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GMC Truck
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1988
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S15/T15 4WD Jimmy L4-151 2.5L
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Repair and Diagnosis
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Transmission and Drivetrain
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Automatic Transmission/Transaxle
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Testing and Inspection
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Symptom Related Diagnostic Procedures
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3L30 (180/180C) Automatic Transmission
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Engine Flare on High Speed Forced Downshift
Engine Flare on High Speed Forced Downshift
1. Low fluid pressure.
2. Loose
band
adjustment.
3. High speed downshift timing valve stuck in closed position.
4. Sprag race does not engage on 3-1 downshift.