential to support mounting bolts to 129 ft. lbs. (175 Nm).
  32.  
  33. Tighten the front differential to support mounting bolt 129 ft. lbs. (175 Nm).
  34.  
  35. Remove the transmission jack.
  36.  
  37. Install propeller shaft.
  38.  
  39. Install the right wheel drive shaft.
  40.  
  41. Install the right rear tire and wheel assembly.
  42.  
  43. Check the fluid level in the rear differential.
  44.  
  45. Lower the vehicle.
  46.  

 
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