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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission Overhaul - 4L80-E >> Trouble Shooting >> Symptom Diagnosis >> Late 1-2 Shift

Late 1-2 Shift

Problem with input and/or output speed sensor(s). Faulty Digital Ratio Adapter (DRAC on 2WD only). Incorrect PROM calibration.

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