GM Service Manual Online
For 1990-2009 cars only

Steering Gear Replacement EPS

Removal Procedure

    Notice: Secure the steering wheel utilizing a strap to prevent rotation. Locking of the steering column will prevent damage and a possible malfunction of the SIR system. The steering wheel must be secured in position before disconnecting the following components:

       • The steering column
       • The intermediate shaft
       • The steering gear
    After disconnecting these components, do not move the front tires and wheels. Failure to follow these procedures may cause improper alignment of some components during installation and result in possible damage to the SIR coil.

  1. Turn the front wheels to the straight forward position and secure the steering wheel from moving.
  2. Disengage the steering linkage outer tie rods from the steering knuckles. Refer to Steering Linkage Outer Tie Rod Replacement .
  3. Separate the intermediate steering shaft from the steering gear. Refer to Intermediate Steering Shaft Replacement .

  4. Object Number: 1770184  Size: SH
  5. Remove the transmission rear mount bolt.

  6. Object Number: 1229955  Size: SH
  7. Remove the steering gear bolts, nuts, and washers from the steering gear.
  8. Important: The position of the steering gear will need to be manipulated to remove it through the left front wheel opening.

  9. Remove the steering gear through the left front wheel opening.
  10. Transfer any parts as needed.

Installation Procedure

  1. Install the steering gear through the left front wheel opening.
  2. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1229955  Size: SH

    Important: Start all of the bolts and nuts by hand before finalizing any torques.

  3. Install the steering gear bolts, nuts, and washers to the steering gear.
  4. Tighten
    Tighten the bolts to 70 N·m (52 lb ft) plus an additional 90 degrees.


    Object Number: 1770184  Size: SH
  5. Install the transmission rear mount bolt.
  6. Tighten
    Tighten the bolt to 90 N·m (66 lb ft).

  7. Install the intermediate steering shaft to the steering gear. Refer to Intermediate Steering Shaft Replacement .
  8. Install the steering linkage outer tie rods to the steering knuckles. Refer to Steering Linkage Outer Tie Rod Replacement .
  9. Adjust the front toe. Refer to Front Toe Adjustment .

Steering Gear Replacement HPS with LY7

Removal Procedure

    Notice: Secure the steering wheel utilizing a strap to prevent rotation. Locking of the steering column will prevent damage and a possible malfunction of the SIR system. The steering wheel must be secured in position before disconnecting the following components:

       • The steering column
       • The intermediate shaft
       • The steering gear
    After disconnecting these components, do not move the front tires and wheels. Failure to follow these procedures may cause improper alignment of some components during installation and result in possible damage to the SIR coil.

  1. Turn the front wheels to the straight forward position and secure the steering wheel from moving.
  2. Remove as much power steering fluid from the remote power steering fluid reservoir as possible.
  3. Place drain pans under the vehicle as needed.
  4. Disengage the steering linkage outer tie rods from the steering knuckles. Refer to Steering Linkage Outer Tie Rod Replacement .
  5. Separate the intermediate steering shaft from the steering gear. Refer to Intermediate Steering Shaft Replacement .

  6. Object Number: 1867636  Size: SH
  7. Remove the steering gear heat shield from the steering gear.

  8. Object Number: 1812155  Size: SH
  9. Remove the transmission brace bolt.

  10. Object Number: 1812194  Size: SH
  11. Remove the transmission rear mount bolt and position the transmission brace aside.

  12. Object Number: 1812202  Size: SH
  13. Loosen the rear transmission mount bracket bolt.

  14. Object Number: 1812212  Size: SH
  15. Remove the 2 remaining transmission rear mount bolts.

  16. Object Number: 1975906  Size: SH
  17. Remove the 3 rear transmission mount bracket nuts and bolts (1).
  18. Position the transmission rear mount and bracket aside.

  19. Object Number: 1812254  Size: SH
  20. Remove the power steering gear inlet hose bolt and disconnect the power steering gear inlet hose and the power steering gear outlet hose from the steering gear.
  21. Remove the steering gear bolts, nuts, and washers from the steering gear.
  22. Important: The position of the steering gear will need to be manipulated to remove it through the left front wheel opening.

  23. Remove the steering gear through the left front wheel opening.
  24. Transfer any parts as needed.

Installation Procedure

  1. Install the steering gear through the left front wheel opening.
  2. Notice: Refer to Fastener Notice in the Preface section.

    Important: Start all of the bolts and nuts by hand before finalizing any torques.

  3. Install the steering gear bolts, nuts, and washers to the steering gear.
  4. Tighten
    Tighten the bolts and nuts to 110 N·m (81 lb ft).


    Object Number: 1812254  Size: SH
  5. Connect the power steering gear inlet hose and the power steering gear outlet hose to the steering gear and install the power steering gear inlet hose bolt.
  6. Tighten
    Tighten the bolt to 27 N·m (20 lb ft).

  7. Position the transmission rear mount and bracket in place.

  8. Object Number: 1975906  Size: SH
  9. Install the 3 rear transmission mount bracket bolts (1) and nuts.
  10. Tighten
    Tighten the nuts to 50 N·m (37 lb ft).


    Object Number: 1812212  Size: SH
  11. Install the 2 remaining transmission rear mount bolts.

  12. Object Number: 1812194  Size: SH
  13. Position the transmission brace in place and install the transmission rear mount bolt.
  14. Tighten
    Tighten the 3 bolts to 50 N·m (37 lb ft).


