GM Service Manual Online
For 1990-2009 cars only

    Important: Follow the balance procedure in the order listed in the following steps. Powertrain mounts must be tightened in sequence.

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Position two floor jacks with wood blocks under the engine and transmission to support the powertrain assembly.

  3. Object Number: 851556  Size: SH
  4. From the engine compartment, loosen the transmission mount to transmission bolts.

  5. Object Number: 851553  Size: SH
  6. Loosen the engine mount to intermediate bracket bolts.

  7. Object Number: 851568  Size: SH
  8. Loosen the front transmission mount through bolt. Do not remove.

  9. Object Number: 851620  Size: SH
  10. Loosen the rear transmission mount through bolt. Do not remove.
  11. Loosen the rear transmission mount to cradle bolts.
  12. Reposition the floor jacks to allow a 1/8 inch gap between the mount and mount bracket.

  13. Object Number: 1770674  Size: SH
  14. Ensure the front transmission mount is centered in the front clevis on the cradle.
  15. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 851556  Size: SH
  16. Tighten the transmission mount to transmission bolts using the following sequence:
  17. 10.1. Rear bolt
    10.2. Middle bolt
    10.3. Front Bolt

    Tighten
    Tighten the bolts to 50 N·m (37 lb ft).


    Object Number: 851553  Size: SH
  18. Tighten the engine mount to intermediate bracket bolts starting with the center bolt.
  19. Tighten
    Tighten the bolts to 50 N·m (37 lb ft).

  20. Ensure the rear transmission mount bracket is seated on the transmission housing.
  21. Center the rear transmission mount in the rear cradle clevis.
  22. Tighten the rear transmission mount to cradle bolts.
  23. Tighten
    Tighten the bolts to 50 N·m (37 lb ft).

  24. Remove the floor jacks.
  25. Shake the powertrain vigorously from front to rear and allow the powertrain to settle.

  26. Object Number: 851620  Size: SH
  27. Tighten the rear transmission mount through bolt.
  28. Tighten
    Tighten the bolts to 110 N·m (81 lb ft).


    Object Number: 851568  Size: SH
  29. Tighten the front transmission mount through bolt.
  30. Tighten
    Tighten the bolts to 110 N·m (81 lb ft).

  31. Lower the vehicle.