RAM 3500 HD Truck 2WD L6-6.7L DSL Turbo (2008)
Regulator Valve in Neutral Position
Meanwhile, the torque converter is filled slowly. In all other gear positions, fluid flows between two right side lands to the switch valve and torque
converter. At low pump speeds, the flow is controlled by the pressure valve groove to reduce pressure to the torque converter. After the torque converter
and switch valve fill with fluid, the switch valve becomes the controlling metering device for torque converter pressure. The regulator valve then begins
to control the line pressure for the other transmission circuits. The balance of the fluid pressure pushing the valve to the right and the spring pressure
pushing to the left determines the size of the metering passage at land #2 (land #1 being at the far right of the valve in the diagram). As fluid leaks past
the land, it moves into a groove connected to the filter or sump. As the land meters the fluid to the sump, it causes the pressure to reduce and the spring
decreases the size of the metering passage. When the size of the metering passage is reduced, the pressure rises again and the size of the land is increased
again. Pressure is regulated by this constant balance of hydraulic and spring pressure.
Regulator Valve in Drive Position
The metering at land #2 establishes the line pressure throughout the transmission. It is varied according to changes in throttle position and the
transmission's internal condition within a range of 57-94 psi (except in REVERSE).
