Diesel Data
: Automotive Repair
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Chevy Truck
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1983
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K 20 3/4 Ton Pickup 4WD L6-292 4.8L VIN T 1-bbl
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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 Part Throttle Downshifts
No Part Throttle Downshifts
1. Vacuum modulator assembly.
2. Modulator valve.
3. Regulator valve train.
4. Control valve assembly has stuck 3-2 valve or broken spring.