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GMC Truck
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1986
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G 2500 3/4 Ton Van V8-379 6.2L DSL
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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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3L80/3L80HD (400/475) Automatic Transmission
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Rough 2-3 Shift
Rough 2-3 Shift
If this condition is encountered, refer to "Harsh 1-2 & 2-3 Shifts".
1. Items 1, 2 and 3 under Rough 1-2 Shift will also cause rough 2-3 shift.
2. Front servo accumulator spring broken or missing. Accumulator piston
may be sticking.