1969 FORD MUSTANG automatic transmission fluid

07-01-03

General Transmission Service

07-01-03

COMPONENT INDEX

FMX Transmission

REAR SUPPORT (FMX)

Inspection

SHIFT POINT CHECKS

STATOR ONE-WAY CLUTCH CHECK

STATOR TO IMPELLOR INTERFERENCE

CHECK

STATOR TO TURBINE INTERFERENCE

CHECK

TRANSMISSION CLEANING

TURBINE AND STATOR END PLAY

CHECK

VACUUM DIAPHRAGM ADJUSTMENT

Altitude Compensating Type

Non-Altitude Compensating Type

VACUUM UNIT CHECK

Altitude Compensating Type

Non-Altitude Compensating Type
MODEL APPLICATION
All
Models

01-06

01-12

01-12

01-12

01-11

01-12
Ford
01-17

01-16

N/A

01-08

N/A

01-05
Mercury
N/A

N/A

N/A

01-08

N/A

01-05
Meteor
01-17

01-16

N/A

01-08

N/A

01-05
Cougar
01-17

01-16

N/A

01-08

N/A

01-05
Fairlane
01-17

01-16

N/A

01-08

N/A

01-05
Falcon
N/A

N/A

N/A

01-08

N/A

01-05
Montego
01-17

01-16

N/A

01-08

N/A

01-05
Mustang
01-17

01-16

N/A

01-08

N/A

01-05
Lincoln-
Continental
N/A

N/A

01-09

N/A

01-06

N/A
Thunderbird
N/A

N/A

01-09

N/A

01-06

N/A
Continental-
Mark
III
N/A

N/A

01-09

N/A

01-06

N/A

A page number indicates that the item is for the vehicle listed at the head of the column.

N/A indicates that the item is not applicable to the vehicle listed.

Three different three-speed trans-

missions are used. The C4 Automatic,

C6 Automatic and the FMX Auto-

matic. Part 7-1 covers testing, com-
mon adjustments and repairs, and

cleaning and inspection for the three

types of transmissions. Where there
are differences in procedures or speci-

fications, the type of transmission af-

fected will be designated.

l
AUTOMATIC TRANSMISSION TESTS

When diagnosing transmission

problems, refer to the Ford Car and

Truck Diagnosis Manual for the de-

tailed information on the items that

could be causing the problem.

The following preliminary checks

should be made before proceeding

with other diagnosis checks.

TRANSMISSION FLUID LEVEL

CHECK

1.
Make sure that the vehicle is

standing level. Then firmly apply the

parking brake.

2.
Run the engine at normal idle

speed. If the transmission fluid is cold

run the engine at fast idle speed

(about 1200 rpm) until the fluid reach-

es its normal operating temperature.

When the fluid is warm, slow the en-

gine down to normal idle speed.

3.
On a vehicle equipped with a

vacuum brake release, disconnect the

release line and plug the end of the
line;
otherwise the parking brake will

not hold the transmission in any drive

position.

4.
Shift the selector lever through

all positions, and place the lever at P.

Do not turn off the engine during the

fluid level checks.

5.
Clean all dirt from the transmis-

sion fluid dipstick cap before remov-

ing the dipstick from the filler tube.

6. Pull the dipstick out of the tube,

wipe it clean, and push it all the way

back into the tube. Be sure it is prop-

erly seated.

7.
Pull the dipstick out of the tube

again, and check the fluid level. The

fluid level should be above the ADD

mark. If necessary, add enough fluid

to the transmission through the filler

tube to bring the level between the

ADD and FULL marks on the dip-

stick. Do not overfill the transmission.

Install the dipstick, making sure it is

fully seated in the tube.
8. Connect the vacuum brake re-

lease line if so equipped, and test it

for proper operation.

FLUID AERATION CHECK

A fluid level that is too high will

cause the fluid to become aerated:

Aerated fluid will cause low control

pressure, and the aerated fluid may be

forced out the vent.

Check the transmission fluid level.

