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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1035 (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 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis 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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