GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Chevy P12 Chassis 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Transmission Modulator Replacement

Removal Procedure
  1. Disconnect the vacuum hose.

    2. Object Number: 201539 Size: SH
  2. Remove the bolt and clip securing the modulator and the O-ring to the transmission.
  3. Remove the modulator from the transmission.

Installation Procedure

    Object Number: 201539 Size: SH
  1. Install the modulator to the transmission.

    2. 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.

  2. Install the bolt and the clip in order to secure the modulator and the O-ring to the transmission.

    3. Tighten
    Tighten the bolt to 12 N·m (106 lb in).

  3. Connect the vacuum hose.