Low fluid level can affect the opera-

tion of the transmission, and may in-

dicate fluid leaks that could cause

transmission damage.

TRANSMISSION FLUID

LEAKAGE CHECKS

Check the speedometer cable con-

nection at the transmission. Replace

the rubber seal if necessary.

Leakage at the oil pan gasket often

can be stopped by tightening the at-
procarmanuals.com

07-01-07

General Transmission Service

07-01-07

PUMP IN

INTERMEDIATE

SERVO RELEASE
REVERSE AND

HIGH CLUTCH

INTERMEDIATE

SERVO APPLY

GOVERNOR PRESSURE

TO VALVE BODY
FORWARD

CLUTCH

PUMP OUT

CONVERTER IN

CONTROL

PRESSURE

TO PRIMARY

THROTTLE VALVE

PRIMARY THROTTLE

PRESSURE-TO-VALVE

BODY

PRIMARY THROTTLE

VALVE EXHAUST
LOW AND

REVERSE SERVO

CONTROL PRESSURE

TO GOVERNOR

D1841-A

FIG. 70—Case Fluid Passage Hole Identification—C4 Automatic
FRONT PUMP FRONT GOVERNOR

DISCHARGE CLUTCH OUTPUT

FRONT FROM

PUMP CONVERTER REAR

INTAKE SERVO
REAR

CLUTCH

D1932-A

FIG. 12—Case Fluid Hole

Identification—FMX Transmission

in the vehicle, check the hydraulic sys-

tem to make sure it is operating prop-

erly. These hydraulic tests can be

made on the bench so that most mal-

functions of the system can be cor-

rected before the transmission is in-

stalled in the vehicle.

TESTING TOOL

INSTALLATION

SERVO RELEASE

SERVO APPLY
PUMP SUCTION REVERSE-HIGH FORWARD CLUTCH

APPLY APPLY
CONVERTER CHARGE

PUMP PRESSURE

TV PRESSURE

LINE PRESSURE

TV PRESSURE

EXHAUST

-S>*REVERSE CLUTCH

GOVERNOR PRESSURE CONTROL PRESSURE

OUT PUT GOVERNOR
APPLY
1.
Install a plug in the filler tube

hole in the case or pan, and pour

about four quarts of clean transmis-

sion fluid into the transmission

through the speedometer gear open-

ing.

2.
Remove the vacuum diaphragm

unit and the diaphragm unit control

rod, and reinstall the vacuum unit if

these parts had been previously in-

stalled.

Tool-7003

D1587-B
D1933-A

FIG.
7
7—Case
Fluid Passage Hole Identification—C6 Automatic
FIG. 73—Bench Testing Tool

Installation—Typicalprocarmanuals.com

07-01-08
General Transmission Service

07-01-08

3.
Install the bench testing tool on

the transmission.

4.
Remove the
1/8-inch
pipe plug

at the transmission case. Turn the

front pump in a clockwise direction at

75-100 rpm until a regular flow of

transmission fluid leaves the hole in

the transmission case. This operation
bleeds the air from the pump.

5.
Install the pressure gauge (77820

or T57L-77820-A) as shown in Fig.

13.

PRESSURE TESTS

Turn the front pump at 75-100 rpm
and note the gauge readings. The

pressure readings on the bench test

must be within the limits as outlined

in Figure 13, for the engine idle check.

If pressure gauge readings are with-

in limits in all selector lever positions,

install the vacuum diaphragm control

rod unit.

COMMON ADJUSTMENTS AND REPAIRS

TRANSMISSION FLUID DRAIN

AND REFILL

Normal maintenance and lubrica-

tion requirements do not necessitate

periodic automatic transmission fluid

changes.

If a major repair, such as a clutch

band, bearing, etc., is required in the

transmission, it will have to be re-

moved for service. At this time the

converter, transmission cooler and

cooler lines must be thoroughly

flushed to remove any dirt.

When filling a dry transmission and

converter, install five quarts of fluid.

