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Hummer
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2008
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H3 Adventure, Automatic
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Repair and Diagnosis
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Transmission
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Hydraulic Diagrams
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Automatic Transmission - 4L60-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis
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Description & Operation
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Overdrive Range, 4-3 Downshift
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1-2 Shift Valve
1-2 Shift Valve
As in Fourth gear, D432 fluid pressure and spring force hold the valve in the upshift position.