4. Remove timing valve cover.
5. Remove 3-4 timing valve and spring.
6. Remove 3-4 quick fill valve, spring and plug.
7. Remove 3-4 shift valve and spring.
8. Remove converter clutch valve, spring and plug.
9. Remove converter clutch timing valve, retainer and
valve spring.
CLEANING
Clean the valve housings, valves, plugs, springs, and separator plates with a standard parts cleaning solution only.
Do not use gasoline, kerosene, or any type of caustic solution.
Do not immerse any of the electrical components in cleaning solution. Clean the governor solenoid and sensor and
the dual solenoid and harness assembly by wiping them off with dry shop towels only.
Dry all except the electrical parts with compressed air. Make sure all passages are clean and free from obstructions.
Do not use rags or shop towels to dry or wipe off valve body components. Lint from these materials can
stick to valve body parts, interfere with valve operation, and clog filters and fluid passages.
Wipe the governor pressure sensor and solenoid valve with dry, lint free shop towels only. The O-rings on the sen-
sor and solenoid valve are the only serviceable components. Be sure the vent ports in the solenoid valve are open
and not blocked by dirt or debris. Replace the valve and/or sensor only whenDRB scan tool diagnosis indicates this
is necessary. Or, if either part has sustained physical damage (dented, deformed, broken, etc.).
CAUTION: Do not turn the small screw at the end of the solenoid valve for any reason. Turning the screw
in either direction will ruin solenoid calibration and result in solenoidfailure. In addition, the filter on the
solenoid valve is NOT serviceable. Do not try to remove the filter as this will damage the valve housing.
INSPECTION
Inspect the throttle and manual valve levers and shafts. Do not attempt to straighten a bent shaft or correct a loose
lever. Replace these components if worn, bent, loose or damaged in any way.
Inspect all of the valve body mating surfaces for scratches, nicks, burrs,or distortion. Use a straightedge to check
surface flatness. Minor scratches may be removed with crocus cloth using only very light pressure.
Minor distortion of a valve body mating surface may be corrected by smoothing the surface with a sheet of crocus
cloth. Position the crocus cloth on a surface plate, sheet of plate glass orequally flat surface. If distortion is severe
or any surfaces are heavily scored, the valve body will have to be replaced.
CAUTION: Many of the valves and plugs, such as the throttle valve, shuttle valve plug, 1-2 shift valve and
1-2 governor plug, are made of coated aluminum. Aluminum components are identified by the dark color of
thespecialcoatingappliedtothesurface(orbytestingwithamagnet).Donot sand aluminum valves or
plugs under any circumstances. This practice could damage the special coating causing the valves/plugs to
stick and bind.
Inspect the valves and plugs for scratches, burrs, nicks, or scores. Minorsurface scratches on steel valves and
plugs can be removed with crocus cloth butdo not round off the edges of the valve or plug lands.Maintaining
sharpness of these edges is vitally important. The edges prevent foreign matter from lodging between the valves
and plugs and the bore.
Inspect all the valve and plug bores in the valve body. Use a penlight to viewthe bore interiors. Replace the valve
body if any bores are distorted or scored. Inspect all of the valve body springs. The springs must be free of dis-
tortion, warpage or broken coils.
Check the two separator plates for distortion or damage of any kind. Inspect the upper housing, lower housing, 3-4
accumulator housing, and transfer plate carefully. Be sure all fluid passages are clean and clear. Check condition of
the upper housing and transfer plate check balls as well. The check balls and ball seats must not be worn or dam-
aged.
Trial fit each valve and plug in its bore to check freedom of operation. Whenclean and dry, the valves and plugs
shoulddropfreelyintothebores.
Valve body bores do not change dimensionally with use. If the valve body functioned correctly when new, it will
continue to operate properly after cleaning and inspection. It should notbe necessary to replace a valve body
assembly unless it is damaged in handling.
The only serviceable valve body components are listed below. The remaining valve body components are serviced
only as part of a complete valve body assembly. Serviceable parts are:
dual solenoid and harness assembly
solenoid gasket
solenoid case connector O-rings and shoulder bolt
switch valve and spring
pressure adjusting screw and bracket assembly
throttle lever
manual lever and shaft seal
throttle lever shaft seal, washer, and E-clip
fluid filter and screws
detent ball and spring
valve body screws
governor pressure solenoid
governor pressure sensor and retaining clip
park lock rod and E-clip
ASSEMBLY
CAUTION: Do not force valves or plugs into place during reassembly. If the valve body bores, valves and
plugs are free of distortion or burrs, the valve body components should allslide into place easily. In addi-
tion, do not overtighten the transfer plate and valve body screws during reassembly. Overtightening can
distort the housings resulting in valve sticking, cross leakage and unsatisfactory operation. Tighten valve
body screws to recommended torque only.
