Operation CHARM
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GMC Truck
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1992
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K 2500 Truck 4WD V6-262 4.3L VIN Z
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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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4L80-E Automatic Transmission
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Inputs
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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.