1993 DODGE TRUCK Service Repair Manual

21 - 96
AUTOMATIC
TRANSMISSION—32RH/36RH/37RH/42RH/46RH

• Condition

Possible
Cause
Correction

HARSH
ENGAGEMENT
(FROM
NEUTRAL
TO
DRIVE
OR

REVERSE)

Note: The shift from
neutral
to
reverse is normally
quite
firm. Hydraulic pressure at the
rear

servo can approach 300 psi in
reverse gear. Do not confuse a

firm
engagement
with
a
truly
harsh engagement
1.
Engine
idle
speed too high
2. Driver "riding" accelerator pedal during shift
3.
Throttle
cable or linkage misadjusted
4. Band adjustment needed

5.
Loose
mounting bolts
6 Worn or damaged
U-joints

7.
Loose
axle
pinion nut
8. Hydraulic pressure is incorrect
9. Accumulator piston spring, or seal worn or damaged
10. Faulty converter clutch (if equipped)

11.
Clutch, band, or
planetary
component
is
damaged 1. Check/adjust
idle
speed
2. Advise owner/operator
3. Adjust cable or linkage; setting is
either
too long or too short
4. Adjust
front/rear
bands
5. Check engine, transmission,
propeller
shaft, crossmember, and
axle
bolt torque;
tighten
loose
bolts and replace
missing
bolts
6. Remove
propeller
shaft and replace
U-joints

7. Replace nut and check pinion threads
before
installing new nut; replace pinion gear if
threads are damaged
8. Check pressures; remove, overhaul, or adjust valve body as needed;
repair
oil pump if

necessary

9. Remove valve body and replace piston,
seal,
or spring as needed
10. Replace converter and flush cooler and lines
before
installing new converter

11.
Remove, disassemble, and
repair
transmission
as necessary

DELAYED
ENGAGEMENT

(FROM
NEUTRAL
TO
DRIVE

OR
REVERSE)
1.
Engine
idle
speed too low
2. Low
fluid
level

3. Gearshift linkage but of adjustment
4. Rear band out of adjustment

5.
Valve body
filter
plugged
6. Oil pump gears worn or damaged or pump body or seal is damaged, allowing pump to

take
in air, causing
fluid
aeration

7. Reaction shaft seal rings worn or broken
8. Governor valve stuck or valve shaft is loose or damaged
9. Low hydraulic pressure
10. Clutch, band, or servo damage
1.
Adjust
idle
speed
2. Correct
level
and check for leaks
3. Adjust cable or linkage and
repair
linkage if worn or damaged
4. Adjust band
5. Replace
fluid
and
filter.
If oil pan and old
fluid
were
full
of clutch
disc
material
and/or
metal
particles, overhaul
will
be necessary
6. Remove transmission and replace oil pump
7. Remove transmission, remove oil pump, and replace seal rings
8. Remove and inspect governor components; replace worn or damaged parts
9. Perform pressure test, remove transmission, and
repair
as needed
10. Remove and disassemble transmission and
repair
as necessary

J9321-255

TRANSMISSION DIAGNOSIS

•

AUTOMATIC
TRANSMISSION—32RH/36RH/37RH/42RH/46RH
21 - 97
Cenoltfeie
Possible
Caws®
Cowscilon

SHIFTS
DELAYED
OR
ERRATIC
(SHIFTS
ALSO
HARSH
AT

TIMES)
1.
Low
fluid
level

2.
Throttle
linkage out
of
adjustment
3.
Throttle
linkage
is
binding

4.
Gearshift linkage out
of
adjustment
5. Fluid
filter
partially
clogged
6. Air in
fluid
due to
overfill
condition or
air
leakage
into
pump suction
passages

7.
Clutch
or
servo problem
8. Front band out of adjustment (may
cause
harsh
1-2
shift)
1.
Correct
fluid
level
and check
for
leaks
2. Adjust linkage
as
described in service section
3.
Disassemble,
clean, and adjust linkage; replace linkage grommets
if
removed
or if
worn or
cracked

