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Frame and Underbody Buick LaCrosse II

Frames, Subframes & Crossmembers 14 illustrations ~2336 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Frame-to-Body Fasteners160 N.m118 lb ft
Frame-to-Body Reinforcement Fasteners60 N.m + 30 degrees44 lb ft + 30 degrees
Front Stabilizer Shaft Clamp Fasteners22 N.m + 30 degrees + 15 degrees16 lb ft + 30 degrees + 15 degrees
Front Transmission Mount Through Bolt100 N.m74 lb ft
Rear Stabilizer Shaft Clamp Fasteners22 N.m + 30 degrees + 15 degrees16 lb ft + 30 degrees + 15 degrees
Rear Support Reinforcement Arm Bolts150 N.m + 30 degrees + 15 degrees111 lb ft + 30 degrees + 15 degrees
Rear Support-to-Body Fasteners90 N.m + 120 degrees + 15 degrees66 lb ft + 120 degrees + 15 degrees
Rear Transmission Mount Through Bolt100 N.m74 lb ft
Steering Gear Fasteners110 N.m + 150 degrees + 15 degrees81 lb ft + 150 degrees + 15 degrees

Fastener Tightening Specifications

Scheme 1

Scheme 1: Front Compartment Splash Shield Replacement
Scheme 1: Front Compartment Splash Shield Replacement
CalloutComponent Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle
1Front Compartment Splash Shield Fastener (Qty 3) CAUTION: Refer to Fastener Caution .
2Front Compartment Splash Shield Retainer (Qty 2)
3Front Compartment Splash Shield
CAUTION
Refer to Fastener Caution .

Front Compartment Splash Shield Replacement

Scheme 2

Scheme 2: Underbody Front Air Deflector Replacement - Left Side
Scheme 2: Underbody Front Air Deflector Replacement - Left Side
CalloutComponent Name
WARNING: Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death. Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove rear air deflector replacement left side. Refer to Underbody Rear Air Deflector Replacement - Left Side .
1Underbody Front Air Deflector Fastener (Qty: 6) CAUTION: Refer to Fastener Caution . Tighten 2.5 N.m (22 lb in)
2Underbody Left Front Air Deflector Fastener (Qty: 2)
3Underbody Left Front Air Deflector
WARNING
Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death.
CAUTION
Refer to Fastener Caution .

Underbody Front Air Deflector Replacement - Left Side

Scheme 3

Scheme 3: Underbody Front Air Deflector Replacement - Right Side
Scheme 3: Underbody Front Air Deflector Replacement - Right Side
CalloutComponent Name
WARNING: Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death. Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove rear air deflector replacement right side. Refer to Underbody Rear Air Deflector Replacement - Right Side .
1Underbody Front Air Deflector Fastener (Qty: 8) CAUTION: Refer to Fastener Caution . Tighten 2.5 N.m (22 lb in)
2Underbody Right Front Air Deflector
WARNING
Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death.
CAUTION
Refer to Fastener Caution .

Underbody Front Air Deflector Replacement - Right Side

Scheme 4

Scheme 4: Underbody Rear Air Deflector Replacement - Left Side
Scheme 4: Underbody Rear Air Deflector Replacement - Left Side
CalloutComponent Name
WARNING: Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death. Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle
1Underbody Front Air Deflector Fasteners (Qty 7) CAUTION: Refer to Fastener Caution .
2Underbody Left rear Air Deflector
WARNING
Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death.
CAUTION
Refer to Fastener Caution .

Underbody Rear Air Deflector Replacement - Left Side

Scheme 5

Scheme 5: Underbody Rear Air Deflector Replacement - Right Side
Scheme 5: Underbody Rear Air Deflector Replacement - Right Side
CalloutComponent Name
WARNING: Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death. Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Underbody Front Air Deflector Fastener (Qty: 12) CAUTION: Refer to Fastener Caution .
2Underbody Right Rear Air Deflector
WARNING
Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death.
CAUTION
Refer to Fastener Caution .

