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BODY-VALVE
DESCRIPTION
The valve body consists of a cast aluminum valve body, a separator plate, and transfer plate. The valve body con-
tains valves and check balls that control fluid delivery to the torque converter clutch, bands, and frictional clutches.
The valve body contains the following components.
By adjusting the spring pressure acting on the regulator valve, transmission line pressure can be adjusted.
Regulator valve (2)
Switch valve (3)
Regulator valve spring (4)
Kickdown valve (5)
Kickdown detent (6)
Throttle valve and spring (7)
Manual valve (8)
1-2 Governor plug (9)
Throttlepressureplug(11)
2-3 Governor plug (12)
Shuttle valve primary spring (13)
Upper Housing Control Valve Locations
1 - UPPER HOUSING 8 - MANUAL VALVE
2 - REGULATOR VALVE 9 - 1-2 GOVERNOR PLUG
3 - SWITCH VALVE 10 - GOVERNOR PLUG COVER
4 - REGULATOR VALVE SPRING 11 - THROTTLE PLUG
5 - KICKDOWN VALVE 12 - 2-3 GOVERNOR PLUG
6 - KICKDOWN DETENT 13 - SHUTTLE VALVE PRIMARY SPRING
7 - THROTTLE VALVE AND SPRING
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Boost Valve (3)
Boost valve plug (4)
Shuttle valve (9)
Shuttle valve throttle plug (12)
Shuttle and Boost Valve Locations
1 - SPRING 8 - SHUTTLE VALVE COVER
2 - RETAINER 9 - SHUTTLE VALVE
3 - BOOST VALVE 10 - SHUTTLE VALVE PRIMARY SPRING
4 - BOOST VALVE PLUG 11 - GOVERNOR PLUG COVER
5 - SPRING GUIDES 12 - THROTTLE PLUG
6 - E-CLIP 13 - UPPER HOUSING
7 - SHUTTLE VALVE SECONDARY SPRING 14 - BOOST VALVE COVER
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1-2 shift valve (2)
1-2 control valve
2-3 shift valve
2-3 throttle plug
Throttlepressureplug
Limit valve and spring
Upper Housing Shift Valve and Pressure Plug Locations
1 - UPPER HOUSING 7 - LIMIT VALVE AND SPRING
2 - 1-2 SHIFT VALVE AND SPRING 8 - RETAINER
3 - 2-3 SHIFT VALVE AND SPRING 9 - 1-2 SHIFT CONTROL VALVE AND SPRING
4 - 2-3 THROTTLE PLUG 10 - PRESSURE PLUG COVER
5 - LIMIT VALVE HOUSING 11 - PLUG SLEEVE
6 - LIMIT VALVE COVER 12 - THROTTLE PRESSURE SPRING AND PLUG
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3-4 shift valve
3-4 timing valve
3-4 quick fill valve
3-4 accumulator
Converter clutch lock-up valve
Converter clutch lock-up timing Valve
OPERATION
NOTE: Refer to the Hydraulic Schematics for a visual aid in determining valve location, operation and
design.
CHECK BALLS
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 ANDSPRING
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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CHECK BALL NUMBER DESCRIPTION
1 Allows either the manual valve to put line pressure on the 1-2 governor plugor
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 thefront
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 AllowsthelockupclutchtousedatWOTin3rdgearbyputtinglinepressure
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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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 linesby 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 pressureto 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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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 andswitch 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, itmoves 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 pres-
sure.
Regulator Valve in Neutral Position
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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).
Regulator Valve in Drive Position
Regulator Valve in Reverse Position