Start the engine, shift the selector

lever as outlined below, and check and

add fluid as necessary.

Following are the procedures for

partial drain and refill due to in-

vehicle repair operation.

C4 TRANSMISSION

1.
On PEA models, disconnect the

fluid filler tube from the transmission

oil pan to drain the fluid.

On PEB and PEE models, loosen

the pan attaching bolts to drain the

fluid from the transmission.

2.
When the fluid has stopped

draining from the transmission, re-

move and thoroughly clean the pan

and the screen. Discard the pan gas-

ket.

3.
Place a new gasket on the pan,

and install the pan on the transmis-

sion.

4.
On PEA models, connect the

filler tube to the pan and tighten the

fitting securely.

5.
Add three quarts of fluid to the

transmission through the filler tube.

6. Run the engine at idle speed for

about two minutes, and then run it at

fast idle speed (about 1200 rpm) until

it reaches it's normal operating temp-

erature. Do not race the engine.

7.
Shift the selector lever through

all the positions, place it at P, and

check the fluid level. The fluid level

should be above the ADD mark. If
necessary, add enough fluid io the

transmission to bring the level be-

tween the ADD and FULL marks on

che dipstick. Do not overfill the trans-

mission.

FMX OK C6

TRANSMISSION

1.
Raise the vehicle on a hoist or

jack stands.

2.
Place a drain pan under the

transmission.

3.
Loosen the pan attaching bolts

to drain the fluid from the transmis-

sion.

4.
After the fluid has drained to the

level of the pan flange, remove the

rest of the pan bolts working from the

rear and both sides of the pan to

allow it to drop and drain slowly.

5.
When the fluid has stopped

draining from the transmission, re-

move and thoroughly clean the pan

and the screen. Discard the pan gas-

ket.

6. Place a new gasket on the pan,

and install the pan on the transmis-

sion.

7.
Add three quarts of fluid to the

transmission through the filler tube.

8. Run the engine at idle speed for

about two minutes, and then run it at

fast idle speed (about 1200 rpm) until

it reaches normal operating tempera-

ture.
Do not race the engine.

9. Shift the selector lever through

all the positions, place it at P, and

check the fluid level. The fluid level

should be above the ADD mark. If

necessary, add enough fluid to the

transmission to bring the level be-

tween the ADD and FULL marks on

the dipstick. Do not overfill the trans-

mission.

OIL COOLER TUBE

REMOVAL AND INSTALLATION

When fluid leakage is found at the

oil cooler, the cooler must be re-

placed. Cooler replacement is de-

scribed in the Cooling System Section

of Group 11.
When one or more of the fluid

cooler steel tubes must be replaced,

each replacement tube must be fabri-

cated from the same size steel tubing

as the original line.

Using the old tube as a guide, bend

the new tube as required. Add the

necessary fittings, and install the tube.

After the fittings have been tight-

ened, add fluid as needed, and check

for fluid leaks.

VACUUM DIAPHRAGM

ADJUSTMENT NON-ALTITUDE

COMPENSATING TYPE

The C4 and C6 transmissions are

equipped with an adjustable vacuum

diaphragm assembly. A similar ad-

justable diaphragm has been released

for service with the FMX transmis-

sion. However, the FMX service dia-

phragm is not interchangeable with

that used on C4 and C6 models.

The vacuum diaphragm assembly

has an adjusting screw in the vacuum

hose connecting tube (Fig. 14).

SPRING

SEAT

THIS CLEARANCE CHANGED

BY ADJUSTING SCREW

D1830-A

FIG. 14—Adjustable Vacuum Unit

The inner end of the screw bears

against a plate which in turn bears

against the vacuum diaphragm spring.

