GM Service Manual Online
For 1990-2009 cars only

Steering Gear Replacement Electronic Power Steering (EPS)

Removal Procedure

  1. Turn the steering wheel to the straight forward position, support it from movement, and remove the key from the ignition.
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  3. Remove the front tires and wheels. Refer to Tire and Wheel Removal and Installation .

  4. Object Number: 851655  Size: SH
  5. Remove the intermediate shaft to steering gear pinch bolt. Discard the bolt.
  6. Important: Secure the steering wheel in the straight forward position before separating the intermediate shaft from the steering gear, or damage to the SIR coil will occur.

  7. Separate the intermediate shaft from the steering gear.
  8. Remove the tie rod end castle nuts.

  9. Object Number: 643351  Size: SH

    Notice: Do not free the ball stud by using a pickle fork or a wedge-type tool. Damage to the seal or bushing may result.

  10. Using the J 24319-B , separate the tie rod ends from the steering knuckles.

  11. Object Number: 1770184  Size: SH
  12. Remove the rear transmission mount-to-transmission bolt.

  13. Object Number: 1229955  Size: SH
  14. Remove the steering gear to frame bolts.
  15. Remove the steering gear through the left side of the vehicle. Rotate the gear 90 degrees in order to clear the rear transmission mount.
  16. If replacing the steering gear, remove the outer tie rod ends. Refer to Rack and Pinion Outer Tie Rod End Replacement .

Installation Procedure

  1. Install the outer tie rod ends to the steering gear. Refer to Rack and Pinion Outer Tie Rod End Replacement .

  2. Object Number: 1229955  Size: SH
  3. Install the steering gear to the vehicle. Rotate the gear as necessary to clear the rear transmission mount.
  4. Notice: Refer to Fastener Notice in the Preface section.

  5. Install the steering gear to frame bolts.
  6. Tighten
    Tighten the bolts to 70 N·m (52 lb ft) plus an additional 90 degrees.


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


    Object Number: 851655  Size: SH
  9. Connect the intermediate steering shaft to the steering gear as noted during removal.
  10. Install the new intermediate steering shaft to steering gear pinch bolt.
  11. Tighten
    Tighten the bolt to 49 N·m (36 lb ft).

  12. Position the outer tie rod ends into the steering knuckles.
  13. Important: Hold the ball stud from turning during installation of the castle nut.

  14. Install new torque castle nuts to the tie rod end ball studs.
  15. Tighten
    Tighten the castle nuts to 25 N·m (18 lb ft) plus 90 degrees.

  16. Install the front tires and wheels. Refer to Tire and Wheel Removal and Installation .
  17. Lower the vehicle.
  18. Measure the wheel alignment and adjust as necessary. Refer to Wheel Alignment Measurement .

Steering Gear Replacement Hydraulic Power Steering (HPS)

Tools Required

Universal Steering Linkage and Tie Rod Puller

Removal Procedure

  1. Turn the steering wheel to the straight forward position, support it from movement, and remove the key from the ignition.
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  3. Remove the front tires and wheels. Refer to Tire and Wheel Removal and Installation .
  4. Remove the tie rod end castle nuts.

  5. Object Number: 643351  Size: SH
  6. Using the J 24319-B , separate the tie rod ends from the steering knuckles.

  7. Object Number: 1775856  Size: SH
  8. Remove the intermediate shaft to steering gear pinch bolt (1). Discard the bolt.
  9. Important: Secure the steering wheel in the straight forward position before separating the intermediate shaft from the steering gear, or damage to the SIR coil will occur.

  10. Separate the intermediate shaft (2) from the steering gear (3).

  11. Object Number: 1812202  Size: SH
  12. Loosen the transaxle mount through bolt.
  13. Disconnect the heated oxygen sensor (HO2S) electrical connector.
  14. Disconnect the HO2S sensor harness from the transmission mount bracket.
  15. Remove the 3 transaxle mount to transaxle bolts.

  16. Object Number: 1812229  Size: SH
  17. Remove the 3 transaxle bracket to cradle/frame nuts.
  18. Position the transaxle bracket and rear mount aside.

  19. Object Number: 1775901  Size: SH
  20. Remove the bolt (1) and disconnect the power steering gear inlet (2) and outlet (4) pipe/hoses from the power steering gear (3). Cap off the pipe/hoses and position aside.

  21. Object Number: 1813904  Size: SH
  22. Remove the power steering gear outlet pipe routing pin-style retainer from the RH rear side of the cradle/frame.
  23. Remove the power steering gear mounting bolts, nuts, and washers from the gear.
  24. Important: The power steering gear will need to be rotated while it is removed through the LH wheel opening.

  25. Remove the power steering gear through the LH wheel opening.
  26. If the power steering gear is to be replaced, transfer the outer tie rod ends to the new steering gear.

Installation Procedure

    Important: The power steering gear will need to be rotated while it is installed through the LH wheel opening.

  1. Position the power steering gear into the vehicle.
  2. Connect the intermediate steering shaft to the steering gear.
  3. Notice: Refer to Fastener Notice in the Preface section.

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


    Object Number: 1813904  Size: SH
  6. Install the power steering gear outlet pipe routing pin-style retainer to the RH rear side of the cradle/frame.

  7. Object Number: 1775901  Size: SH
  8. Connect the power steering gear inlet (2) and outlet (4) pipe/hoses to the power steering gear (3) and install the bolt (1).
  9. Tighten
    Tighten the pipe/hose to power steering gear bolt to 27 N·m (20 lb ft).


    Object Number: 1775856  Size: SH
  10. Install the new intermediate steering shaft to steering gear pinch bolt (1).
  11. Tighten
    Tighten the pinch bolt to 49 N·m (36 lb ft).

  12. Position the transaxle bracket and rear mount back to their original position.

  13. Object Number: 1812229  Size: SH
  14. Install the 3 transaxle bracket to cradle/frame nuts.
  15. Tighten
    Tighten the transaxle bracket to cradle/frame nuts to 50 N·m (37 lb ft).

  16. Install the 3 transaxle mount to transaxle bolts.
  17. Tighten
    LZ4 Engines: Tighten the transaxle mount bolts to 90 N·m (66 lb ft).

    Tighten
    LZ9 Engines: Tighten the transaxle mount bolts to 50 N·m (37 lb ft).

  18. Connect the HO2S sensor harness to the transmission mount bracket.
  19. Connect the heated oxygen sensor (HO2S) electrical connector.

  20. Object Number: 1812202  Size: SH
  21. Tighten the transaxle mount through bolt.
  22. Tighten
    LX4 Engines: Tighten the transaxle mount bolts to 90 N·m (66 lb ft).

    Tighten
    LZ9 Engines: Tighten the transaxle mount bolts to 50 N·m (37 lb ft).

  23. Position the outer tie rod ends into the steering knuckles.
  24. Important: Hold the ball stud from turning during installation of the castle nut.

  25. Install new torque castle nuts to the tie rod end ball studs.
  26. Tighten
    Tighten the castle nuts to 60 N·m (44 lb ft).

  27. Install the front tires and wheels. Refer to Tire and Wheel Removal and Installation .
  28. Lower the vehicle.
  29. Fill and bleed the power steering system. Refer to .
  30. Measure the wheel alignment and adjust as necessary. Refer to Power Steering System Bleeding .