RAM 3500 Truck 4WD L6-6.7L DSL Turbo (2008)
governor plug will push the valve over far enough to bottom the valve in its bore. This allows land #2 to direct line pressure to the front clutch.
After the shift, line pressure is directed to the release side of the kickdown servo. This releases the front band and applies the front clutch, shifting into
third gear or direct drive. The rear clutch remains applied, as it has been in the other gears. During a manual "1" or manual "2" gear selection, line
pressure is sent between the two lands of the 2-3 governor plug. This line pressure at the governor plug locks the shift valve into the second gear
position, preventing an upshift into direct drive. The theory for the blocking of the valve is the same as that of the 1-2 shift valve.
If the manual "2" or manual "1" gear position is selected from the drive position, the PCM will control the timing of the downshift by targeting for a high
governor pressure. When a safe vehicle speed is reached, the PCM will switch to its normal control governor curve and the downshift will occur.
3-4 SHIFT VALVE
3-4 Shift Valve Before Shift
The PCM energizes the overdrive solenoid during the 3-4 upshift. This causes the solenoid check ball to close the vent port allowing line pressure from
the 2-3 shift valve to act directly on the 3-4 upshift valve.