INSTALLATION
1. Check condition of O-ring seals (1) on valve body
harness connector (2). Replace seals on connector
body if cut or worn.
2. Check condition of manual lever shaft seal (2) in
transmission case. Replace seal if lip is cut or
worn. Install new seal with 15/16 deep well socket
(1).
3. Check condition of seals on accumulator piston. Install new piston seals, if necessary.
4. Place valve body manual lever in low (1 position) so ball on park lock rod will be easier to install in sprag.
5. Lubricate shaft of manual lever with petroleum jelly. This will ease inserting shaft through seal in case.
6. Lubricate seal rings on valve body harness connector with petroleum jelly.
7. Position valve body in case and work end of park lock rod into and through pawl sprag. Turn propeller shaft to
align sprag and park lock teeth if necessary. The rod will click as it enterspawl. Move rod to check engagement.
CAUTION: It is possible for the park rod to displace into a cavity just abovethe pawl sprag during instal-
lation. Make sure the rod is actually engaged in the pawl and has not displaced into this cavity.
8. Install accumulator spring and piston into case. Then swing valve body overpistonandouterspringtoholditin
place.
9. Align accumulator piston and outer spring, manual lever shaft and electrical connector in case.
10. Then seat valve body in case and install one or two bolts to hold valve bodyinplace.
11. Tighten valve body bolts alternately and evenly to 11 Nꞏm (100 in. lbs.)torque.
12. Install new fluid filter on valve body. Tighten filter screws to 4 Nꞏm (35 in. lbs.) torque.
13. Install throttle and gearshift levers on valve body manual lever shaft.
14. Check and adjust front and rear bands if necessary.
15. Install the transmission range sensor (Refer to 21 - TRANSMISSION/AUTOMATIC/TRANSMISSION RANGE
SENSOR - INSTALLATION).
16. Connect solenoid case connector wires.
17. Install oil pan and new gasket. Tighten pan bolts to 13.6 Nꞏm (125 in. lbs.) torque.
18. Lower vehicle and fill transmission with Mopar
ATF +4, Automatic Transmission fluid.
19. Check and adjust gearshift and throttle valve cables, if necessary.
ADJUSTMENTS - VALVE BODY
CONTROL PRESSURE ADJUSTMENTS
There are two control pressure adjustments on the valve body;
Line Pressure
Throttle Pressure
Line and throttle pressures are interdependent because each affects shift quality and timing. As a result, both
adjustments must be performed properly and in the correct sequence. Adjust line pressure first and throttle pressure
last.
LINE PRESSURE ADJUSTMENT
1. Measure distance (2) from the valve body to the
inner edge of the adjusting screw with an accurate
steel scale. Distance should be 33.4 mm (1-5/16
in.). If adjustment is required, turn the adjusting
screw in, or out, to obtain required distance setting.
NOTE: The 33.4 mm (1-5/16 in.) setting is an
approximate setting. Manufacturing tolerances
may make it necessary to vary from this dimen-
sion to obtain desired pressure.
One complete turn of the adjusting screw changes line
pressure approximately 1-2/3 psi (9 kPa).
Turning the adjustingscrew counterclockwise
increases pressure while turning the screw clockwise
decreases pressure.
THROTTLE PRESSURE ADJUSTMENT
1. Insert Gauge Tool C-3763 between the throttle
lever cam and the kickdown valve stem (2).
2. Push the gauge tool inward to compress the kick-
down valve against the spring and bottom the throt-
tle valve.
3. Maintain pressure against kickdown valve spring.
Turn throttle lever stop screw until the screw head
touches throttle lever tang and the throttle lever
cam touches gauge tool.
NOTE: The kickdown valve spring must be fully
compressed and the kickdown valve completely
bottomed to obtain correct adjustment.
When Monitored:
With the ignition on.
Set Condition:
Transfer Case Range Select Switch voltage less than 0.1568 volts for 5 seconds
Possible Causes
(K77) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT OPEN
(K77) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT SHORTED TO GROUND
(K977) MODE SELECT CIRCUIT OPEN
(K977) MODE SELECT CIRCUIT SHORT TO GROUND
TRANSFER CASE SELECTOR SWITCH
INSTRUMENT CLUSTER
Diagnostic Test
1.TRANSFER CASE SWITCH VOLTAGE LESS THAN 0.2 VOLTS
Ignition on, engine not running.
