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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> 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 Downshifts

Manual Downshifts

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 to obtain SIXTH range.
  3. Place the shift selector in RANGE SELECTION MODE (M).
  4. By pressing the "+/-" button on the shift selector select the desired preselect range.
  5. Release the throttle.
  6. Verify the following conditions:
    • The TCC releases.
    • The transmission downshifts immediately to the preselected range. Downshifts will occur in sequence to the preselect range.
    • The engine slows the vehicle.
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