All readings slightly high or all

readings slightly low may indicate the

vacuum unit needs adjustment to cor-

rect a particular shift condition.procarmanuals.com

07-01-11
General Transmission Service

07-01-11

STOP
PIN

GROMMET

Tool - T67P-734LA

GROMMET

LEVER

CONTROL ROD REMOVAL
GROMMET INSTALLATION

Tool - T67P-734LA

r

CONTROL ROD INSTALLATION
3/16"-1/4'

CONTROL ROD

STOP
PIN

FIG. 18—Removing
or
Installing Shift Linkage Grommet
D 1742-A

MANUAL SHIFT LINKAGE

GROMMET REPLACEMENT-

COLUMN SHIFT

The manual lever assembly
on ve-

hicles equipped with
a
column shift
in-

corporates
an oil
impregnated plastic

grommet
in the end of the
lever
arm.

A special tool T67P-7341-A
is re-

quired
to
install
the
grommet
in the

manual lever,
and to
install
the
manu-

al linkage
rod
into
the
grommet.
Re-

move
and
install
the
grommet
as fol-

lows:

1.
Place
the
lower
jaw of the
tool

between
the
manual lever
and the con-

trol
rod.
Position
the
stop
pin
against
the
end of the
control
rod (Fig. 18)

and force
the rod out of the
grommet.

Remove
the
grommet from
the
manu-

al lever
by
cutting
off the
large shoul-

der with
a
sharp knife.
The
grommet

must
be
removed from
the
manual

lever
and a new one
installed each

time
the rod is
disconnected.

2.
Before installing
a
new grommet,

adjust
the
stop
pin to 1/2
inch
and

coat
the
outside
of the
grommet with

lubricant. Then, place
the
grommet
on

the stop
pin and
force
it
into
the
man-

ual lever hole. Turn
the
grommet
sev-

eral times
to be
sure
it is
properly

seated.

3.
Readjust
the
stop
pin to the
height shown
in Fig. 18. The pin

height
is
determined
by the
length
of

the
rod end
which
is to be
installed

into
the
grommet.
If the pin
height
is

not adjusted,
the
control
rod may be

pushed
too far
through
the
grommet

causing damage
to the
grommet
re-

taining
lip.

4.
With
the pin
height properly
ad-

justed, position
the
control
rod on the

tool
and
force
the rod
into
the
grom-

met until
the
groove
in the rod
seats

on
the
inner retaining
lip of the
grom-

met.
Be
sure
the rod
protrudes

through
the
grommet approximately

1/4 inch after installation.

CLEANING
AND
INSPECTION

CLEANING

TRANSMISSION

Clean
the
parts with suitable solvent

and
use
moisture-free
air to dry off all

the parts
and
clean
out oil
passages.

The composition clutch plates,

bands
and
synthetic seals should
not

be cleaned
in a
vapor degreaser
or
with
any
type
of
detergent solution.

To clean these parts, wipe them
off

with
a
lint-free cloth.
New
clutch

plates
or
bands should
be
soaked
in

transmission fluid
for
fifteen minutes

before
the
plates
or
bands
are as-

sembled.

CONVERTER

The converter cannot
be
disas-

sembled
for
cleaning.
If
there
is rea-
son
to
believe that
the
converter
con-

tains
an
excessive amount
of
foreign

material,
it
should
be
thoroughly

cleaned.
See the
instructions provided

with
the
Rotunda Automatic Trans-

mission Torque Converter
and
Cooler

Cleaner LRE-60081.

OIL COOLER

When
a
clutch
or
band failure
or

other internal trouble
has
occurred
inprocarmanuals.com

07-01-12
General Transmission Service

07-01-12

the transmission,
any
metal particles

or clutch plate
or
band material that

may have been carried into
the
cooler

should
be
removed from
the
system
by

flushing
the
cooler
and
lines before

the transmission
is put
back into serv-

ice.
In no
case should
an
automatic

transmission having
a
clutch
or
band

failure
or
other internal trouble result-

ing
in
fluid contamination,
be put

back into service without first flushing

the transmission
oil
cooler.

To flush
the oil
cooler, follow
the

instruct!
on >
provided with
the
Rotun-

da Automatic Transmission Torque

Converter
and
Cooler Cleaner
LRE-

60081.

