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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1355 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Diagnostic Information And Procedures >> Road Test >> Coasting Downshifts

Coasting Downshifts

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 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 SIXTH range with the TCC applied.
  3. Release the throttle and lightly apply the brakes.
  4. Verify the following conditions:
    • The TCC releases.
    • Downshifts occur in normal sequence and the transmission returns to FIRST range before the vehicle comes to a stop.
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