GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 HHR 🢒 Engine 🢒 Engine Electrical 🢒 Transmission Mount Replacement - Left Side

Removal Procedure
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

    3. Object Number: 1497621 Size: SH
  3. Remove the front transmission mount thru bolt.

    4. Object Number: 851620 Size: SH
  4. Remove the rear transmission mount thru bolt.
  5. Lower the vehicle.
  6. Remove the underhood electrical center cover.

    7. Object Number: 873343 Size: SH
  7. Disconnect the engine control module harness connector  (3, 4).
  8. Disconnect the positive battery cables  (1) from the under hood electrical center.

    9. Object Number: 1720487 Size: SH
  9. Remove the underhood electrical center tray bracket nuts  (1) and bolt  (2).
  10. Disconnect the wiring harness retainer from the tray bracket.

    11. Object Number: 888342 Size: SH
  11. Lift the electrical center up and swing it back and out of the way.

    12. Object Number: 851552 Size: SH
  12. Support the transmission with an hydraulic floor jack. Use a block of wood between the jack and the transmission.

    13. Object Number: 851556 Size: SH
  13. Remove the transmission mount to transmission bolts.

    14. Object Number: 851557 Size: SH
  14. Remove the transmission mount to mid-rail bolts.

    15. Object Number: 851552 Size: SH
  15. Using the floor jack, slowly lower the transmission just enough to remove the transmission mount from the vehicle.

Installation Procedure

    Object Number: 851557 Size: SH
  1. Install the transmission mount to the mid-rail.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Hand start the transmission mount to mid-rail bolts.

    3. Tighten
    Tighten the bolts to 34 N·m (25 lb ft).


    Object Number: 851552 Size: SH
  3. Using a hydraulic jack, raise the transmission until it contacts the transmission mount.

    4. Object Number: 851556 Size: SH

    Important: The transmission mount to transmission bolts must be hand started. Do not pry the transmission or mount to align the holes.

  4. Hand start the transmission mount to transmission bolts using the following sequence:
    5. 4.1. Rear Bolt
    4.2. Middle Bolt
    4.3. Front Bolt
  5. Using the previous sequence, tighten the transmission mount bolts.

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

  6. Reposition the underhood electrical center.
  7. Connect the wiring harness retainer to the tray bracket.

    8. Object Number: 1720487 Size: SH
  8. Install the electrical center nuts  (1) and bolts  (2).

    9. Tighten

        • Tighten the nut to 10 N·m (89 lb in).
        • Tighten the bolt to 25 N·m (18 lb ft).

    Object Number: 873343 Size: SH
  9. Install the positive battery cables (1) to the underhood electrical center.

    10. Tighten
    Tighten the positive cable nut to 15 N·m (11 lb ft).

  10. Connect the engine control module harness connectors  (3, 4).
  11. Install the underhood electrical center cover.
  12. Raise the vehicle.

    13. Object Number: 851568 Size: SH
  13. Hand tighten the front transmission mount thru bolt
  14. Hand tighten the rear transmission mount thru bolt.
  15. Tighten the front transmission mount thru bolt.

    16. Tighten
    Tighten the bolt to 100 N·m (74 lb ft).


    Object Number: 851620 Size: SH
  16. Tighten the rear transmission mount thru bolt.

    17. Tighten
    Tighten the bolt to 100 N·m (74 lb ft).

  17. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .