GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 GMC C Sierra - 2WD 🢒 General Information 🢒 Vibration Diagnosis and Correction 🢒 Transmission Mount Replacement

Removal Procedure

    Object Number: 339139 Size: SH

    Notice: Broken or deteriorated mounts can cause misalignment and destruction of certain drive train components. When a single mount breaks, the remaining mounts are subjected to abnormally high stresses.

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the nut holding the rear engine mount to the transmission support.

    3. Object Number: 339147 Size: SH
  3. Remove the mount to transmission bolts.
  4. Raise the transmission using a suitable transmission jack, just enough in order to permit the removal of the mount.

    5. Object Number: 339174 Size: SH
  5. Remove the mount.

Installation Procedure

    Object Number: 339174 Size: SH
  1. Install the mount.

    2. Object Number: 339147 Size: SH
  2. Loosely install the mount to transmission bolts.
  3. Lower the transmission.

    4. Object Number: 339139 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the nut holding the rear engine mount to the transmission support.

    5. Tighten

        • Tighten the nut to 45 N·m (33 lb ft).
        • Tighten the bolts to 50 N·m (37 lb ft).
  5. Lower the vehicle.