Underbody Rear Air Deflector Replacement - Right Side

Scheme 6

Scheme 6: Underbody Rear Air Outer Deflector Bracket Replacement - Right Side
Scheme 6: Underbody Rear Air Outer Deflector Bracket Replacement - Right Side
CalloutComponent Name
WARNING: Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death. Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove underbody rear air deflector right side. Refer to Underbody Rear Air Deflector Replacement - Right Side .
1Underbody Rear Air Outer Deflector Bracket Right Side Fastener (Qty: 1) CAUTION: Refer to Fastener Caution . Tighten: 9 (80 lb in)
2Underbody Rear Air Outer Deflector Bracket Right Side
WARNING
Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death.
CAUTION
Refer to Fastener Caution .

Underbody Rear Air Outer Deflector Bracket Replacement - Right Side

Scheme 7

Scheme 7: Underbody Rear Air Outer Deflector Bracket Replacement - Left Side
Scheme 7: Underbody Rear Air Outer Deflector Bracket Replacement - Left Side
CalloutComponent Name
WARNING: Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death. Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove underbody rear air deflector left side. Refer to Underbody Rear Air Deflector Replacement - Left Side .
1Underbody Rear Air Outer Deflector Bracket Left Side Fastener (Qty: 1) CAUTION: Refer to Fastener Caution . Tighten: 9 (80 lb in)
2Underbody Rear Air Outer Deflector Bracket Left Side
WARNING
Do not use a service jack to lift this vehicle. Lifting the vehicle with a jack could cause the vehicle to slip off the jack and roll; this could cause injury or death.
CAUTION
Refer to Fastener Caution .

Underbody Rear Air Outer Deflector Bracket Replacement - Left Side

Scheme 8

Scheme 8: Removal Procedure
Scheme 8: Removal Procedure
  1. Install the engine support fixture. Refer to «Engine Support Fixture»(/buick/lacrosse/ii-2009-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle__engine-support-fixture) .
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  3. Remove the front wheels. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/ii-2009-2013/remont/wheel-tire-system/#tires-and-wheels) .
  4. Remove the front fascia. Refer to «Front Bumper Fascia Replacement»(/buick/lacrosse/ii-2009-2013/remont/exterior-body-panels/#bumpers-and-fascias) .
  5. Tie the radiator, air conditioning condenser, and fan module assembly to the upper radiator support to keep the assembly with the vehicle when the frame is lowered.
  6. Disconnect the left and right stabilizer links from the strut assemblies. Refer to «Stabilizer Shaft Link Replacement»(/buick/lacrosse/ii-2009-2013/remont/suspension-front/#front-suspension-system) .
  7. Disconnect the tie rod ends from the steering knuckles. Refer to «Steering Knuckle Replacement (GNB)»(/buick/lacrosse/ii-2009-2013/remont/suspension-front/#front-suspension-system) , «Steering Knuckle Replacement (GNA)»(/buick/lacrosse/ii-2009-2013/remont/suspension-front/#front-suspension-system) .
  8. Remove the two steering gear retaining bolts. Refer to «Steering Gear Replacement (NJ1)»(/buick/lacrosse/ii-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7)»(/buick/lacrosse/ii-2009-2013/remont/manual-power-steering/#power-steering-system) .
  9. Using mechanics wire suspend the steering gear from the powertrain.
  10. Remove the front exhaust pipe. Refer to «Exhaust Front Pipe Replacement (LFX)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) , «Exhaust Front Pipe Replacement (LUK)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) .
  11. On AWD vehicles, remove the propeller shaft. Refer to «Propeller Shaft Replacement»(/buick/lacrosse/ii-2009-2013/remont/driveshaft-universal-joints/#propeller-shaft) .
  12. Remove the front transmission mount through bolt (1).
  13. Remove the rear transmission mount bolts (3).
  14. Separate the lower ball joints from the steering knuckles (1). Refer to «Lower Control Arm Replacement (GNB)»(/buick/lacrosse/ii-2009-2013/remont/suspension-front/#front-suspension-system) , «Lower Control Arm Replacement (GNA)»(/buick/lacrosse/ii-2009-2013/remont/suspension-front/#front-suspension-system) .
  15. Remove the electrical harness and the power steering cooler line from the clips in the frame (2).
  16. Mark the location of the frame using spray paint for correct positioning during installation.
  17. Carefully lower the vehicle until the frame contacts the support table.
  18. Remove the frame reinforcements. Discard the frame reinforcement to body bolts. Do Not discard the cradle bolts.
  19. Remove the two rear frame to body bolts.
  20. Remove the two front frame-to-body bolts.
  21. Carefully raise the vehicle to separate the frame from the body.
  22. If replacing the frame, transfer components as necessary.