4.
Adjust linkage
as
described in service section
5. Replace
filter. If filter
and
fluid
contained clutch
material
or
metal
particles, an overhaul may
be

necessary

6. Drain
fluid
to correct
level
if
overfilled.
If
fluid
is
highly
aerated
(full
of
bubbles
and foamy),
oil

pump
gasket
or seal may have failed,
or
pump

body
is
porous
or cracked

7.
Remove valve body and
air
test clutch, band and
servo
operation;
disassemble
and
repair

transmission
as needed
8. Adjust band

NO
REVERSE
(D
RANGES
OK)
1.
Gearshift linkage is
either
out of adjustment or

damaged

2. Rear band
is
out
of
adjustment
3. Valve body malfunction (stuck/damaged manual valve, regulator valve,
or
check ball)

4.
Rear servo or
front
clutch malfunction
1.
Repair or replace linkage parts as needed
2. Adjust band
3. Remove and service valve body; replace valve body
if
any valves or valve bores are worn
or

damaged

4.
Remove and
disassemble
transmission;
replace worn, damaged servo and clutch parts as
necessary

HAS
FIRST-REVERSE
ONLY

(NO
1-2
OR
2-3
UPSHIFT)
1.
Governor valve, shaft, weights, or body damaged

1.
Remove governor
assembly
and
repair
as

necessary

J9121-440

TRANSMISSION DIAGNOSIS

21
- 98
AUTOMATIC
TRANSMISSION-32RH/36RH/37RH/42RH/46RH

•
CendSfion

Possible
Cause Correction

NO
DRIVE
RANGE

(REVERSE
OK)
1.
Gearshift linkage
either
loose,
damaged or out of
adjustment
2. Low
fluid
level

3. Valve body malfunction (manual valve or shaft damaged or
1
-2 shift valve stuck)
4. Rear clutch
failure

5.
Transmission
overrunning clutch
failure

6. Input shaft seal
rings
worn or damaged
1.
Repair or replace linkage components
2. Correct
fluid
level
and check for leaks
3. Remove and
disassemble
valve body; replace as
assembly
if
any valves or bores are damaged

4.
Remove and
disassemble
transmission
and
rear
clutch;
repair/replace
worn, damaged parts as needed

5.
Remove and
disassemble
transmission;
replace overrunning clutch
6. Remove and
disassemble
transmission;
replace seal rings and any
other
worn or damaged parts

NO
DRIVE
OR
REVERSE

(VEHICLE
WILL NOT
MOVE)
1.
Low
fluid
level

2. Gearshift linkage
loose,
damaged, or misassembled
3.
Failure
of
driveline
component,
such
as
U-joint,
axle
shaft, transfer
case
component, etc.
4. Low
fluid
pressure due to worn or damaged
oil
pump
5.
Transmission
internal
component damaged
6. Valve body malfunction (seized valve, damaged manual
lever,
valve body screws
loose
or
overtightened
causing
distortion and bind)
1.
Add
fluid
and check for leaks
if
drive
is restored
2.
Inspect,
adjust, and reassemble linkage
as
needed; replace worn, damaged parts
3. Perform
preliminary
inspection procedure for vehicle
that
will
not
move;
refer
to procedure
in
diagnosis
section
4. Perform pressure test to confirm low pressure; replace pump body and/or
gears
if
necessary

5.
Remove and
disassemble
transmission;
repair
or replace
failed
components
as
needed

6.
Remove,
disassemble,
and inspect valve body; replace valve body (as
assembly)
if
any valve or
bore
is
damaged;
clean and reassemble
correctly
if all parts are in good condition

J9121-443

TRANSMISSION DIAGNOSIS

•

AUTOMATIC
TRANSMISSION-32RH/36RH/37RH/42RH/46RH
21 - 99 Condition

Possible
Cause
Correction

MOVES
IN 2ND OR 3RD

GEAR,
ABRUPTLY
DOWNSHIFTS
TO LOW
1.
Governor valve sticking
2. Valve body malfunction
1.
Remove, clean, and inspect; replace
faulty
parts
2. Remove, clean, and inspect; look for stuck
1
-2 valve or governor plug

