GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 21426 Vacuum Modulator Wrench


    Object Number: 181666  Size: SH
  1. Install the modulator valve sleeve (114) small end first. The tab must engage the slot in the modulator valve bore.
  2. Install the modulator valve (115).
  3. Install the modulator valve plunger (116).
  4. Install a new seal (117) onto the vacuum modulator (118).

  5. Object Number: 181667  Size: SH

    Notice: Use of another tool to remove the vacuum modulator may result in internal damage to the modulator.

  6. Install the vacuum modulator (118) into the transmission case using J 21426 .
  7. Tighten
    Tighten the vacuum modulator (118) to 52 N·m (38 lb ft).

    Refer to Fastener Notice .