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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission - Overhaul - 4L80-E >> Trouble Shooting >> Symptom Diagnosis >> Oil Out Of Vent Or Foaming

Oil Out Of Vent Or Foaming

Transmission overfilled. Oil contaminated with antifreeze or engine overheating. Filter not seated. Cross-channel leak causing pressurize in vent area of pump cover.

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