1993 DODGE TRUCK Service Repair Manual

21 - 104
AUTOMATIC
TRANSMISSION—32RH/36RH/37RH/42RH/46RH

•
Condition

POMIOSO
Ccwse
Correction

NO
START
IN
PARK
OR

NEUTRAL
1.
Gearshift
linkage
out
of
adjustment

2.
Neutral
switch
wire
broken
or
open

3.
Faulty
neutral
switch

4.
Valve
body
manual
lever
assembly
bent,
worn,
broken,
or not
aligned
with
switch
1.
Adjust linkage

2.
Check continuity
with
test lamp; repair as required

3.
Refer to service section for test and replacement procedure

4.
inspect lever
assembly
and replace if damaged

SLUGGISH
ACCELERATION
AT
LOW
SPEEDS
OR
REQUIRES

EXCESSIVE
THROTTLE

OPENING
TO MAINTAIN
HIGHWAY
SPEEDS
1.
Poor
engine
performance
2.
Gearshift
or
throttle
linkage
out of adjustment
3.
Transmission
clutches slipping

4.
Overrunning clutch in converter not holding
5. Converter overrunning clutch stuck
1.
Check engine and repair as required
2. Adjust linkage
3. Perform stall test and repair as required

4.
Perform stall test and replace converter if clutch
has
failed
5. Replace converter

FLUID
CONTAMINATED

(DISCOLORED,
FULL
OF

SLUDGE
AND/OR
METAL

AND
FRICTION
MATERIAL
PARTICULAR)
1.
If contamination occurred shortly
after
overhaul,
fluid cooler and
lines
were
not
flushed
and flow rested. This is especially
true
when original overhaul

was
to correct a problem
that
generated a large
amount of debris,
such
as a gear
failure
or a clutch
pack
failure

Note: Flushing the cooler and lines is mandatory
after

a
failure
of the converter lockup clutch

2.
Incorrect fluid used in transmission
3. Main cooler in radiator is cracked, allowing engine coolant to
enter
transmission

4.
Severe overload results in overheat, fluid break­
down,
and accelerated wear, especially in high
ambient temperatures.
Most
frequent
causes
are:
• Vehicle is not properly equipped for heavy duty
service

• Tow vehicle and boat or
trailer
are both overloaded
•
Trailer
or boat are too large for tow vehicle (load exceeds rated capacity of tow vehicle)
1.
If contamination is severe, cooler flushing,
converter replacement, and another overhaul may be
necessary;
particularly so if shift

problems
were
also
present

2.
If
transmission
is operating properly, drain fluid, reverse flush cooler and lines, and change fluid

and
filter.
However, if shift problem has
developed, converter replacement and

transmission
overhaul may be required

3.
Replace radiator (and cooler) and flush lines. If problem was
diagnosed
early
enough,
fluid and

filter
change
may
only
be
necessary.
If
contamination perioa was prolonged, overhaul

and
converter replacement may be required

4.
Repair
transmission,
flush cooler, and lines.
Replace
converter if
necessary.
Install auxiliary
cooler if needed.
Also
install HD cooling system if needed. If tow vehicle and unit being towed
are both overloaded, the only repair is to reduce
the load to
rated
limits. However, if
trailer
or boat is too large for tow vehicle, the only option
is
for the owner to move up to properly-
equipped and load-rated tow vehicle

J9121-449

TRANSMISSION DIAGNOSIS

•

AUTOMATIC
TRANSMISSION—32RH/36RH/37RH/42RH/46RH
21-105 Condition

Possible
Co
use
Correction

NO
3-4 UPSHIFT
1.
Fourth
gear overdrive
switch
(on dash) in
OFF
1.
Turn control
switch
to ON position

2.
position

Overdrive
circuit
fuse
blown
2. Replace fuse; determine why fuse failed

and
repair as necessary
(i.e.,
shorts,

grounds
in
circuit)

3.
Fourth
gear
overdrive
switch
shorted, open,

wires
loose 3. Replace switch if shorted or open and
repair loose or damaged wires
4. Overdrive solenoid or circuit
wire
loose,
shorted, open 4. Check wires/connections
with
12V test lamp

and
voltmeter; repair damaged or loose
wires/connections as necessary
5. Solenoid
feed
orifice
in valve body is
blocked
5. Remove, disassemble, clean valve body
thoroughly
6.
Fourth
gear
overdrive
solenoid
failure
6. Verify solenoid
failure
with
test lamp and
replace solenoid
7.
Sensor
failure
(vehicle speed sensor or coolant

sensor)
7. Test both
sensors
with
test lamp or volt/
ohmmeter and replace
faulty
sensor
8. Park/neutral switch open or
shorted
or
switch

wire
to
powertrain
control
module is damaged
(loss
of park/neutral
input)
8. Test switch as described in service section