Installation Procedure

  1. Carefully lower the vehicle until contacts the frame assembly and is correctly positioned within the spray painted areas.
  2. Install the frame retaining bolts then tighten the bolts to 160 N.m (118 lb ft).
  3. Install the frame reinforcements with NEW bolts and then tighten the bolts to 60 N.m (44 lb ft) plus 30 degrees.
  4. Remove the mechanics wire and install the steering gear. Refer to «Steering Gear Replacement (NJ1)»(/buick/lacrosse/ii-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7)»(/buick/lacrosse/ii-2009-2013/remont/manual-power-steering/#power-steering-system) .
  5. Install the electrical harness and the power steering cooler line to the clips in the frame (2).
  6. Connect the ball joint studs to the steering knuckles (1). Refer to «Lower Control Arm Replacement (GNB)»(/buick/lacrosse/ii-2009-2013/remont/suspension-front/#front-suspension-system) , «Lower Control Arm Replacement (GNA)»(/buick/lacrosse/ii-2009-2013/remont/suspension-front/#front-suspension-system) .
  7. Install the rear transmission mount through bolt (1) and tighten to 100 N.m (74 lb ft).
  8. Install the front transmission mount bolts and nut then tighten to 100 N.m (74 lb ft).
  9. Untie the radiator, air conditioning condenser, and fan module assembly from the upper radiator support.
  10. Connect the left and right stabilizer links to the strut assemblies. Refer to «Stabilizer Shaft Link Replacement»(/buick/lacrosse/ii-2009-2013/remont/suspension-front/#front-suspension-system) .
  11. Connect the tie rod ends to the steering knuckles. Refer to «Steering Knuckle Replacement (GNB)»(/buick/lacrosse/ii-2009-2013/remont/suspension-front/#front-suspension-system) , «Steering Knuckle Replacement (GNA)»(/buick/lacrosse/ii-2009-2013/remont/suspension-front/#front-suspension-system) .
  12. On AWD vehicles, install the propeller shaft. Refer to «Propeller Shaft Replacement»(/buick/lacrosse/ii-2009-2013/remont/driveshaft-universal-joints/#propeller-shaft) .
  13. Install the front exhaust pipe. Refer to «Exhaust Front Pipe Replacement (LFX)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) , «Exhaust Front Pipe Replacement (LUK)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) .
  14. Remove the engine support fixture.
  15. Install the front fascia. Refer to «Front Bumper Fascia Replacement»(/buick/lacrosse/ii-2009-2013/remont/exterior-body-panels/#bumpers-and-fascias) .
  16. Install the front wheels. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/ii-2009-2013/remont/wheel-tire-system/#tires-and-wheels) .
  17. Lower the vehicle.
  18. Check the wheel alignment.

