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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Frame And Underbody) >> Repair Instructions >> Rear Suspension Cradle Removal and Installation (Blackwing MHU) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Set the parking brake in Service Mode.
    1. Install a scan tool.
    2. Turn the ignition ON with engine OFF
    3. Select Electronic Brake Control Module.
    4. Select Control Functions.
      5. NOTE:

      Do NOT apply any brake pressure during this step.

    5. Select Rear Brake Caliper Piston Retract.
  2. Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection
  3. Raise and support the vehicle. Lifting and Jacking the Vehicle
  4. GM5395705Courtesy of GENERAL MOTORS COMPANY

    Rear Tire Front Air Deflector Bolt- Left Side and Right Side (1) - Remove [4x]

  5. Rear Tire Front Air Deflector- Left Side and Right Side (2) - Remove [2x]
  6. GM5400553Courtesy of GENERAL MOTORS COMPANY

    Rear Wheelhouse Liner Bolt- Left Side (1) - Remove

  7. Underbody Rear Air Deflector Nut- Left Side (2) - Remove [3x]
  8. Underbody Rear Air Deflector Bolt- Left Side (3) - Remove [3x]
  9. Underbody Rear Air Deflector Nut- Left Side (4) - Remove [2x]
  10. Underbody Rear Air Deflector- Left Side (5) - Remove
  11. GM5400642Courtesy of GENERAL MOTORS COMPANY

    Rear Wheelhouse Liner Bolt- Right Side (1) - Remove

  12. Underbody Rear Air Deflector Bolt- Right Side (2) - Remove [3x]
  13. Underbody Rear Air Deflector Nut- Right Side (3) - Remove [3x]
  14. Underbody Rear Air Deflector Nut- Right Side (4) - Remove [2x]
  15. Underbody Rear Air Deflector- Right Side (5) - Remove
  16. GM5839256Courtesy of GENERAL MOTORS COMPANY

    Underbody Front Air Deflector Bolt- Right Side (1) - Remove [6x]

  17. Underbody Rear Air Deflector Nut- Right Side (2) - Remove [5x]
  18. Transmission Fluid Cooler Pipe Bracket Bolt- Right Side (3) - Remove [2x]
  19. Underbody Rear Air Deflector Bolt- Right Side (4) - Remove [2x]
  20. Underbody Rear Air Deflector- Right Side (5) - Remove
  21. GM5854893Courtesy of GENERAL MOTORS COMPANY

    Underbody Front Air Deflector Bolt- Left Side (1) - Remove [6x]

  22. Underbody Rear Air Deflector Nut- Left Side (2) - Remove [5x]
  23. Transmission Fluid Cooler Pipe Bracket Bolt- Left Side (3) - Remove [2x]
  24. Underbody Rear Air Deflector Bolt- Left Side (4) - Remove [2x]
  25. Underbody Rear Air Deflector- Left Side (5) - Remove
  26. GM5400756Courtesy of GENERAL MOTORS COMPANY

    Floor Panel Number 4 Cross Bar Reinforcement Bolt (1) - Remove [6x]

  27. Floor Panel Reinforcement (2) - Remove
  28. GM5865265Courtesy of GENERAL MOTORS COMPANY

    Catalytic Converter Nut (1) - Remove [2x]

  29. GM5865271Courtesy of GENERAL MOTORS COMPANY

    Exhaust Pipe Clamp (1) - Loosen [2x]

  30. GM5406578Courtesy of GENERAL MOTORS COMPANY

    Exhaust Muffler (1) @ Exhaust Intermediate Pipe Insulator-Left Side (2) - Separate [2x]

  31. GM5406632Courtesy of GENERAL MOTORS COMPANY

    Exhaust Muffler (1) @ Exhaust Intermediate Pipe Insulator-Right Side (2) - Separate [2x]

  32. GM5865287Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (1) - Disconnect

  33. GM5865293Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (1) - Disconnect

  34. GM5865300Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Some components not shown for graphic clarity.

    Exhaust Muffler Hanger Bracket Nut (1) - Remove [4x]

  35. GM5865329Courtesy of GENERAL MOTORS COMPANY

    With the aid of an assistant, remove the exhaust muffler (1).

