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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Frame And Underbody) >> Repair Instructions >> Rear Suspension Cradle Removal and Installation (Blackwing MHU) >> Installation Procedure

Installation 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. GM5880986Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure that the rear suspension cradle is securely attached to the jack/support stand.

    Rear Suspension Cradle (1) - Install

  2. GM5893422Courtesy of GENERAL MOTORS COMPANY

    Install the 2 CH-51034 - A  Cradle Alignment Pins (1) to align the rear cradle to the body.

  3. GM5880932Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Torque-to-Yield Fastener Caution .

    Rear Suspension Cradle Rear Bolt (1) - Install NEW and tighten [2x] - Fastener Specifications 

  4. GM5883914Courtesy of GENERAL MOTORS COMPANY

    Temporarily install the 2 OLD rear cradle front bolts.

  5. Remove the 2 CH-51034 - A  Cradle Alignment Pins (1) from the rear cradle.
  6. Remove the lift table from under the rear suspension cradle.
  7. GM5336324Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Suspension Bracket- Left Side and Right Side (2) - Install [2x]

    8. CAUTION:

    Refer to Fastener Caution .

  8. Rear Suspension Bracket Nut- Left Side and Right Side (1) - Install and tighten [4x] - Fastener Specifications
  9. GM5881284Courtesy of GENERAL MOTORS COMPANY

    Install the chassis wiring harness retainer (1) to the underbody air front deflector stud.

  10. Install the chassis wiring harness channel (2) to the 2 body studs.
  11. GM5881258Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Some components not shown for graphic clarity.

    Connect the 2 body wiring harness electrical connectors (1) to the chassis wiring harness electrical connectors.

  12. GM5590590Courtesy of GENERAL MOTORS COMPANY

    Place the jack stand (1) under the rear differential carrier for support.

  13. 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.

  14. 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 the suitable jack stand (1), raise the vehicle just enough to reposition the hoist pad (2) from under the vehicle.

  15. GM5892738Courtesy of GENERAL MOTORS COMPANY

    Rear Suspension Cradle Front Bolt- Right Side (1) - Remove and DISCARD

  16. GM5442507Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Suspension Bracket- Right Side (2) - Install

  17. Rear Suspension Cradle Front Bolt- Right Side (3) - Install NEW and hand tighten
  18. Rear Suspension Bracket Bolt- Right Side (4) - Install and tighten - Fastener Specifications
  19. Rear Suspension Bracket Bolt- Right Side (1) - Install and tighten - Fastener Specifications
  20. Rear Suspension Cradle Front Bolt (3)- Right Side - Tighten - Fastener Specifications

    DO NOT ATTEMPT OTHER REPAIRS WITH JACK STANDS IN PLACE.

  21. GM5591038Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Reposition the hoist lift pad (2) back underneath the right side of the vehicle.

  22. Using the jack stand (1) and the block of wood, slowly lower the vehicle back on the hoist pad (2).
  23. GM5590838Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Remove the jack stand (2) and the block of wood (1) from underneath the right side of vehicle.

  24. GM5590838Courtesy of GENERAL MOTORS COMPANY

    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 left side.

  25. GM5591038Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    DO NOT raise the vehicle higher than necessary.

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

  26. GM5892743Courtesy of GENERAL MOTORS COMPANY

    Rear Suspension Cradle Front Bolt- Left Side (1) - Remove and DISCARD

  27. GM5442507Courtesy of GENERAL MOTORS COMPANY

    Rear Suspension Bracket- Front- Left Side (2) - Install

  28. Rear Suspension Cradle Front Bolt- Left Side (3) - Install NEW and hand tighten
  29. Rear Suspension Bracket Bolt- Left Side (4) - Install and tighten - Fastener Specifications
  30. Rear Suspension Bracket Bolt- Left Side (1) - Install and tighten - Fastener Specifications
  31. Rear Suspension Cradle Front Bolt- Left Side (3) - Tighten - Fastener Specifications

    DO NOT ATTEMPT OTHER REPAIRS WITH JACK STANDS IN PLACE.

  32. GM5591038Courtesy of GENERAL MOTORS COMPANY

    Reposition the hoist lift pad (2) back underneath the vehicle.

  33. Using the jack stand (1) and the block of wood, slowly lower the vehicle back on the hoist pad (2).
  34. GM5590838Courtesy of GENERAL MOTORS COMPANY

    Remove the jack stand (2) and the block of wood (1) from underneath the right side of vehicle.

