Operation CHARM
: Car repair manuals for everyone.
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Chevrolet
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1989
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C 1500 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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Hydraulic System, Brakes
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Functions of Valves & Hydraulic Control Units
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1-2 Shift Valve
1-2 Shift Valve
Controls the speed at which the 1-2 and 2-1 shifts occur.