SLIPS
IN LOW
GEAR
D
ONLY,

BUT
NOT IN 1
POSITION
1.
Overrunning clutch
faulty,
not holding

1.
Replace overrunning clutch

SLIPS
IN
FORWARD
DRIVE
RANGES
1.
Low
fluid
level

2. Air in
fluid
(fluid
is
foamy,
full
of bubbles), shifts are
spongy,
caused by air getting
into
pump suction

passages

3. Gearshift or
throttle
linkage out of adjustment
4. Low hydraulic
pressures
due to worn pump, incorrect control pressure adjustments, valve body
warpage or malfunction, sticking governor, leaking seal
rings,
dutch
seals
leaking, servo leaks, clogged

filter,
or cooler lines
5. Accumulator piston cracked, spring broken or seal worn
6. Clutch or servo malfunction, leaking
seals
or worn plates
7. Overrunning clutch worn, not holding (slips in
1
only)
1.
Add
fluid
and check for leaks
2. Check for bad pump gasket or
seals,
dirt
between
pump halves, and loose pump bolts or

defective
O-ring at
filler
tube

3. Adjust linkage
4. Perform hydraulic and air pressure
tests
to
determine
cause
5. Inspect and
repair
as
necessary
6. Air pressure check clutch-servo operation and
repair
as
required

7. Replace clutch

SLIPS
IN
REVERSE
ONLY
1.
Low
fluid
level

2. Aerated fluid; see
Slips
in Forward Drive
Ranges

3. Gearshift linkage out of adjustment
4. Rear band out of adjustment
5. Hydraulic pressure too low due to worn pump, worn seal
rings,
clutch or servo seal leakage
6. Worn
front
clutch, leaking
rear
servo, or worn
rear
band
7. Band-linkage binding
1.
Add
fluid
and check for leaks
2. See
Slips
in Forward Drive
Ranges

3. Adjust linkage
4. Adjust band
5. Perform hydraulic pressure tests to
determine
cause

6. Air pressure check clutch-servo operation and
repair
as
required

7. Inspect and
repair
as
required

J9121-444

TRANSMISSION DIAGNOSIS

21-100
AUTOMATIC
TRANSMISSION-32RH/36RH/37RH/42RH/46RH

• Condition

Possibie
Cause Correction

NO KICKDOWN
OR

NORMAL DOWNSHIFT
1.
Incorrect
throttle
linkage
or
cable adjustment

2.
Incorrect gear
shift
linkage
or
cable adjustment

3.
Front band
out of
adjustment

4
Hydraulic
pressures
too high
or
too low due
to
sticking governor, valve body malfunction,
or

incorrect
hydraulic
control
pressure adjustments

5.
Front
servo,
band,
or
linkage malfunction

6.
Clutch
or
servo malfunction
1.
Adjust linkage
or
cable

2.
Adjust linkage
or
cable

3.
Adjust band

4.
Perform hydraulic
pressure
tests
to
determine
cause
and repair
as
required. Correct valve
body
pressure
adjustments as required

5.
Air
pressure
test
operation and repair as
necessary

6.
Air
pressure
test
operation and repair as
necessary

STUCK
IN
LOW GEAR
(WILL
NOT UPSHIFT)
1.
Gearshift
or throttle
linkage
or
cable out
of

adjustment

2.
Front band
out of
adjustment

3.
Governor valve stuck
closed;
loose
output
shaft support
or
governor
housing
bolts, worn pump,
leaking seal rings,
or
valve body problem (i.e.,
stuck 1-2
shift
valve
or
governor plug)

4.
Clutch
or
servo malfunction
1.
Adjust linkage
or
cable. Repair linkage
of

worn
or
damaged.
Relace
damaged
cable.