  35. GM5590590Courtesy of GENERAL MOTORS COMPANY

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

  36. GM5504138Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

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

  37. GM5504137Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Suspension Lower Control Arm Inner Bolt- Left Side and Right Side (3) - Install NEW [2x]

  38. Rear Suspension Lower Control Arm Inner Washer- Left Side and Right Side (2) - Install [2x]
    39. NOTE:

    The final torque on the rear suspension lower control arm inner nut (1) is to be applied during the rear camber setting procedure.

  39. Rear Suspension Lower Control Arm Inner Nut- Left Side and Right Side (1) - Install and hand tighten [2x]
  40. GM5504136Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Left side shown, right side similar.
    • Correctly orient the rear coil spring as noted upon removal of the rear suspension lower control arm.

    Rear Coil Spring- Left Side and Right Side (1) - Install [2x]

  41. Support the rear suspension lower control arms (2) with an appropriate jack stands.
  42. Slowly lower the vehicle to apply tension on the rear coil springs (1) and rotate the rear suspension lower control arms (2) and align the rear suspension lower control arms (2) with the rear suspension knuckles.
  43. GM5337541Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Suspension Lower Control Arm Outer Bolt- Left Side and Right Side (3) - Install NEW [2x]

  44. Using the jack stands, raise the rear lower control arms enough to aid in the installation of the of the rear suspension lower control arm outer bolts.
  45. Rear Suspension Lower Control Arm Outer Nut- Left Side and Right Side (1) - Install [2x]
  46. Rear Suspension Lower Control Arm Outer Bolt- Left Side and Right Side (3) - Tighten [2x] - Fastener Specifications
  47. GM5335007Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Shock Absorber Bolt- Left Side and Right Side (2) @ Rear Suspension Lower Control Arm (3) - Install NEW and tighten [2x] - Fastener Specifications

  48. Remove the jack stands from beneath the rear suspension lower control arms.
  49. GM5334525Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

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

  50. Install the 8 left and right side rear spring pins (1).
  51. GM5876657Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Rear Brake Caliper- Left Side and Right Side (1) - Install [2x]

  52. If NEW threaded components are being installed, loosen the adhesive using a metal pick or similar tool before proceeding. If threaded components are reused, prepare the threaded components using the following steps:
    1. Remove any loose cured adhesive from the external threads of the components using a lint free cloth.
    2. Thread the cleaned components into the internal mating threads and remove to loosen trapped cured adhesive.
    3. Remove loose debris from internal and external threads using compressed air.
    4. Apply liquid thread locking adhesive in a strip along half of the length of the external threads, starting at the tip, just prior to installation. Adhesives, Fluids, Lubricants, and Sealers
  53. Rear Brake Caliper Bracket Bolt- Left Side and Right Side (1) - Install and tighten [4x] - Fastener Specifications
  54. GM5877737Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Left side shown, right side similar.

    Parking Brake Caliper- Left Side and Right Side (2) - Install [2x]

  55. Parking Brake BoltLeft side shown, right side similar. (1) - Install and tighten [4x] - Fastener Specifications
  56. Connect the left and right side parking brake actuator electrical connectors.
  57. GM5865268Courtesy of GENERAL MOTORS COMPANY

    Transmission Fluid Auxiliary Cooler Inlet Pipe (2) @ Transmission Fluid Cooler Pipe - Install

    Retaining Clip (1) - Engage

  58. Transmission Fluid Cooler Pipe Clip (1) - Install [2x]
  59. GM5864749Courtesy of GENERAL MOTORS COMPANY

    Transmission Fluid Auxiliary Cooler Outlet Pipe (2) @ Transmission Fluid Cooler Pipe - Install

  60. Retaining Clip (3) - Engage
  61. Transmission Fluid Cooler Pipe Clip (1) - Install [2x]
  62. GM5863854Courtesy of GENERAL MOTORS COMPANY

    Position the propeller shaft (1) in the vehicle.

  63. GM5863691Courtesy of GENERAL MOTORS COMPANY

    If NEW threaded components are being installed, loosen the adhesive using a metal pick or similar tool before proceeding. If threaded components are reused, prepare the threaded components using the following steps:

    1. Remove any loose cured adhesive from the external threads of the components using a lint free cloth.
    2. Thread the cleaned components into the internal mating threads and remove to loosen trapped cured adhesive.
    3. Apply thread locking adhesive to the external threads of the components. Adhesives, Fluids, Lubricants, and Sealers
    4. Apply liquid thread locking adhesive in a strip along half of the length of the external threads, starting at the tip, just prior to installation.
  64. Install the 2 propeller shaft bearing support bolts (1) and tighten. Fastener Specifications
  65. GM5863695Courtesy of GENERAL MOTORS COMPANY

    Align the reference mark (3) between the propeller shaft flange (1) and the rear axle pinion flange (2).