Removal Procedure

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the rear tire and wheel assemblies. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/ii-2009-2013/remont/wheel-tire-system/#tires-and-wheels) .
  3. Remove the rear muffler assembly. Refer to «Exhaust Muffler Replacement (Single)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) , «Exhaust Muffler Replacement (LFX)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) .
  4. Disconnect the stabilizer shaft from stabilizer shaft links. Refer to «Stabilizer Shaft Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Stabilizer Shaft Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  5. Remove the park brake cables from the support. Refer to «Parking Brake Rear Cable Replacement (J71)»(/buick/lacrosse/ii-2009-2013/remont/parking-brake-system/#parking-brake-system) .
  6. Remove the lower control arms from the vehicle. Refer to «Rear Axle Lower Control Arm Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Rear Axle Lower Control Arm Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  7. Remove the adjust links from the from the vehicle. Refer to «Adjust Link Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Adjust Link Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  8. Remove the upper control arm inner fasteners. Refer to «Rear Axle Upper Control Arm Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Rear Axle Upper Control Arm Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  9. Position a transmission jack under the rear support and firmly secure the support to the jack with straps.
  10. Mark the location of the frame using spray paint for correct positioning during installation.
  11. Remove the support bolts and discard them.
  12. With the aid of an assistant, lower the support from the transmission jack stand.
  13. Remove the stabilizer shaft from the rear support.
  1. Install the stabilizer shaft assembly on to the support. Refer to «Stabilizer Shaft Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Stabilizer Shaft Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  2. With the aid of an assistant, position the rear support onto the transmission jack and firmly secure the support to the jack with straps.
  3. Carefully lower the vehicle until contacts the frame assembly and is correctly positioned within the spray painted areas.
  4. Install the NEW support bolts and tighten to 90 N.m (66 lb ft).
  5. Tighten the support bolts an additional 120 degrees + 15 degrees.
  6. Remove the transmission jack stand.
  7. Install the upper control arm inner fasteners. Refer to «Rear Axle Upper Control Arm Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Rear Axle Upper Control Arm Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  8. Install the adjust links to the support. Refer to «Adjust Link Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Adjust Link Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  9. Install the lower control arms. Refer to «Rear Axle Lower Control Arm Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Rear Axle Lower Control Arm Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  10. Install the park brake cables to the rear support. Refer to «Parking Brake Rear Cable Replacement (J71)»(/buick/lacrosse/ii-2009-2013/remont/parking-brake-system/#parking-brake-system) .
  11. Install the rear muffler assembly. Refer to «Exhaust Muffler Replacement (Single)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) , «Exhaust Muffler Replacement (LFX)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system)
  12. Connect the stabilizer shaft links to the stabilizer shaft. Refer to «Stabilizer Shaft Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Stabilizer Shaft Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  13. Install the rear tire and wheel assemblies. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/ii-2009-2013/remont/wheel-tire-system/#tires-and-wheels) .
  14. Lower the vehicle.
  15. Realign the rear suspension. Refer to «Wheel Alignment Measurement»(/buick/lacrosse/ii-2009-2013/remont/wheel-alignment/#wheel-alignment-system__wheel-alignment-measurement) .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the tires and wheels. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/ii-2009-2013/remont/wheel-tire-system/#tires-and-wheels) .
  3. Remove the exhaust muffler. Refer to «Exhaust Muffler Replacement (Single)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) , «Exhaust Muffler Replacement (LFX)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) .
  4. Remove the park brake cables from the support. Refer to «Parking Brake Rear Cable Replacement (J71)»(/buick/lacrosse/ii-2009-2013/remont/parking-brake-system/#parking-brake-system) .
  5. Remove the shock absorber lower fastener. Refer to «Shock Absorber Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Shock Absorber Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  6. Remove the rear wheel hub brackets. Refer to «Rear Wheel Hub Bracket Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  7. Remove the lower control arms from the vehicle. Refer to «Rear Axle Lower Control Arm Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Rear Axle Lower Control Arm Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  8. Remove the upper control arms from the vehicle. Refer to «Rear Axle Upper Control Arm Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Rear Axle Upper Control Arm Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  9. Remove reinforcement arm bolts (1) to body.
  10. Remove the outer fastener adjustment links. Refer to «Adjust Link Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Adjust Link Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  11. Remove the rear wheel drive shafts. Refer to «Rear Wheel Drive Shaft Replacement»(/buick/lacrosse/ii-2009-2013/remont/axle-shafts/#wheel-drive-shafts) .
  12. Remove the differential carrier assembly. Refer to «Differential Carrier Assembly Replacement»(/buick/lacrosse/ii-2009-2013/remont/differentials-drive-axles/#rear-drive-axle) .
  13. Position a transmission jack under the rear support and firmly secure the support to the jack with straps.
  14. Mark the location of the frame using spray paint for correct positioning during installation.
  15. Remove the 4 rear support to body bolts (1).
  16. Remove the rear support assembly from the vehicle.
  17. Remove the inner fastener from adjustments links. Refer to «Adjust Link Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Adjust Link Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  18. With the aid of an assistant, remove the rear support from the transmission jack and place it on the floor.
  1. With the aid of an assistant, position the rear support onto the transmission jack and firmly secure the support to the jack with straps.
  2. Install the inner fastener to adjustments links. Refer to «Adjust Link Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Adjust Link Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  3. Carefully lower the vehicle until contacts the frame assembly and is correctly positioned within the spray painted areas.
  4. Install 4 NEW rear support to body bolts (1) and tighten to: First Pass: 90 N.m (66 lb ft) Second Pass: plus 180 degrees Final Pass: plus 15 degrees
  5. Install the differential. Refer to «Differential Carrier Assembly Replacement»(/buick/lacrosse/ii-2009-2013/remont/differentials-drive-axles/#rear-drive-axle) .
  6. Install the rear wheel drive shafts. Refer to «Rear Wheel Drive Shaft Replacement»(/buick/lacrosse/ii-2009-2013/remont/axle-shafts/#wheel-drive-shafts) .
  7. Install the outer fastener adjustment links. Refer to «Adjust Link Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Adjust Link Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  8. Install NEW reinforcements arm bolts (1) to body and tighten to: First Pass: 150 N.m (111 lb ft) Second Pass: plus 30 degrees Final Pass: plus 15 degrees
  9. Install the upper control arms. Refer to «Rear Axle Upper Control Arm Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Rear Axle Upper Control Arm Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  10. Install the lower control arms. Refer to «Rear Axle Lower Control Arm Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Rear Axle Lower Control Arm Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  11. Install the rear wheel hub brackets. Refer to «Rear Wheel Hub Bracket Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  12. Install the shock absorber lower fastener. Refer to «Shock Absorber Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Shock Absorber Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  13. Install the park brake cable. Refer to «Parking Brake Rear Cable Replacement (J71)»(/buick/lacrosse/ii-2009-2013/remont/parking-brake-system/#parking-brake-system) .
  14. Install the exhaust muffler. Refer to «Exhaust Muffler Replacement (Single)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) , «Exhaust Muffler Replacement (LFX)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) .
  15. Install the tires and wheels. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/ii-2009-2013/remont/wheel-tire-system/#tires-and-wheels) .
  16. Check the rear alignment. Refer to «Wheel Alignment Measurement»(/buick/lacrosse/ii-2009-2013/remont/wheel-alignment/#wheel-alignment-system__wheel-alignment-measurement) .