INSPECTION

TURBINE
AND
STATOR
END

PLAY CHECK

A special tool
(Fig. 19)
must
be

used
to
check
the
condition
of the

converter. This special tool
is
used
to

check
the
turbine
and
stator
end
play

and
the
operation
of the
one-way
sta-

tor clutch.

CRUISE-O-MATIC

Too/-T58L-7902-A

C-4 AND C-6 TRANSMISSION

Tool-T59P.7902.Bor 7937-B

ON C-4 AND C-6 TRANSMISSION

Tool-T64L-7902-A
D
1499-E

FIG. 19—Converter Checking Tool

1.
Insert
the
tool (Fig.
19)
into
the

converter pump drive
hub
until
it
bot-

toms.

2.
Install
the
guide over
the con-

verter pump drive
hub.
3.
Expand
the
split fiber bushing
in

the turbine spline
by
tightening
the

adjusting
nut.
Tighten
the
adjusting

nut until
the
tool
is
securely locked

into
the
spline.

4.
Attach
a
dial indicator
to the

tool (Fig.
20 or
21). Position
the
indi-

cator button
on a
converter pump

drive
hub, and set the
dial face
at 0

(zero).

5.
Lift
the
tool upward
as far as it

will
go and
note
the
indicator reading.

The indicator reading
is the
total
end

play which
the
turbine
and
stator

share.
If the
total
end
play exceeds

the limits specified
in
Part 7-5, replace

the converter unit.

6. Loosen
the
adjusting
nut to
free

the split bushing,
and
then remove
the

tool from
the
converter.

STATOR ONE-WAY CLUTCH

CHECK

1.
Install
the
stator outer race hold-

ing tool
in one of the
four holes
pro-

vided
in the
stator (Fig.
20 or 21).

2.
Insert
the
tool
in the
converter

pump drive hub.
As the
tool enters
the

converter,
the
pins will engage
the sta-

tor clutch inner race spline.

3.
Place
a
torque wrench
on the

tool (Fig.
20 or
21).
The
tool (and
sta-

tor inner race) should turn freely

clockwise (from
the
pump drive
hub

inside
the
converter).
It
should lock
up

and hold
a 10
ft-lb pull when
the

wrench
is
turned counterclockwise.

Try
the
clutch
for
lockup
and
hold
in

at least five different locations around

the converter.
On
the
C4
or C6
Auto-

matics,
the
metal ring holding
the

locking tool will have
to be
held
by

hand during this check.

4.
If the
clutch fails
to
lock
up and

hold
a 10
ft-lb torque, replace
the

converter unit.

STATOR
TO
IMPELLER

INTERFERENCE CHECK

1.
Position
the
front pump assem-

bly
on a
bench with
the
spline
end of

the stator shaft pointing
up
(Fig.
22).

2.
Mount
a
converter
on the
pump

so that
the
splines
on the
one-way

clutch inner race engage
the
mating

splines
of the
stator support,
and the

converter
hub
engages
the
pump drive

gear.

3.
While holding
the
pump station-

ary, try
to
rotate the converter counter-

clockwise.
The
converter should
ro-

tate freely without
any
signs
of
inter-

ference
or
scraping within
the
convert-

er assembly.
4.
If
there
is an
indication
of
scrap-

ing,
the
trailing edges
of the
stator

blades
may be
interfering with
the

leading edges
of the
impeller blades.

In such cases, replace
the
converter.

STATOR
TO
TURBINE

INTERFERENCE CHECK

1.
Position
the
converter
on the

bench front side down.

2.
Install
a
front pump assembly
to

engage
the
mating splines
of
the
stator

support
and
stator,
and
pump drive

gear lugs.

3.
Install
the
input shaft, engaging

the splines with
the
turbine
hub (Fig.

23).

4.
While holding
the
pump station-

ary, attempt
to
rotate
the
turbine with

the input shaft.
The
turbine should
ro-

tate freely
in
both directions without

any signs
of
interference
or
scraping

noise.

