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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1123 (Automatic Transaxle, 4T65-E Diagnostics (Troubleshooting)) >> Troubleshooting >> Road Test Procedure >> Full Throttle Detent Downshift

Full Throttle Detent Downshift

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
  1. Place the gear selector in the OVERDRIVE position.
  2. Accelerate the vehicle to speeds of 64-88 km/h (40-55 mph) in FOURTH gear.
  3. Quickly increase throttle angle to 100 percent (WOT).
  4. Verify the following:
    • The TCC releases
    • The transmission downshifts immediately to SECOND gear
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