RAM 1500 Truck 2WD V6-3.9L VIN X (1999)
Valve Body: Description and Operation
Shift Valve Operation
The shift valves are moved by a combination of throttle and governor pressure. The governor pressure is generated by electrical components.
The conditions under which a shift to fourth will not occur are:
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Overdrive switch is Off
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Transmission fluid temperature is below 10 °C (50 °F) or above 121 °C (250 °F)
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Shift to third not yet completed
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Vehicle speed too low for 3-4 shift to occur
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Battery temperature below -5 °F.
