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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> Road Test Procedure >> Manual Gear Range Selection >> Manual First

Manual First

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the vehicle stopped, move the gear selector to FIRST.
  2. Accelerate the vehicle to 32 km/h (20 mph).
  3. Verify the following:
    • No upshifts occur.
    • The TCC does not apply.
    • There is no noticeable slip, noise, or vibration.
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