GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Avalanche - 4WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L80-E/4L85-E 🢒 Input Speed Sensor Replacement

Removal Procedure

    Object Number: 859361 Size: SH
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Disconnect the input speed sensor electrical connector (1).

    3. Object Number: 686957 Size: SH
  3. Remove the input speed sensor bolt.
  4. Remove the input speed sensor (1).
  5. Inspect the input speed sensor (1) for any evidence of damage.

Installation Procedure

    Object Number: 686957 Size: SH
  1. Lubricate the input speed sensor seal with automatic transmission fluid.
  2. Install the input speed sensor (1).

    3. 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.

  3. Install the input speed sensor bolt.

    4. Tighten
    Tighten the bolt to 11 N·m (96 lb in).


    Object Number: 859361 Size: SH
  4. Connect the input speed sensor electrical connector (1).
  5. Lower the vehicle.