Operation CHARM
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GMC Truck
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1992
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Suburban 3/4 Ton 4WD V8-350 5.7L
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Repair and Diagnosis
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Transmission and Drivetrain
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Relays and Modules - Transmission and Drivetrain
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Relays and Modules - A/T
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Control Module
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Description and Operation
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Combined Ratio
Combined Ratio
The combined ratio is the combination of both overdrive ratio and drive ratio. The PCM/TCM interprets this as total or box ratio.