  36. Catalytic Converter Gasket (2) - Remove and DISCARD
  37. GM5865888Courtesy of GENERAL MOTORS COMPANY

    Exhaust Heat Shield Bolt (2) - Remove [2x]

  38. Exhaust Intermediate Underbody Heat Shield (3) - Remove
  39. GM5334717Courtesy of GENERAL MOTORS COMPANY

    Floor Panel Number 2 Cross Bar Reinforcement Bolt (1) - Remove [4x]

  40. Floor Panel Number 2 Cross Bar Reinforcement (2) - Remove
  41. Using a suitable jack stand, support the rear of the transmission.
  42. GM5867370Courtesy of GENERAL MOTORS COMPANY

    Transmission Mount Bracket Bolt (1) - Remove [4x]

  43. GM5867371Courtesy of GENERAL MOTORS COMPANY

    Transmission Mount Bolt (1) - Remove [2x]

  44. Transmission Mount (2) - Remove
  45. GM5863694Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Before removing the propeller shaft from the vehicle, paint or scribe references marks on the transmission flange to the propeller shaft and the rear differential drive flange to ensure minimal driveline system imbalance.

    Mark (2) the relationship of the propeller shaft flange (3) and the output flange (1) of the transmission.

  46. GM5863695Courtesy of GENERAL MOTORS COMPANY

    Mark (3) the relationship of the propeller shaft flange (1) and the rear axle pinion flange (2).

  47. GM5863696Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure that the propeller shaft is secured to the jack stand.

    Support the propeller shaft with a suitable jack stand.

  48. Remove the 3 front propeller shaft bolts (2) and the front propeller shaft nuts (1).
  49. GM5863697Courtesy of GENERAL MOTORS COMPANY

    Remove the 3 rear propeller shaft bolts (1) and the 3 rear propeller shaft nuts (2).

  50. GM5863691Courtesy of GENERAL MOTORS COMPANY

    Remove the 2 propeller shaft bearing support bolts (1).

  51. GM5863853Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Care should be taken not to use sharp or pry tools when separating the propeller shaft coupler from the drive flange. Damage to the coupler could result and replacement of the entire propeller shaft would be required.

    NOTE:

    It may be necessary to apply a small amount of penetrating lubricant or WD-40® to the area shown (1) to aid in separation of the propeller shaft coupling.

    If the propeller shaft does not easily separate from the differential, or transmission, use a rubber mallet to gently tap the locations (1) on the rubber coupling shown above to separate.

  52. GM5863854Courtesy of GENERAL MOTORS COMPANY

    Remove the propeller shaft (1) from the vehicle.

  53. Place a drain pan under the vehicle.
  54. GM5864749Courtesy of GENERAL MOTORS COMPANY

    Transmission Fluid Cooler Pipe Clip (1) - Remove [2x]

  55. Retaining Clip (3) - Disengage
  56. Transmission Fluid Auxiliary Cooler Outlet Pipe (2) @ Transmission Fluid Cooler Pipe - Remove
  57. GM5865268Courtesy of GENERAL MOTORS COMPANY

    Transmission Fluid Cooler Pipe Clip (1) - Remove [2x]

  58. Retaining Clip (3) - Disengage
  59. Transmission Fluid Auxiliary Cooler Inlet Pipe (2) @ Transmission Fluid Cooler Pipe - Remove
  60. Remove the rear tire and wheel assemblies. Tire and Wheel Removal and Installation
  61. GM5877737Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Disconnect the left and right side parking brake actuator electrical connector.

  62. Parking Brake Bolt- Left Side and Right Side (1) - Remove [4x]
  63. Parking Brake Caliper- Left Side and Right Side (2) - Remove [2x]
  64. GM5876657Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Left side shown, right side similar.
    • Do NOT disconnect the hydraulic brake flexible hose from the caliper.
    CAUTION:

    Support the brake caliper with heavy mechanic wire, or equivalent, whenever it is separated from its mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak.

    Rear Brake Caliper Bracket Bolt- Left Side and Right Side (2) - Remove [4x]

  65. Rear Brake Caliper- Left Side and Right Side (1) - Remove [2x]
  66. Position the left and right rear brake calipers (1) out of the way and support with heavy mechanics wire.
  67. GM5334525Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Remove the 8 rear spring pins (1) from the left and right side rear suspension lower control arms.

  68. Rear Suspension Lower Control Arm Cover- Left Side and Right Side (2) - Remove [2x]
  69. GM5335007Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Place a jack under the left and right rear suspension lower control arms.

  70. Rear Shock Absorber Bolt- Left Side and Right Side (2) @ Rear Suspension Lower Control Arm (3) - Remove and DISCARD [2x]
  71. Mark rear coil springs for proper installation.
  72. GM5337541Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Suspension Lower Control Arm Outer Nut- Left Side and Right Side (1) - Remove [2x]

  73. Using the jack stand, raise the rear lower control arms enough to aid in the removal of the of the rear suspension lower control arm outer bolts.
  74. Rear Suspension Lower Control Arm Outer Bolt- Left Side and Right Side (3) - Remove and DISCARD [2x]
  75. GM5504134Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Suspension Lower Control Arm Inner Nut- Left Side and Right Side (1) - Loosen [2x]

  76. GM5504136Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Left side shown, right side similar.
    • Observe the orientation of rear coil spring (1) as it will be dislodged upon removal of the rear suspension lower control arm.

