Operation CHARM
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GMC Truck
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1989
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C 2500 Truck 2WD V8-379 6.2L DSL VIN C FI
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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
Turbo Hydra-Matic 3L80 & 3L80HD (400 & 475)
Turbo Hydra-Matic 4L60 (700-R4)
Auxiliary Valve Body Replace
Control Valve Assembly Replace
Specifications
TH 400 (3L80) & 475 (3L80HD)
4L60 - 700R4 Transmission
Technical Service Bulletins
