Operation CHARM
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GMC Truck
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1987
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G 1500 1/2 Ton Van 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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Valve Body
Valve Body
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Locations
3L30 (THM180/180C) Automatic Transmission
3L80/3L80-HD (THM 400/475) Automatic Transmission
4L60 (THM 700-R4) Automatic Transmission
Case Checkballs
Control Valve Body Checkballs
Service and Repair
Technical Service Bulletins