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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Rear Servo
Rear Servo
The rear servo applies the rear
band
for overrun engine braking in low range 1st gear. It applies the ban in Reverse to hold the reaction carrier to provide reverse gear ratio.