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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1736 (AUTOMATIC TRANSMISSION - MU4)REPAIR INSTRUCTIONSPARK/NEUTRAL POSITION SWITCHINSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the PNP switch to the transaxle. Secure with 2 bolts. Do NOT tighten fully.
  2. Install a new lock plate (1) and the manual shaft nut (3) onto the PNP switch.

    Tighten 

    Tighten the manual shaft nut to 5.5 N.m (49 lb in).

    Fig 1: Installing New Lock Plate And Manual Shaft Nut Onto PNP Switch
    G03415444Courtesy of GENERAL MOTORS CORP.
  3. Temporarily install the manual lever.
  4. Turn the lever counterclockwise until it stops, then turn it clockwise 2 notches.
    Fig 2: Turning Lever Counterclockwise Until It Stops & Turning It Clockwise 2 Notches
    G03415445Courtesy of GENERAL MOTORS CORP.
  5. Remove the manual lever.
  6. Align the groove (1) with the neutral base line (2).
  7. Hold the switch in position, then tighten the 2 bolts.

    Tighten 

    Tighten the Park/Neutral Position (PNP) switch bolts to 5.5 N.m (49 lb in).

    Fig 3: Aligning Groove With Neutral Base Line
    G03415446Courtesy of GENERAL MOTORS CORP.
  8. Stake the lock plate over the manual shaft nut.
  9. Install the manual lever onto the manual shaft. Secure the manual lever with 1 lock washer and nut.

    Tighten 

    Tighten the manual lever nut to 12.5 N.m (9 lb ft).

  10. Install the PNP shift electrical connector to the PNP switch.
    Fig 4: Staking Lock Plate Over Manual Shaft Nut
    G03415447Courtesy of GENERAL MOTORS CORP.
  11. Install the shift select cable and nut to the manual lever.

    Tighten 

    Tighten the shift cable retaining nut to 12.5 N.m (9 lbs ft).

  12. Install the shift select cable in the retaining bracket (2), then install the clip (3).
  13. Install the battery tray in the vehicle, then the 4 battery tray retaining bolts.

    Tighten 

    Tighten the bolts to 13 N.m (10 lbs ft).

  14. Install the battery. Refer to BATTERY REPLACEMENT in Engine Electrical.
  15. Apply the parking brake and block the vehicle wheels.
    Fig 5: Installing Shift Select Cable In Retaining Bracket And Clip
    G03415448Courtesy of GENERAL MOTORS CORP.
  16. With the manual selector in Park position, turn the ignition switch to START and verify that the starter motor operates.
  17. Stop the engine and return the ignition switch to the ON position.
  18. Move the manual selector from the Park position to the Neutral position and verify that the starter motor operates.
  19. Verify that the starter motor DOES NOT operate in D, 2, L or R.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.