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Home >> Chevrolet >> 2011 >> Corvette ZR-1 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transmission - 6L80-E - Symptom Troubleshooting & Diagnosis) >> Road Test >> Part Throttle Step-In Downshifts

Part Throttle Step-In Downshifts

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  1. Place the gear selector in the DRIVE position.
  2. Accelerate the vehicle at light throttle (5-15 percent) until 3rd gear is just achieved.
  3. Quickly increase throttle angle until commanded gear indicates that a downshift to 2nd gear is commanded.
  4. Verify that the transmission downshifts within 2 seconds of the throttle movement.
  5. Repeat steps 2 to 4 at higher speed to achieve 4th gear and then step in to command a 4th gear to 3rd gear downshift.
  6. Repeat steps 2 to 4 at higher speed to achieve 5th gear and then step in to command a 5th to 4th gear downshift.
  7. Repeat steps 2 to 4 at higher speed to achieve 6th gear and then step in to command a 6th gear to 5th gear downshift.
  8. Note any harsh, soft or delayed shifts or slipping. Note any noise or vibration.
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