With the scan tool under Instrument Cluster, read the Transfer Case Switchvoltage.
Is the voltage less than 0.2 volts?
Ye s>>
Go To 2
No>>
Go To 8
2.(K77) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT VOLTAGE LESS THAN 0.2 VOLTS
Turn the ignition off to the lock position.
Disconnect the Transfer Case Selector Switch harness connector.
Ignition on, engine not running.
Measure the voltage of the (K77) 5 Volt Selector Switch Supply circuit.
Is the voltage less than 0.2 volts?
Ye s>>
Go To 3
No>>
Go To 5
3.(K77) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT OPEN
Turn the ignition off to the lock position.
Disconnect the Instrument Cluster C4 connector.
Measure the resistance of the (K77) 5 Volt Selector Switch Supply cir-
cuit between the Instrument Cluster C4 harness connector and the
Transfer Case Selector Switch harness connector.
Is the resistance greater than 5.0 ohms?
Ye s>>
Repair the (K77) 5 Volt Selector Switch Supply circuit for an
open.
Perform the TRANSFER CASE VERIFICATION TEST-VER
1. (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER
CASE - STANDARD PROCEDURE)
No>>
Go To 4
4.(K77) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K77) 5 Volt Selector
Switch Supply circuit.
Is the resistance less than 5.0 ohms?
Ye s>> Perform the TRANSFER CASE VERIFICATION TEST-
VER 1. (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER
CASE - STANDARD PROCEDURE)
No>>
Replace the Instrument Cluster in accordance with the Ser-
vice Information.
Perform the BODY VERIFICATION TEST-VER 1 (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE) and TRANSFER CASE VERI-
FICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/
TRANSAXLE/TRANSFER CASE - STANDARD
PROCEDURE).
5.TRANSFER CASE SELECTOR SWITCH
Turn the ignition off to the lock position.
Connect a jumper wire between the (K77) 5 Volt Selector Switch Supply
circuit and the (K977) Mode Select circuit in the Transfer Case Selector
Switch harness connector.
Ignition on, engine not running.
With the scan tool in Data Display, read the Range Switch voltage.
NOTE: The switch voltage should be approximately 5.0 volts ( ± .05
volts).
Does the voltage display as described?
Ye s>>
Replace the Transfer Case Selector Switch in accordance
with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER
1. (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER
CASE - STANDARD PROCEDURE)
No>>
Go To 6
6.(K977) MODE SELECT CIRCUIT SHORT TO GROUND
Disconnect the Instrument Cluster C3 connector.
Measure the resistance between ground and the (K977) Mode Select
circuit.
Is the resistance less than 5.0 ohms?
Ye s>>
Repair the (K977) Mode Select circuit for a short to ground.
Perform the TRANSFER CASE VERIFICATION TEST-VER
1. (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER
CASE - STANDARD PROCEDURE)
No>>
Go To 7
When Monitored:
With the ignition on.
Set Condition:
Transfer Case Range Select Switch voltage greater than 4.86 volts for 5 seconds
Possible Causes
(K77) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT SHORTED TO VOLTAGE
(K977) MODE SELECT CIRCUIT SHORTED TO VOLTAGE
(K977) MODE SELECT CIRCUIT OPEN
(Z905) TRANSFER CASE SELECTOR SWITCH GROUND CIRCUIT OPEN
TRANSFER CASE SELECTOR SWITCH
INSTRUMENT CLUSTER
Diagnostic Test
1.TCASE SWITCH VOLTAGE ABOVE 4.8 VOLTS
Ignition on, engine not running.
With the scan tool under Instrument Cluster, read the Transfer Case Switchvoltage.
Is the volage above 4.8 volts?
Ye s>>
Go To 2
No>>
Go to 8
2.(K77) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off to the lock position.
Disconnect the Transfer Case Selector Switch harness connector.
Disconnect the Instrument Cluster C4 harness connector.
Ignition on, engine not running.
Measure the voltage of the (K77) 5 Volt Selector Switch Supply circuit.
Is there any voltage present?
Ye s>>
Repair the (K77) 5 Volt Selector Switch Supply circuit for a
short to voltage.
Perform the TRANSFER CASE VERIFICATION TEST-VER
1. (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER
CASE - STANDARD PROCEDURE)
No>>
Go to 3