GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • J 39630-1 Lower Control/Valve Body Gasket Guide Pins
    • J 39630-2 Lower Control/Valve Body Gasket Guide Pins
    • DT-47707-R1 Internal Mode Switch Alignment Tool

For equivalent regional tools, refer to Special Tools.


    Object Number: 1217572  Size: SH
  1. Install the lower control valve body (903) over the J 39630-2 guide pins .
  2. Caution: Refer to Fastener Caution in the Preface section.

  3. Position the solenoid valve fluid filter retainer (981) onto the lower control valve body (903) and install some of the valve body bolts (938, 940, 941) and hand tighten them.
  4. Remove the J 39630-2 guide pins and tighten the bolts (938, 940, 941) in a star pattern to 8-14 N·m (6-10 lb ft).

  5. Object Number: 1580440  Size: SH
  6. Position the DT-47707-R1 alignment tool onto the lower control valve body, next to the 2-3 shift solenoid valve, and install the two J 39630-1 guide pins .
  7. Note: Hold the IMS (942) against the DT-47707-R1 alignment tool while tightening the bolts.

  8. Locate the internal mode switch (IMS) (942) against the DT-47707-R1 alignment tool , install the three 8 mm bolts (939) and tighten to 8-14 N·m (6-10 lb ft).
  9. Remove the DT-47707-R1 alignment tool and the J 39630-1 guide pins .

  10. Object Number: 1580441  Size: SH
  11. Install the remaining bolts (941) into the lower control valve body (903) and tighten to 8-14 N·m (6-19 lb ft).

  12. Object Number: 1580442  Size: SH
  13. Connect the lower control valve body wire harness (943) to the following parts:
  14. • 1-2 shift solenoid valve (909)
    • 2-3 shift solenoid valve (910)
    • Internal mode switch (IMS) (942)