2.
Adjust band

3.
Check
line
and governor
pressures
to
determine
cause;
correct
as required

4.
Air
pressure
check operation
of
clutches and
bands;
repair
faulty
component

NO LOW GEAR (MOVES
IN

2ND OR 3RD GEAR ONLY)
1.
Governor valve sticking
in
partially
open position

2.
Valve body malfunction

3.
Front servo piston cocked
in
bore

4.
Front band linkage malfunction

5.
Incorrect
throttle or
gearshift linkage
or
cable adjustment
1.
Remove
governor; clean, inspect, and repair

as
required

2.
Remove,
clean, and inspect. Look
for
sticking 1-2 vafve, 2-3 valve, governor plug,
or

broken springs

3.
Inspect servo and repair as required

4.
Inspect linkage and look
for
bind
in
linkage

5.
Adjust linkage
or
cable
J9321-256
TRANSMISSION DIAGNOSIS

+
AUTOMATIC TRANSMISSION—32RH/36RH/37RH/42RH/46RH 21 - 101

TRANSMISSION DIAGNOSIS
Condition
Possible
Cause Correction

CREEPS
IN
NEUTRAL
1. Gearshift linkage out of adjustment
2. Valve body malfunction (warped body,
cross
leakage)
3. Clutch dragging

4.
Converter lockup clutch dragging 1. Adjust linkage
2. Perform hydraulic pressure test to
determine
cause
ana
repair
as
required

3. Air pressure check operation of clutches and
repair
as
required

4. Oil pump worn; replace pump

DRAGS
OR
LOCKS
UP 1. Front or
rear
band out of adjustment
2. Servo band or linkage malfunction
(i.e.,
binding linkage, warped band, servo piston stuck)
3. Dragging clutch (does not release
fully)

4. Broken or seized planetary gears
5. Overrunning clutch worn, broken, or seized 1. Adjust bands
2. Air pressure check servo operation and
repair
as
required

3. Air pressure check clutch operation and
repair
as
required

4. Remove, inspect, and
repair
as
required
(look for debris in oil pan)
5. Remove and inspect clutch,
repair
as
required

GROWLING,
GRATING,
OR
SCRAPING
NOISES
1. Planetary gear set broken or seized
2. Overrunning clutch worn, seized, or broken
3. Oil pump components scored, binding, or broken
4. Output shaft bearing or bushing damaged
5. Faulty clutch operation
6. Governor support (park gear) binding or seal rings broken
7. Front and
rear
bands out of adjustment 1. Check for debris in oil pan and
repair
as

required

2. Inspect and check for debris in oil pan;
repair
as
required

3. Remove, inspect, and
repair
as
required

4. Remove, inspect, and
repair
as
required
5. Perform air pressure check and
repair
as
required

6. Remove, inspect, and
repair
as
required

7. Adjust bands

BUZZING
NOISE
1.
Low
fluid
level

2. Air being drawn into pump suction
passages

3. Overrunning clutch damaged

4.
Valve body
misassembled,
bolts loose, weak spring, or mispositioned valve or check
ball
1. Add
fluid
and check for leaks
2. Check pump for porous casting, scores on mating surfaces, and excess rotor clearance;

repair
as
required

3. Replace clutch
4. Remove,
disassemble,
inspect valve body; reassemble correctly if
necessary;
replace

assembly
if valves or
springs
are damaged

J9121-446

21-102
AUTOMATIC

TRANSMISSION—32RH/36RH/37RH/42RH/46RH

TRANSMISSION
DIAGNOSIS
•
Condition

Possible
Cause Correction

OIL
COMES
OUT
FILLER
TUBE
1.
Transmission
overfilled
1.
Drain
fluid
to
correct
level;
remove
neutral

switch
and drain
through
switch
hole
with

suction
gun

2.
Breather
vent
in
oil
pump
blocked
2.
Inspect
and
clear
blockage

3,
Fly id
cooler
or cooler
lines
plugged
3.
Flush
cooler and lines
4. Air in
fluid
(aerated)
4.
See
"Slips
In
Forward
Drive
Ranges"