5.
If
interference exists,
the
stator

front thrust washer
may be
worn,
al-

lowing
the
stator
to hit the
turbine.
In

such cases,
the
converter must
be re-

placed.

The converter crankshaft pilot

should
be
checked
for
nicks
or dam-

aged surfaces that could cause inter-

ference when installing
the
converter

into
the
crankshaft. Check
the con-

verter front pump drive
hub for
nicks

or sharp edges that would damage
the

pump seal.

OUTPUT SHAFT
AND

PRIMARY
SUN
GEAR SHAFT

(FMX TRANSMISSION)

1.
Inspect
the
thrust surfaces
and

journals
for
scores. Inspect
the
inter-

nal gear
for
broken
or
worn teeth.

2.
Inspect
the
aluminum sleeve
for

scores
or
leakage. Inspect
the
ring

grooves
for
burrs.

3.
Inspect
the
keyway
and
drive

ball pocket
for
wear,
and
inspect
the

splines
for
burrs, twist
or
wear.

4.
Inspect
the
output shaft sleeve

for alignment with
the
governor drive

ball (Fig.
24).

5.
Inspect
the
external parking gear

teeth
for
damage
and the
speedometer

drive gear teeth
for
burrs.

6.
If
either
the
output shaft
or
ring

gear
has
been replaced, place
the as-

sembled unit with
the
gear face down

on
the
bench, push
the
shaft down-

ward,
and
check
the
clearance
be-

tween
the top of the
snap ring
and its

groove
(Fig. 25).
If
this clearance
ex-

ceeds 0.002 inch, replace
the
snap ring

with
a
thicker ring
to
reduce
the
clear-

ance
to
less than 0.002 inch. Selectiveprocarmanuals.com

07-01-16
General Transmission bervice
07-01-16

CENTER SUPPORT

PLANETARY CLUTCH
"CAM TYPE" CLUTCH RACE

CHAMFER ON PRODUCTION

PART, ONLY-SERVICE PART NOT CHAMFERED
PLANET CARRIER

D1938-A

FIG. 27—Roller Type Planetary Clutch, Carrier and Center Support

shows wear or deterioration, replace

the seal.

4.
Inspect the seal counterbore and

remove all burrs and scores with cro-

cus cloth.

REAR CLUTCH (FMX)

AND REVERSE-HIGH CLUTCH

(C4 AND C6 AUTOMATIC)

1.
Inspect the drum band surface,

the bushing, and thrust surfaces for

scores. Minor scores may be removed

with crocus cloth. Badly scored parts

must be replaced.

Inspect the clutch piston bore and

the piston inner and outer bearing sur-

faces for scores. Check the air bleed

ball valve in the clutch piston for free

movement. Check the orifice to make

sure it is not plugged.

2.
Check the fluid passages for ob-

structions. All fluid passages must be

clean and free of obstructions.

3.
Inspect the clutch plates for wear

and scoring and check the plates for

fit on the clutch hub serrations. Re-

place all plates that are badly scored,

worn or do not fit freely in the hub

serrations.

4.
Inspect the clutch pressure plate

for scores on the clutch plate bearing

surface. Check the clutch release

spring(s) for distortion.

5.
On an FMX transmission, in-

spect the needle bearing for worn rol-

lers.

FRONT CLUTCH (FMX)

AND FORWARD CLUTCH

(C4 OR C6

TRANSMISSIONS)

1.
Inspect the clutch cylinder thrust

surfaces, piston bore, and clutch plate
serrations for scores or burrs. Minor

scores or burrs may be removed with

crocus cloth. Replace the clutch cylin-

der if it is badly scored or damaged.

2.
Check the fluid passage in the

clutch cylinder for obstructions. Clean

out all fluid passages. Inspect the

clutch piston for scores and replace if

necessary. Inspect the piston check

ball for freedom of movement and

proper seating (Fig. 28).