    Slowly raise the vehicle to release tension on the rear coil spring (1) and swing the rear suspension lower control arm (2) far enough to gain access to the rear coil spring (1) for removal.

  77. GM5504137Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Suspension Lower Control Arm Inner Nut- Left Side and Right Side (1) - Remove [2x]

  78. Rear Suspension Lower Control Arm Inner Washer- Left Side and Right Side (2) - Remove [2x]
  79. Rear Suspension Lower Control Arm Inner Bolt- Left Side and Right Side (3) - Remove and DISCARD [2x]
  80. GM5504138Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Suspension Lower Control Arm- Left Side and Right Side (1) - Remove [2x]

  81. GM5590590Courtesy of GENERAL MOTORS COMPANY

    Using a suitable jack stand (1), support the rear differential carrier.

  82. GM5590838Courtesy of GENERAL MOTORS COMPANY

    Position a block of wood (1) and a suitable jack stand (2) between the frame of the vehicle and the rear suspension bracket on the left side.

  83. GM5591038Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    DO NOT raise the vehicle higher than necessary.

    Using the block of wood and a suitable jack stand (1), raise the vehicle just enough to reposition the hoist pad (2) from under the vehicle.

  84. GM5442507Courtesy of GENERAL MOTORS COMPANY

    Rear Suspension Bracket Bolt- Left Side (1) - Remove

  85. Rear Suspension Bracket Bolt- Left Side (4) - Remove
  86. Rear Suspension Cradle Front Bolt- Left Side (3) - Remove
  87. Rear Suspension Bracket- Front- Left Side (2) - Remove

    DO NOT ATTEMPT OTHER REPAIRS WITH JACK STANDS IN PLACE.

  88. GM5892694Courtesy of GENERAL MOTORS COMPANY

    Reinstall the left side rear suspension cradle front bolt (1).

  89. Position the hoist pad back onto body flange between the rear suspension bracket fastener holes, lower the vehicle onto the hoist and remove the jack stand.
  90. GM5590838Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Position the block of wood (1) and the suitable jack stand (2) between the frame of the vehicle and the rear suspension bracket on the right side.

  91. GM5591038Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Left side shown, right side similar.
    • DO NOT raise the vehicle higher than necessary.

    Using the block of wood and a suitable jack stand (1), raise the vehicle just enough to reposition the hoist pad (2) from under the vehicle.

  92. GM5442507Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Suspension Bracket Bolt- Right Side (1) - Remove\

  93. Rear Suspension Bracket Bolt- Right Side (4) - Remove
  94. Rear Suspension Cradle Front Bolt- Right Side (3) - Remove
  95. Rear Suspension Bracket- Front- Right Side (2) - Remove

    DO NOT ATTEMPT OTHER REPAIRS WITH JACK STANDS IN PLACE.

  96. GM5892721Courtesy of GENERAL MOTORS COMPANY

    Reinstall the right side rear suspension cradle front bolt (1).

  97. Position the hoist pad back onto body flange between the rear suspension bracket fastener holes, lower the vehicle onto the hoist and remove the jack stand.
  98. GM5590590Courtesy of GENERAL MOTORS COMPANY

    Remove the jack stand (1), from the rear differential carrier.

  99. GM5336324Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Suspension Bracket Nut- Left Side and Right Side (1) - Remove [4x]

  100. Rear Suspension Bracket- Left Side and Right Side (2) - Remove [2x]
  101. GM5881258Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Some components not shown for graphic clarity.

    Disconnect the 2 body wiring harness electrical connectors (1) from the chassis wiring harness electrical connectors.

  102. GM5881284Courtesy of GENERAL MOTORS COMPANY

    Remove the chassis wiring harness channel (2) from the 2 body studs.

  103. Remove the chassis wiring harness retainer (1) from the underbody air front deflector stud.
  104. Position a lift table under rear suspension cradle.
  105. GM5883914Courtesy of GENERAL MOTORS COMPANY

    Remove the 2 rear suspension cradle front bolts (1) on the left and right side.

  106. GM5880932Courtesy of GENERAL MOTORS COMPANY

    Rear Suspension Cradle Rear Bolt- Left Side and Right Side (1) - Remove and DISCARD [2x]

  107. GM5880986Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Remove the cradle with the suspension links and components attached as shown.

    Rear Suspension Cradle (1) - Remove

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