  66. GM5863697Courtesy of GENERAL MOTORS COMPANY

    If NEW threaded components are being installed, loosen the adhesive using a metal pick or similar tool before proceeding. If threaded components are reused, prepare the threaded components using the following steps:

    1. Remove any loose cured adhesive from the external threads of the components using a lint free cloth.
    2. Thread the cleaned components into the internal mating threads and remove to loosen trapped cured adhesive.
    3. Apply thread locking adhesive to the external threads of the components. Adhesives, Fluids, Lubricants, and Sealers
    4. Apply liquid thread locking adhesive in a strip along half of the length of the external threads, starting at the tip, just prior to installation.
  67. Install the 3 rear propeller shaft bolts (1) and the 3 rear propeller shaft nuts (2).
  68. Tighten the 3 the rear propeller shaft bolts (1). Fastener Specifications
  69. GM5863694Courtesy of GENERAL MOTORS COMPANY

    Align the reference mark (2) between the propeller shaft flange (3) and the output flange (1) of the transmission.

  70. GM5863696Courtesy of GENERAL MOTORS COMPANY

    If NEW threaded components are being installed, loosen the adhesive using a metal pick or similar tool before proceeding. If threaded components are reused, prepare the threaded components using the following steps:

    1. Remove any loose cured adhesive from the external threads of the components using a lint free cloth.
    2. Thread the cleaned components into the internal mating threads and remove to loosen trapped cured adhesive.
    3. Apply thread locking adhesive to the external threads of the components. Adhesives, Fluids, Lubricants, and Sealers
    4. Apply liquid thread locking adhesive in a strip along half of the length of the external threads, starting at the tip, just prior to installation.
  71. Install the 3 front propeller shaft bolts (2) and the 3 front propeller shaft nuts (1).
  72. Tighten the 3 front propeller shaft bolts (1). Fastener Specifications
  73. GM5867371Courtesy of GENERAL MOTORS COMPANY

    Transmission Mount (2) - Install

    74. NOTE:

    For proper bolt alignment, loosely install all mount bolts prior to tightening to specifications.

  74. Transmission Mount Bolt (1) - Loosely install [2x]
  75. GM5867370Courtesy of GENERAL MOTORS COMPANY

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

  76. GM5867371Courtesy of GENERAL MOTORS COMPANY

    Transmission Mount Bolt (1) - Tighten [2x] - Fastener Specifications

  77. GM5867370Courtesy of GENERAL MOTORS COMPANY

    Transmission Mount Bracket Bolt (1) - Tighten [4x] - Fastener Specifications

  78. Remove the jack stand.
  79. GM5334717Courtesy of GENERAL MOTORS COMPANY

    Floor Panel Number 2 Cross Bar Reinforcement (2) - Install

  80. Floor Panel Number 2 Cross Bar Reinforcement Bolt (1) - Install and tighten [4x] - Fastener Specifications 
  81. GM5865888Courtesy of GENERAL MOTORS COMPANY

    Exhaust Intermediate Underbody Heat Shield (2) - Install

  82. Exhaust Heat Shield Bolt (1) - Install and tighten [2x] - Fastener Specifications
  83. GM5865329Courtesy of GENERAL MOTORS COMPANY

    Catalytic Converter Gasket (2) - Install NEW

  84. With the aid of an assistant, install the exhaust muffler (1).
  85. GM5865300Courtesy of GENERAL MOTORS COMPANY

    Exhaust Muffler Hanger Bracket Nut (1) - Install and tighten [4x] - Fastener Specifications

  86. GM5865293Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (1) - Connect

  87. GM5865287Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (1) - Connect

  88. GM5406632Courtesy of GENERAL MOTORS COMPANY

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

  89. GM5406578Courtesy of GENERAL MOTORS COMPANY

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

  90. GM5865271Courtesy of GENERAL MOTORS COMPANY

    Exhaust Pipe Clamp (1) - Tighten [2x] - Fastener Specifications

  91. GM5865265Courtesy of GENERAL MOTORS COMPANY

    Catalytic Converter Nut (1) - Install and tighten [2x] - Fastener Specifications

  92. GM5400756Courtesy of GENERAL MOTORS COMPANY

    Floor Panel Reinforcement (2) - Install

  93. Floor Panel Number 4 Cross Bar Reinforcement Bolt (1) - Install and tighten [6x] - Fastener Specifications 
  94. GM5854893Courtesy of GENERAL MOTORS COMPANY