CLUTCH

CYLINDER

PISTON

SEAL
CLIP

D1939-A

. 28—Clutch Piston Check

Valve

3.
Check the clutch release spring

for distortion and cracks. Replace the

spring if it is distorted or cracked.
4.
Inspect the composition and the

steel clutch plates and the clutch pres-

sure plate for worn or scored bearing

surfaces. Replace all parts that are

deeply scored.

5.
On FMX and C4 transmissions,

check the clutch plates for flatness

and fit on the clutch hub serrations.

Discard any plate that does not slide

freely on the serrations or that is not

flat.

6. Check the clutch hub thrust sur-

faces for scores and the clutch hub

splines for wear.

7.
On an FMX transmission, in-

spect the turbine shaft bearing sur-

faces for scores. If excessive clearance

or scores are found, discard the unit.

Check the splines on the turbine

shaft for wear and replace the shaft if

the splines are excessively worn. In-

spect the bushing in the turbine shaft

for scores. On a C4 or C6 Automatic

transmission, check the input shaft for

damaged or worn splines.

FRONT PUMP AND

STATOR SUPPORT

1.
Inspect the mating surfaces of

the pump body and cover for burrs.

2.
Inspect the drive and driven gear

bearing surface for scores, and check

the gear teeth for burrs. Inspect the

stator support splines for burrs and

wear.

3.
Check the fluid passages for ob-

structions.

4.
If any parts other than the stator

support are found defective, replace

the pump as a unit. Minor burrs and

scores may be removed with crocus

cloth. The stator support is serviced

separately.

5.
On a C4 or C6 Automatic trans-

mission, check the oil ring grooves in

the stator support for nicks, burrs or

damaged edges. On a C6 transmis-

sion, check the large seal ring groove

of the pump body for damage. Check

the gasket mating surface of the pump

body for damage.

REAR SUPPORT

(FMX TRANSMISSION)

1.
Inspect the gasket mating sur-

faces for damage.

2.
Inspect the support bushing for

scores.

3.
Inspect the rear support fluid

passages for obstructions.

4.
Check the fit of the fluid tubes in

the support.procarmanuals.com

07-01-17
General Transmission Service
07-01-17

PRESSURE REGULATOR

(FMX TRANSMISSION)

1.
Inspect the regulator body and

cover mating surface for burrs.

2.
Check all fluid passages for ob-

structions.

3.
Inspect the control pressure and

converter pressure valves and bores for

burrs and scores. Remove all burrs

carefully with crocus cloth.

4.
Check free movement of the

valves in their bores. The valves

should fall freely into the bores when

both the valve and bore are dry.

5.
Inspect the valve springs and

spacers for distortion.

CONTROL VALVE BODY

1.
Clean all parts thoroughly in

clean solvent, and then blow them dry

with moisture-free compressed air.

2.
Inspect all valve and plug bores

for scores. Check all fluid passages for

obstructions. Inspect the check valve

for free movement. Inspect all mating

surfaces for burrs or distortion. In-

spect all plugs and valves for burrs

and scores. Crocus cloth can be used

to polish valves and plugs if care is

taken to avoid rounding the sharp

edges of the valves and plugs.

3.
Inspect all springs for distortion.

Check all valves and plugs for free

movement in their respective bores.

Valves and plugs, when dry, must fall

from their own weight in their respec-

tive bores.

4.
Roll the manual valve on a flat

surface to check it for a bent condi-

tion.

GOVERNOR

1.
Inspect the governor valves and

bores for scores. Minor scores may be
removed from the valves with crocus

cloth. Replace the governor if the

valves or body is deeply scored.

2.
Check for free movement of the

valves in the bores. The valves should

slide freely of their own weight in the

bores when dry. Inspect fluid passages

in the valve body and counterweight

for obstructions. All fluid passages

must be clean.

3.
Inspect the mating surfaces of

the governor body and governor dis-

tributor (C4 or C6 Automatic) for

burrs and distortion. Mating surfaces

must be smooth and flat.

4.
Check the mating surface of the

governor valve and the counterweight

on a FMX transmission for burrs or

scratches.

