Operation CHARM
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GMC Truck
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1988
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Suburban 3/4 Ton 4WD 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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Description and Operation
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3L80/3L80HD (400/475) Automatic Transmission
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Power Flow
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Intermediate Range
Intermediate Range
The manually selected intermediate position adds increased performance for hilly terrain and provides engine braking.