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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 35 (Automatic Transmission - ALLISON - Service, Diagnosis & Troubleshooting) >> Road Test Procedure >> Part Throttle Detent Downshift

Part Throttle Detent Downshift

WARNING: This page is about a different variant/trim than selected.
  1. Place the shift selector in DRIVE.
  2. Accelerate the vehicle to a speed just above the FOURTH to FIFTH shift point, using less than 50 percent throttle.
  3. Quickly increase throttle angle to greater than 63 percent.
  4. Verify the following conditions:
    • The TCC releases.
    • The transmission downshifts immediately to FOURTH range.
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