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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Automatic Transaxle - 4T80-E - Service, Diagnosis & Troubleshooting) >> Road Test >> Full Throttle Detent Downshift

Full Throttle Detent Downshift

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  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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