RAM 3500 Truck 4WD L6-5.9L DSL Turbo VIN C (2002)
transmission's internal condition within a range of 57 - 94 psi (except in REVERSE) (Fig. 245). The regulated line pressure in REVERSE (Fig. 246) is
held at much higher pressures than in the other gear positions: 145-280 psi. The higher pressure for REVERSE is achieved by the manual valve blocking
the supply of line pressure to the reaction area left of land #4. With this pressure blocked, there is less area for pressure to act on to balance the force of
the spring on the right. This allows line pressure to push the valve train to the right, reducing the amount of fluid returned to the pump's inlet, increasing
line pressure.
KICKDOWN VALVE
When the throttle valve is as far over to the left as it can go, the maximum line pressure possible will enter the throttle pressure circuit. In this case,
throttle pressure will equal line pressure. With the kickdown valve (Fig. 247) pushed into the bore as far as it will go, fluid initially flows through the
annular groove of the 2-3 shift valve (which will be in the direct drive position to the right).
After passing the annular groove, the fluid is routed to the spring end of the 2-3 shift valve. Fluid pressure reacting on the area of land #1 overcomes
governor pressure, downshifting the 2-3 shift valve into the kickdown, or second gear stage of operation. The valve is held in the kickdown position by
throttle pressure routed from a seated check ball (#2). Again, if vehicle speed is low enough, throttle pressure will also push the 1-2 shift valve left to seat
its governor plug, and downshift to drive breakaway.
