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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 >> Coasting Downshifts

Coasting 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 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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