Special Tools

  1. CH-48377 Remover/Installer
  2. CH-49233 Bushing Tool
  3. CH-50196 Bushing Installer
  4. DT-49126-10 Bushing Remov and Install Kit
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the tires and wheels. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/ii-2009-2013/remont/wheel-tire-system/#tires-and-wheels) .
  3. Remove the exhaust muffler. Refer to «Exhaust Muffler Replacement (Single)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) , «Exhaust Muffler Replacement (LFX)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) .
  4. Remove shock absorber lower fastener. Refer to «Shock Absorber Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Shock Absorber Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  5. Remove rear springs. Refer to «Rear Spring, Insulator, and Jounce Bumper Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  6. Disconnect the electrical connection.
  7. Remove reinforcement arm bolts (1) to body.
  8. Remove the propeller shaft. Refer to «Propeller Shaft Replacement»(/buick/lacrosse/ii-2009-2013/remont/driveshaft-universal-joints/#propeller-shaft) .
  9. Position a transmission jack under the rear support and firmly secure the support to the jack with straps.
  10. Mark up support position to body with spray paint.
  11. Remove the 4 rear support to body bolts (1).
  12. Remove the rear support assembly from the vehicle.
  13. With the aid of an assistant, remove the rear support from the transmission jack and place it on the floor.
  14. Remove the washers from the front bushings.
  15. Drill through rubber bushings with drill 8 mm. See applicable diagram.
  16. Remove the bushings by placing CH-48377-1 drift mandrel between bushings and wall of rear axle and drift out.

Note. When transferring any suspension components, refer to each suspension component replacement procedure for the proper torque specifications.

