GM Service Manual Online
For 1990-2009 cars only

    Notice: In order to avoid oil pan damage and possible engine failure, insert a block of wood that spans the width of the oil pan bottom between the oil pan and the jack support.

    Important: Before replacing any transmission mount due to suspected fluid loss, verify that the source of the fluid is the transmission mount, not the engine, the transmission or the accessories.

  1. Raise the transmission in order to remove the weight from the transmission mount and create slight tension in the rubber.
  2. Observe the transmission mount while raising the transmission. Replace the transmission mount if you observe any of the following conditions:
  3. • The hard rubber surface is covered with heat check cracks.
    • The rubber is separated from the metal plate of the transmission mount.
    • The rubber is split through the center of the transmission mount.
  4. If you observe movement between the metal plate of the transmission mount and its attaching points, lower the transmission on the transmission mount. Tighten the bolts or nuts attaching the transmission mount to the frame or to the transmission mount bracket.
  5. For information on the engine mount, refer to Engine Mount Bracket Replacement in Engine Mechanical -- 3.1L or Engine Mount and Bracket Replacement in Engine Mechanical -- 3.8L.