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GMC Truck
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1989
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S15/T15 2WD P/U 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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No Forced Downshifts
No Forced Downshifts
1. Detent cable broken or improperly adjusted.
2. Stuck detent pressure regulator valve.