Operation CHARM
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GMC Truck
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1989
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C 2500 Truck 2WD V8-350 5.7L
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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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Description and Operation
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3L80/3L80HD (400/475) Automatic Transmission
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Power Flow
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Intermediate Selector Position
Intermediate Selector Position
The manually selected intermediate position adds increased performance for hilly terrain and provides engine braking.