    Object Number: 1812155  Size: SH
  15. Install the transmission brace bolt.
  16. Tighten
    Tighten the bolt to 50 N·m (37 lb ft).


    Object Number: 1812202  Size: SH
  17. Tighten the rear transmission mount bracket bolt.
  18. Tighten
    Tighten the bolt to 50 N·m (37 lb ft).


    Object Number: 1867636  Size: SH
  19. Install the steering gear heat shield to the steering gear.
  20. Clean any excess power steering fluid from the vehicle and remove the drain pans.
  21. Install the intermediate steering shaft to the steering gear. Refer to Intermediate Steering Shaft Replacement .
  22. Install the steering linkage outer tie rods to the steering knuckles. Refer to Steering Linkage Outer Tie Rod Replacement .
  23. Fill and bleed the power steering system. Refer to Power Steering System Bleeding .
  24. Adjust the front toe. Refer to Front Toe Adjustment .

Steering Gear Replacement HPS with LZ4

Removal Procedure

    Notice: Secure the steering wheel utilizing a strap to prevent rotation. Locking of the steering column will prevent damage and a possible malfunction of the SIR system. The steering wheel must be secured in position before disconnecting the following components:

       • The steering column
       • The intermediate shaft
       • The steering gear
    After disconnecting these components, do not move the front tires and wheels. Failure to follow these procedures may cause improper alignment of some components during installation and result in possible damage to the SIR coil.

  1. Turn the front wheels to the straight forward position and secure the steering wheel from moving.
  2. Remove as much power steering fluid from the remote power steering fluid reservoir as possible.
  3. Place drain pans under the vehicle as needed.
  4. Disengage the steering linkage outer tie rods from the steering knuckles. Refer to Steering Linkage Outer Tie Rod Replacement.
  5. Separate the intermediate steering shaft from the steering gear. Refer to Intermediate Steering Shaft Replacement.

  6. Object Number: 1812202  Size: SH
  7. Loosen the rear transmission mount bracket bolt.
  8. Disconnect the heated oxygen sensor (HO2S) electrical connector and unclip it from the rear transmission mount bracket.

  9. Object Number: 1975906  Size: SH
  10. Remove the 3 transmission rear mount bolts (1).
  11. Remove the 3 rear transmission mount bracket nuts.
  12. Position the transmission rear mount and bracket aside.

  13. Object Number: 1812254  Size: SH
  14. Remove the power steering gear inlet hose bolt and disconnect the power steering gear inlet hose and the power steering gear outlet hose from the steering gear.

  15. Object Number: 1813904  Size: SH
  16. Remove the power steering gear outlet hose retainer from the right side rear of the frame.
  17. Important: Convertible vehicles utilize a cross brace that is installed by sharing the rear front frame mounting bolts. With the rear front frame bolts removed, the cross brace can be moved to gain access to the steering gear bolts.

  18. If working on a convertible vehicle, support the rear of the front frame with a suitable jack stand.
  19. If working on a convertible vehicle, remove the rear front frame bolts.
  20. Remove the steering gear bolts, nuts, and washers from the steering gear.
  21. Important: The position of the steering gear will need to be manipulated to remove it through the left front wheel opening.

  22. Remove the steering gear bolts, nuts, and washers from the steering gear.
  23. Transfer any parts as needed.

Installation Procedure

  1. Install the steering gear through the left front wheel opening.
  2. Notice: Refer to Fastener Notice in the Preface section.

    Important: Start all of the bolts and nuts by hand before finalizing any torques.

  3. Install the steering gear bolts, nuts, and washers to the steering gear.
  4. Tighten
    Tighten the bolts and nuts to 110 N·m (81 lb ft).

  5. For convertible vehicles, install the rear front frame bolts.
  6. Tighten
    Tighten the bolts to 100 N·m (73 lb ft) plus an additional 180 degree rotation.

  7. For convertible vehicles, remove the jack stand.

  8. Object Number: 1813904  Size: SH
  9. Install the power steering gear outlet hose retainer to the right side rear of the frame.

  10. Object Number: 1812254  Size: SH
  11. Connect the power steering gear inlet hose and the power steering gear outlet hose to the steering gear and install the power steering gear inlet hose bolt.
  12. Tighten
    Tighten the bolt to 27 N·m (20 lb ft).

  13. Position the transmission rear mount and bracket in place.
  14. Install the 3 rear transmission mount bracket nuts.
  15. Tighten
    Tighten the nuts to 50 N·m (37 lb ft).


    Object Number: 1975906  Size: SH
  16. Install the 3 transmission rear mount bolts (1).
  17. Tighten
    Tighten the bolts to 90 N·m (66 lb ft).

  18. Connect the HO2S electrical connector and clip it to the rear transmission mount bracket.

  19. Object Number: 1812202  Size: SH
  20. Tighten the rear transmission mount bracket bolt.
  21. Tighten
    Tighten the bolt to 90 N·m (66 lb ft).

  22. Clean any excess power steering fluid from the vehicle and remove the drain pans.
  23. Install the intermediate steering shaft to the steering gear. Refer to Intermediate Steering Shaft Replacement.
  24. Install the steering linkage outer tie rods to the steering knuckles. Refer to Steering Linkage Outer Tie Rod Replacement.
  25. Fill and bleed the power steering system. Refer to Power Steering System Bleeding.
  26. Adjust the front toe. Refer to Front Toe Adjustment .