Dodge Ram Truck 1500-2500-3500. Manual — part 1803
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3-4 shift valve
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3-4 timing valve
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3-4 quick fill valve
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3-4 accumulator
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Converter clutch lock-up valve
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Converter clutch lock-up timing Valve
Lower Housing Shift Valves and Springs
1 - 3-4 ACCUMULATOR HOUSING
11 - TIMING VALVE COVER
2 - 3-4 SHIFT VALVE AND SPRING
12 - PLUG
3 - PLUG
13 - 3-4 TIMING VALVE AND SPRING
4 - SPRING RETAINER
14 - LOWER HOUSING
5 - CONVERTER CLUTCH VALVE AND SPRING
15 - ACCUMULATOR END PLATE
6 - CONVERTER CLUTCH TIMING VALVE AND SPRING
16 - 3-4 ACCUMULATOR PISTON AND SPRING
7 - OVERDRIVE SEPARATOR PLATE
17 - E-CLIP
8 - CASE CONNECTOR
18 - 3-4 QUICK FILL SPRING AND VALVE
9 - CONVERTER CLUTCH SOLENOID
19 - SOLENOID GASKET
10 - OVERDRIVE SOLENOID
20 - HARNESS
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AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION
DR/DH
OPERATION
NOTE: Refer to the Hydraulic Schematics for a visual aid in determining valve location, operation and
design.
CHECK BALLS
CHECK BALL NUMBER
DESCRIPTION
1
Allows either the manual valve to put line pressure on the 1-2 governor plug or
the KD Valve to put WOT line pressure on the 1-2 governor plug.
3
Allows either the Reverse circuit or the 3rd gear circuit to pressurize the front
clutch.
4
Allows either the Manual Low circuit from the Manual Valve or the Reverse
from the Manual Valve circuit to pressurize the rear servo.
5
Directs line pressure to the spring end of the 2-3 shift valve in either Manual
Low or Manual 2nd, forcing the downshift to 2nd gear regardless of governor
pressure.
6
Provides a by-pass around the front servo orifice so that the servo can release
quickly.
7
Provides a by-pass around the rear clutch orifice so that the clutch can release
quickly.
8
Directs reverse line pressure through an orifice to the throttle valve eliminating
the extra leakage and insuring that Reverse line pressure pressure will be
sufficient.
9
Provides a by-pass around the rear servo orifice so that the servo can release
quickly.
10
Allows the lockup clutch to used at WOT in 3rd gear by putting line pressure
from the 3-4 Timing Valve on the interlock area of the 2-3 shift valve, thereby
preventing a 3rd gear Lock-up to 2nd gear kickdown.
DR/DH
AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION
21 - 1145
REGULATOR VALVE
The pressure regulator valve is needed to control the hydraulic pressure within the system and reduce the amount
of heat produced in the fluid. The pressure regulator valve is located in the valve body near the manual valve. The
pressure regulator valve train controls the maximum pressure in the lines by metering the dumping of fluid back into
the sump. Regulated pressure is referred to as “line pressure.”
The regulator valve has a spring on one end that pushes the valve to the left. This closes a dump (vent) that is
used to lower pressure. The closing of the dump will cause the oil pressure to increase. Oil pressure on the oppo-
site end of the valve pushes the valve to the right, opening the dump and lowering oil pressure. The result is spring
pressure working against oil pressure to maintain the oil at specific pressures. With the engine running, fluid flows
from the pump to the pressure regulator valve, manual valve, and the interconnected circuits. As fluid is sent
through passages to the regulator valve, the pressure pushes the valve to the right against the large spring. It is
also sent to the reaction areas on the left side of the throttle pressure plug and the line pressure plug. With the gear
selector in the PARK position, fluid recirculates through the regulator and manual valves back to the sump.
Regulator Valve in Park Position
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AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION
DR/DH
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 Neutral Position
DR/DH
AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION
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