    Underbody Rear Air Deflector- Left Side (5) - Install

  95. Underbody Rear Air Deflector Bolt- Left Side (4) - Install and tighten [2x] - Fastener Specifications
  96. Transmission Fluid Cooler Pipe Bracket Bolt- Left Side (3) - Install and tighten [2x] - Fastener Specifications
  97. Underbody Rear Air Deflector Nut- Left Side (2) - Install and tighten [5x] - Fastener Specifications 
  98. Underbody Front Air Deflector Bolt- Left Side (1) - Install and tighten [6x] - Fastener Specifications 
  99. GM5839256Courtesy of GENERAL MOTORS COMPANY

    Underbody Rear Air Deflector- Right Side (5) - Install

  100. Underbody Rear Air Deflector Bolt- Right Side (4) - Install and tighten [2x] - Fastener Specifications
  101. Transmission Fluid Cooler Pipe Bracket Bolt- Right Side (3) - Install and tighten [2x] - Fastener Specifications
  102. Underbody Rear Air Deflector Nut- Right Side (2) - Install and tighten [5x] - Fastener Specifications 
  103. Underbody Front Air Deflector Bolt- Right Side (1) - Install and tighten [6x] - Fastener Specifications 
  104. GM5400642Courtesy of GENERAL MOTORS COMPANY

    Underbody Rear Air Deflector- Right Side (5) - Install

  105. Underbody Rear Air Deflector Nut- Right Side (3) - Install and tighten [3x] - Fastener Specifications 
  106. Underbody Rear Air Deflector Bolt- Right Side (2) - Install and tighten [3x] - Fastener Specifications 
  107. Underbody Rear Air Deflector Nut- Right Side (4) - Install and tighten [2x] - Fastener Specifications 
  108. Rear Wheelhouse Liner Bolt- Right Side (1) - Install and tighten - Fastener Specifications 
  109. GM5400553Courtesy of GENERAL MOTORS COMPANY

    Underbody Rear Air Deflector- Left Side (5) - Install

  110. Underbody Rear Air Deflector Nut- Left Side (2) - Install and tighten [3x] - Fastener Specifications 
  111. Underbody Rear Air Deflector Bolt- Left Side (3) - Install and tighten [3x] - Fastener Specifications 
  112. Underbody Rear Air Deflector Nut- Left Side (4) - Install and tighten [2x] - Fastener Specifications 
  113. Rear Wheelhouse Liner Bolt- Left Side (1) - Install and tighten - Fastener Specifications 
  114. GM5395705Courtesy of GENERAL MOTORS COMPANY

    Rear Tire Front Air Deflector- Left Side and Right Side (2) - Install [2x]

  115. Rear Tire Front Air Deflector Bolt- Left Side and Right Side (1) - Install and tighten [4x] - Fastener Specifications 
  116. Install the rear tire and wheel assemblies. Tire and Wheel Removal and Installation
  117. Remove the support and lower the vehicle.
  118. Connect the battery negative cable. Battery Negative Cable Disconnection and Connection
  119. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.
  120. Slowly release the brake pedal.
  121. Wait 15 seconds, then repeat steps 119 - 120 until a firm brake pedal is obtained. This will properly seat the brake caliper pistons and brake pads.
  122. Fill the brake master cylinder reservoir to the maximum-full level with GM approved brake fluid from a clean, sealed brake fluid container. Brake Master Cylinder Reservoir Filling
  123. Calibrate the park brake.
    1. Block the drive wheels.
    2. Install a scan tool to the vehicle.
    3. Turn the ignition switch to the ON/RUN position with the engine OFF.
    4. Select Configuration/Reset Functions from the Brake System Control Module.
    5. If available, perform the Parking Brake Calibration Procedure.
    6. If Park Brake Calibration is not available, proceed back and select Control Functions.
    7. Perform the Deactivate Rear Park Brake Service Position function.
    8. Apply and release the park brakes using the park brake switch to ensure that the system is functioning.
  124. Inspect the exhaust system for leaks.
  125. Perform wheel alignment. Wheel Alignment Measurement
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