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GMC Truck
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1988
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G 3500 1 Ton Van V8-454 7.4L
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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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No Detent Downshifts
No Detent Downshifts
1. Detent switch needs fuse, connections tightened or adjustment.
2.
Detent solenoid
may be inoperative.
3. Detent valve train in control valve assembly malfunctioning.