  1. Locate the front bushings as shown in the picture.
  2. Position the rear bushings in the frame.
  3. Use the DT-49126-10 tool (1), CH-50196 tool (3) and the CH-49233 tool (2), install the bushing.
  4. With the aid of an assistant, position the rear support onto the transmission jack and firmly secure the support to the jack with straps.
  5. Position the rear support assembly to the vehicle.
  6. Install 4 NEW rear support to body bolts (1). Tighten Tighten to 90 N.m (66 lb ft) + 180 degrees + 15 degrees.
  7. Connect the electrical connection.
  8. Install rear springs. Refer to «Rear Spring, Insulator, and Jounce Bumper Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  9. Install the propeller shaft. Refer to «Propeller Shaft Replacement»(/buick/lacrosse/ii-2009-2013/remont/driveshaft-universal-joints/#propeller-shaft) .
  10. Install NEW reinforcements arm bolts (1) to body. Tighten Tighten the bolts to 150 N.m (111 lb ft) + 30 degrees + 15 degrees.
  11. Install shock absorber lower fastener. Refer to «Shock Absorber Replacement (GNE)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) , «Shock Absorber Replacement (GNC)»(/buick/lacrosse/ii-2009-2013/remont/suspension-rear/#rear-suspension-system) .
  12. Install the exhaust muffler. Refer to «Exhaust Muffler Replacement (Single)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) , «Exhaust Muffler Replacement (LFX)»(/buick/lacrosse/ii-2009-2013/remont/exhaust/#engine-exhaust-system) .
  13. Install the tires and wheels. Refer to «Tire and Wheel Removal and Installation»(/buick/lacrosse/ii-2009-2013/remont/wheel-tire-system/#tires-and-wheels) .
  14. Lower the vehicle.
  15. Check the rear alignment. Refer to «Wheel Alignment Measurement»(/buick/lacrosse/ii-2009-2013/remont/wheel-alignment/#wheel-alignment-system__wheel-alignment-measurement) .

Drivetrain and Front Suspension Frame Insulator Replacement

Special Tools

CH-49384 Remover/Installer

For equivalent regional tools, refer to Special Tools .

  1. Separate the frame from the body approximately 70 mm. Refer to «Drivetrain and Front Suspension Frame Replacement»(/buick/lacrosse/ii-2009-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  2. Remove the bushings using a CH-49384 remover/installer (2).
  1. Locate the front bushings as shown.
  2. Install the bushings using CH-49384 remover/installer.
  3. Install the frame to the body. Refer to «Drivetrain and Front Suspension Frame Replacement»(/buick/lacrosse/ii-2009-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .

Scheme 9

Scheme 9: Front Wheelhouse Front Liner Replacement
Scheme 9: Front Wheelhouse Front Liner Replacement
CalloutComponent Name
Preliminary Procedure Remove the front wheelhouse rear liner. Refer to Front Wheelhouse Rear Liner Replacement .
1Front Wheelhouse Liner - Front Screw (Qty: 5) CAUTION: Refer to Fastener Caution . Tighten 2.5 N.m (22 lb in)
2Front Wheelhouse Liner - Front Screw (Qty: 4) Tighten 2.5 N.m (22 lb in)
3Front Wheelhouse Liner - Front Push-In Retainer (Qty: 2)
4Front Wheelhouse Liner - Front Interlocking Retainer
5Front Wheelhouse Liner - Front
CAUTION
Refer to Fastener Caution .

Front Wheelhouse Front Liner Replacement

Scheme 10

Scheme 10: Front Wheelhouse Rear Liner Replacement
Scheme 10: Front Wheelhouse Rear Liner Replacement
CalloutComponent Name
Preliminary Procedure Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation .
1Front Wheelhouse Panel Rear Plastic Retainer (Qty: 6)
2Front Wheelhouse Panel Rear Liner Interlocking Retainer
3Front Wheelhouse Panel Rear

Front Wheelhouse Rear Liner Replacement

Scheme 11

Scheme 11: Rear Wheelhouse Panel Liner Replacement
Scheme 11: Rear Wheelhouse Panel Liner Replacement
CalloutComponent Name
1Rear Wheelhouse Panel Liner Screw (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 3 N.m (27 lb in)
2Rear Wheelhouse Panel Liner Nut (Qty: 3) Tighten 1.8 N.m (15 lb in)
3Rear Wheelhouse Panel Liner Push-In Retainer (Qty: 2)
4Rear Wheelhouse Panel Liner TIP: Unclip the exhaust shield retainer.
CAUTION
Refer to Fastener Caution .

Rear Wheelhouse Panel Liner Replacement

Illustration Tool Number/Description CH 49233 Bushing Tool CH 49158 RDM Bushing Removal Tool CH 49384 Remover/Installer CH 50196 Bushing Installer DT 49126-10 Bushing Remov and Install Kit

Scheme 12

Scheme 12: Special Tools
Scheme 12: Special Tools

Scheme 13

Scheme 13
Scheme 13

Scheme 14

Scheme 14
Scheme 14