and
replace if necessary

9.
Powertrain
control module
faulty
9. Check
with
DRB II
scan
tool and replace if

necessary

10.
T.P.S.
fault
10. Adjust or replace
T.P.S.

11.
Transmission fluid
temperature
sensor
fault
(if equipped)
12. Overdrive piston seal
failure

13. Wrong
overdrive
piston
spacer
11.
Replace sensor
12. Replace both
seals

13. Remove unit, check end play, and install correct spacer
14.
Low
hydraulic pressure 14. Pressure test transmission to determine

cause

15. Set-reset module
faulty
15. Replace module (if equipped)

SUPS
IN
OVERDRIVE

FOURTH
GEAR
1.
2. Low
fluid
level

Overdrive piston or seal
malfunction
1.
Add fluid and check for leaks
2. Remove overdrive unit; replace piston
seals
if worn; replace piston if damaged, if piston

retainer
is damaged, it
will
be necessary to
remove and disassemble the transmission
3. Overdrive clutch pack
worn
3. Remove overdrive unit and rebuild clutch pack
4. 3-4
shift
valve,
timing
valve, or accumulator

malfunction
4. Remove and overhaul valve body. Replace
accumulator
seals.
Make sure all valves operate

freely
in bores, and do not bind or stick. Make
sure
valve body screws are correctly tightened

and
separator plates are properly positioned
5. Overdrive
piston
retainer
bleed
orifice
blown out 5. Disassemble transmission, remove
retainer,

and
replace orifice
6. Overdrive
unit
thrust
bearing
failure

6. Disassemble overdrive unit and replace
thrust bearing (No. 1 thrust bearing is between overdrive piston and clutch hub;

No.
2 thrust bearing is between the
planetary gear and the direct clutch spring plate; No. 3
thrust
bearing is between
overrunning clutch hub and output shaft)

J9321-252

42RH/46RH OVERDRIVE DIAGNOSIS

21-106
AUTOMATIC

TRANSMISSION—32RH/36RH/37RH/42RH/46RH

42RH/46RH OVERDRIVE DIAGNOSIS •
Condition

Possible
Cause
Correction

DELAYED
3-4
UPSHIFT

(SLOW
TO
ENGAGE)
1.
Low fluid
level

2. Overdrive solenoid or wiring is faulty

3.
Overdrive piston spacer too thin
4. Overdrive clutch pack worn
5.
T.P.S.
faulty
6. Overdrive clutch bleed orifice
plugged
1.
Add fluid and check for leaks
2. Test solenoid and check wiring for
loose/
corroded
connections,
or
shorts/ground;
replace

solenoid
if faulty and repiar wiring if
necessary

3.
Remove unit; measure end play and select proper spacer
4. Remove unit and rebuild clutch pack
5. Replace
T.P.S.
6.
Disassemble
transmission
and replace orifice
3-4
UPSHIFT
OCCURS
BEFORE

COMPLETION
OF 2-3
UPSHIFT
1.
Overdrive solenoid connector or wiring problem
2. Overdrive solenoid malfunction

3.
Coolant temperature or
T.P.S.
malfunction
4. Valve body malfunction
5. Powertrain control module malfunction
1.
Test connector and wiring for
loose
connections,

shorts,
or
ground,
and repair as needed
2. Replace solenoid

3.
Test each
sensor
for continuity, short,
ground,
and
replace as necessary
4. Remove,
disassemble,
clean, and inspect
valve
body components; make sure all valves

and
plugs
slide
freely
in bores; polish valves

with
crocus
cloth if needed
3. Test
with
DRB II
scan
tool and replace controller if faulty
J9321-253

+
AUTOMATIC
TRANSMISSION-32RH/36RH/37RH/42RH/46RH
21-107

42RH/46RH
OVERDRIVE
DIAGNOSIS

Condition
Possible
Cause
Correction

NO
4-3 DOWNSHIFT 1. Circuit wiring and/or connectors shorted
2. Converter clutch solenoid not venting
3. Overdrive solenoid not venting

4.
3-4 shift, shuttle, timing
valve,
or accumulator malfunction
5. Powertrain control module malfunction

6.
T.P.S.
malfunction
7.
Sensor
or sensor wiring problem 1. Test wiring and connectors,
with
test lamp

and
volt/ohmmeter; repair wiring as

necessary;
replace connectors and/or

harnesses
as required
2. Remove valve body and replace solenoid if seized or shorted
3. Remove valve body and replace solenoid if seized or shorted
4. Remove valve body; remove and disassemble lower housing and 3-4 accumulator
housing;

replace
seals
and clean valves as necessary;
be sure all valves slide
freely
in bores
5. Check operation
with
DRB II
scan
tool; replace controller only if faulty
6. Replace
T.P.S.

