Dodge Dakota (R1). Manual — part 643
Fig. 262 Upper Housing Shift Valve and Pressure Plug Locations
1 - UPPER HOUSING
8 - RETAINER
2 - 1-2 SHIFT VALVE AND SPRING
9 - 1-2 SHIFT CONTROL VALVE AND SPRING
3 - 2-3 SHIFT VALVE AND SPRING
10 - PRESSURE PLUG COVER
4 - 2-3 THROTTLE PLUG
11 - LINE PRESSURE PLUG
5 - LIMIT VALVE HOUSING
12 - PLUG SLEEVE
6 - LIMIT VALVE COVER
13 - THROTTLE PRESSURE SPRING AND PLUG
7 - LIMIT VALVE AND SPRING
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AUTOMATIC TRANSMISSION - 42RE
AN
VALVE BODY (Continued)
Fig. 263 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 - 42RE
21 - 217
VALVE BODY (Continued)
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.
2
Allows either the manual valve to put line pressure on the 2-3 governor plug or
the KD Valve to put WOT line pressure on the 2-3 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.
ECE (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.
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AUTOMATIC TRANSMISSION - 42RE
AN
VALVE BODY (Continued)
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 pres-
sure 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 (Fig. 264) 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 clos-
ing of the dump will cause the oil pressure to
increase. Oil pressure on the opposite 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 run-
ning, fluid flows from the pump to the pressure reg-
ulator valve, manual valve, and the interconnected
circuits. As fluid is sent through passages to the reg-
ulator 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 selec-
tor in the PARK position, fluid recirculates through
the regulator and manual valves back to the sump.
Fig. 264 Regulator Valve in PARK Position
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AUTOMATIC TRANSMISSION - 42RE
21 - 219
VALVE BODY (Continued)
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