5.
Oil
filter
clogged
5.
Replace
filter;
determine
the reason for clogged
condition and
repair

6.
tear
servo
piston
or
seal
failure
6.
Check hydraulic pressure at servo
in
reverse

(will
register
low or
fluctuate
rapidly)

7.
Valve body
switch
valve
sticking
7.
Remove
and
clean
valve

OIL
LEAKS
(ITEMS
LISTED
REPRESENT
POSSIBLE
LEAK

POINTS
AND
SHOULD
ALL
BE

CHECKED)
1.
Speedometer
adapter

2.
Pan
gasket

3.
Filler
tube
(where
tube
enters
case)

4.
Fluid
lines
and
fittings

5.
Valve body
manual
lever
shaft
seal

6.
Pressure
port
plug
loose 7. Rear
bearing
access
plate

8. Gasket damaged or
bolts
are loose

9.
Adapter/extension
gasket damaged

10.
Neutral
switch

11.
Converter
housing area
12. Cooler
line
fittings and hoses
13. Pump seal
14. Torque converter
1.
Replace both adapter seals
2. Tighten pan screws to 150 inch-pounds; if
leaks
persist,
replace
gasket;
do not

overtighten screws

3. Replace O-ring seal
4. Tighten fittings; if leaks persist, replace fittings and lines if necessary
5. Replace shaft seal
6. Tighten to correct torque; replace plug if leak
persists

7. Replace gasket
8. Replace bolts or gasket or tighten bolts
9. Replace gasket
10. Replace switch and gasket
11. Check for leaks at seal caused by worn seal or burr on converter hub (cutting seal), worn

bushing,
missing
oil
return,
oil in
front
pump

housing,
or hole plugged. Check for leaks past
O-ring seal on pump, or past pump-to-case
bolts;
pump housing porous, oil coming out
vent due to
overfill
or leak past
front
band shaft

access
plug
12. Replace fittings and hoses
13. Replace seal 14. Replace converter

J9121-448

•

AUTOMATIC
TRANSMISSION—32RH/36RH/37RH/42RH/46RH
21-103

TRANSMISSION DIAGNOSIS

Condition
Possible
Couso
Correction

OVERHEAT
DURING

COMMERCIAL
OPERATION

OR
WHILE
TRAILER
TOWING
(FLUID
DARK
AND
BURNED

WITH
SOME
SLUDGE
FORMATION)
1.
Vehicle not properly equipped for
trailer
towing or
commercial use
2. Vehicle not equipped
with
auxiliary fluid cooler

3.
Extensive idling
time
or operation in heavy
traffic
in hot weather
4. Tow vehicle overloaded (exceeding vehicle tow capacity)
5. Air flow to auxiliary cooler blocked by snow plow,
front
mounted spare
tire,
bug screen, or similar
item
1.
Be sure vehicle is equipped
with
recommended
optional components
(i.e.,
HD
springs,

transmission,
axle, larger CID engine, auxiliary cooler, correct axle ratio, etc.). If vehicle is not so
equipped, it should not be used for severe
service operation
2. Drain fluid, change
filter,
and install auxiliary cooler

3.
Cut down on idling time; shift into
neutral
every
so
often and run engine at 1000 rpm to help
circulate fluid through cooler
4. Be sure vehicle is properly equipped to handle
load;
do not tow
Class
Ill-type loads
with
a
vehicle
that
is only
rated
for
Class
1
or II operation

5.
Remove or reposition
item
causing
air flow
blockage

OVERHEAT
DURING
NORMAL
OPERATION
(FLUID
DISCOLORED,
SMELLS
BURNED)
1.
Low
fluid
level

2. Fluid cooler, lines blocked, or cooler cracked (oil in engine coolant)

3.
Switch valve sticking
4. Clutch pack clearance incorrect (too tight)
5.
Bands
too tight 1. Add
fluid
and check for leaks
2. Flush cooler and lines and replace radiator if
transmission
fluid has
entered
coolant

3.
Remove,
disassemble,
clean valve body
4. Check and correct as required
5. Adjust bands

J9121-450