7. Check coolant and transmission
temperature
sensors,
speed sensor, and overdrive control
switch

NO
4-3 DOWNSHIFT WHEN

CONTROL
SWITCH
IS

TURNED
OFF 1. Control switch open-shorted
2. Overdrive solenoid wiring or connectors faulty
3. Overdrive or converter clutch solenoid not venting
4. Powertrain control module malfunction
1.
Test and replace switch if faulty
2. Check solenoid wiring and connections for
shorts/grounds;
repair as necessary
3. Test solenoids and replace if seized or shorted
4. Test
with
DRB II
scan
tool; replace module if faulty

J9321-254

21 - 108
AUTOMATIC
TRANSMISSION—32RH/36RH/37RH/42RH/46RH
•
42RH/46RH OVERDRIVE DIAGNOSIS

Condition
Possible
Cause
Correction

HARSH
1-2, 2-3, OR 3-2

SHIFTS
(A500)
1.
Lockup
solenoid
failure

1.
Remove
valve
body
and
replace
solenoid

TORQUE
CONVERTER
LOCKS
UP
IN
SECOND
AND/OR

THIRD
GEAR
(A500)
1.
Lockup
solenoid,
relay, or wiring problem

1.
Test
solenoid,
relay, and wiring for continuity,

shorts,
or
grounds;
replace
solenoid
and
relay
if

faulty;
repair
wiring and
connectors
as

necessary

NOISY
OPERATION
IN

FOURTH
GEAR
ONLY
1.
Overdrive
clutch
discs,
plates,
or
snap
rings

damaged

2. Overdrive
piston
or planetary thrust bearing brinnelled,
installed
wrong,
or
damaged

3.
Output shaft
bearings
brinnelled,
scored,
damaged
4. Planetary
gears
worn,
chipped,
damaged
5. Overdrive unit
overrunning
clutch rollers
rough,
scored,
or output
bushings
are worn
1.
Remove
unit
and
rebuild
clutch
pack
2.
Remove
and
disassemble
unit; replace
either
thrust bearing if
damaged

3.
Remove
and
disassemble
unit; replace
either
bearing
if
damaged

4.
Remove
and
overhaul overdrive unit
5.
Remove
and
overhaul overdrive unit
J9121 455

+
AUTOMATIC
TRANSMISSION—32RH/36RH/37RH/42RH/46RH
21 - 109

Condition

Possible Cause
Correction

NO
REVERSE
(OR
SLIPS
IN

REVERSE)
1.
Direct
clutch
spring
collapsed
or
broken

2.
Direct
clutch
pack
worn

3.
Rear
band
out of
adjustment

4.
Front
clutch
malfunction

5.
Overdrive
thrust
bearing
failure
1.
Remove
and disassemble
unit;
check
clutch
pack

and
replace
spring

2. Disassemble
unit
and
rebuild
clutch
pack

3.
Adjust
band

4. Air
pressure
test
clutch
operation;
remove
and
rebuild
if
necessary

5. Disassemble
geartrain
and
replace
bearings

NO
1-2
OR
2-3
UPSHIFT (HAS
LOW
AND REVERSE
ONLY)
1.
Governor
component
loose,
worn,
or
damaged

1.
Remove
and disassemble
unit;
replace
worn
or

damaged
governor
components
as
needed

J9121-456

42RH/46RH OVERDRIVE DIAGNOSIS

21 - 110
AUTOMATIC TRANSMISSION-32RH/36RH/37RH/42RH/46RH
•

POSSIBLE CAUSE
FAULTY OIL PUMP X X X X X
STICKING GOVERNOR VALVE X X X
PLUGGED COOLER, LINES OR FITTINGS X X
X
VALVE BODY MALFUNCTION X X X X X X X
STUCK SWITCH VALVE X X X X X X
STUCK CONVERTER CLUTCH VALVE X X X
STUCK CONVERTER CLUTCH SOLENOID X X
SOLENOID WIRING DISCONNECTED X
FAILED CONVERTER CLUTCH SOLENOID X
FAILED CONVERTER CLUTCH RELAY X X
FAULTY TORQUE CONVERTER: X X X X X
OUT OF BALANCE X
FAILED CONVERTER CLUTCH X X X
LEAKING TURBINE HUB SEAL X X
ALIGN EXHAUST SYSTEM X X
TUNE ENGINE X X X
FAULTY INPUT SHAFT OR SEAL RING X X
THROTTLE CABLE MISADJUSTED X X
Z
0

o
z
o
CONVERTER CLUTCH
WILL
NOT
ENGAGE

CLUTCH WILL
NOT

DISENGAGE

STAYS
ENGAGED
AT
TOO
LOW
A
SPEED
IN
4th
GEAR
LOCKS UP
OR
DRAGS
IN

LOW
OR
SECOND

STALLS
OR IS
SLUGGISH
IN
REVERSE

CHATTER
DURING
CLUTCH
ENGAGEMENT-(COLD)

VIBRATION
OR
SHUDDER
DURING
CLUTCH
ENGAGEMENT

VIBRATION
AFTER
CLUTCH
ENGAGEMENT

VIBRATION
WHEN
"REVVED"
IN
NEUTRAL

OVERHEATING:
OIL
COMING
j
OUT
OF
FILL
TUBE
OR
PUMP
SEAL

SHUDDER
AFTER
CLUTCH
ENGAGEMENT

TORQUE CONVERTER CLUTCH DIAGNOSIS