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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 920 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Diagnostic Information And Procedures >> Road Test >> Manual 2-1 Downshift

Manual 2-1 Downshift

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Place the shift selector in DRIVE.
  2. Accelerate the vehicle until the 1-2 shift occurs.
  3. Go to 8 km/h (5 mph) above the 1-2 shift point.
  4. Release the throttle while moving the shift selector to FIRST.
  5. Verify the following conditions:
    • The TCC releases.
    • The transmission immediately downshifts to FIRST range.
    • The engine slows the vehicle.
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