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Home >> Chevrolet >> 2023 >> Camaro ZL1, 2D Convertible, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Automatic Transmission - 10L60, 10L80 Or 10L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Road Test >> Manual Downshifts

Manual Downshifts

WARNING: This page is about a different variant/trim than selected.

Manual downshift testing is not required since all vehicles equipped with the 10R90 are also equipped with some form of Driver Shift Control (DSC). The TCM will automatically override DSC downshifts to protect the transmission from damage.

Coasting Downshifts

  1. Place the gear selector in the DRIVE position.
  2. Accelerate the vehicle to 10th gear with the TCC applied.
  3. Release the throttle and apply the brakes.
  4. Verify that the downshifts occur as commanded by monitoring gear ratio, which should change after commanded gear changes.
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