5.
When cleaning the governor as-

sembly (C4 Automatic), the oil screen

should be removed from the collector

body and thoroughly blown out with

compressed air.

FRONT SERVO (FMX)

AND INTERMEDIATE

SERVO (C4 AND C6

AUTOMATIC)

1.
Inspect the servo bore for cracks

and the piston bore and the servo pis-

ton stem for scores. Check fluid pas-

sages for obstructions. Replace seals

that are damaged.

2.
On an FMX transmission, check

the actuating lever for free movement,

and inspect it for wear. If necessary to

replace the actuating lever or shaft,

remove the retaining pin and push the

shaft out of the bracket.

Inspect the adjusting screw threads

and the threads in the lever for dam-

age.

3.
Check the servo spring and servo

band strut(s) for distortion.

4.
Inspect the cover seal and gasket

cover sealing surface for defects.
REAR SERVO (FMX)

AND LOW-REVERSE SERVO

(C4 TRANSMISSION)

1.
Inspect the servo body for cracks

and the piston bore for scores.

2.
Check the fluid passages for ob-

structions.

3.
Inspect the band and the struts

for distortion. Inspect the band ends

for cracks.

4.
Inspect the servo spring for dis-

tortion.

5.
Inspect the band lining for exces-

sive wear and bonding to the metal

band.

6. On an FMX transmission, check

the servo body to case mating surface

for burrs. Check the accumulator pis-

ton and the check valve for freedom

of movement. Check the actuating

lever socket for scores.

7.
Replace seals that are damaged.

CASE

Inspect the case for cracks and

stripped threads. Inspect the gasket

surfaces and mating surfaces for

burrs.
Check the vent for obstructions,

and check all fluid passages for ob-

structions and leakage (Figs. 10, 11

and 12).

Inspect the case bushing for scores.

Check all parking linkage parts for

wear or damage.

ONE-WAY CLUTCH

1.
Inspect the outer and inner races

for scores or damaged surface area

where the rollers contact the races. If

the outer race on the C6 transmission

is damaged, the low-reverse clutch hub

must be replaced.

2.
Inspect the rollers and springs

for excessive wear or damage.

3.
Inspect the spring and roller case

for bent or damaged spring retainers.procarmanuals.com

07-02-09
C4 Automatic Transmission

07-02-09

11.
Remove the handle from the se-

lector lever.

12.
Install the selector housing and

lever assembly as shown in Figure 8.

Torque the attaching bolts 4-6 ft-lbs.

13.
Connect the dial indicator light.

14.
Install the pointer back-up

shield on the housing and lever assem-

bly.

15.
Install the dial housing and

tighten the attaching screws.

16.
Install the selector lever handle

and tighten the attaching screw.

17.
Position the selector lever in the

D position.

18.
Raise the vehicle. Install the

transmission manual lever rod to the

selector lever. Adjust the manual link-

age.

19.
Lower the vehicle and check the

transmission operation in each selo:c-

tor lever detent position.

BAND ADJUSTMENT

INTERMEDIATE BAND

1.
Clean all the dirt from the band

adjusting screw area. Remove and dis-

card the locknut.

2.
Install a new locknut on the ad-

justing screw. With the tool shown in

Fig. 13, tighten the adjusting screw

until the tool handle clicks. The tool is

a pre-set torque wrench which clicks

and overruns when the torque on the

adjusting screw reaches 10 ft-lbs.

I D1854-A

FIG. 13—Adjusting Intermediate

Band

Tool-T59P-77370-B

D1855-A

FIG. 14—Adjusting Low-Reverse

Band
3.
Back off the adjusting screw ex-

actly 1 3/4 turns.

4.
Hold the adjusting screw from

turning and torque the lock nut to

specification.

LOW-REVERSE BAND

1.
Clean all the dirt from the band

adjusting screw area. Remove and dis-

card the locknut.

2.
Install a new locknut on the ad-

justing screw with the tools shown in

Fig. 14, tighten the adjusting screw

until the tool handle clicks. The tool is

a pre-set torque wrench which clicks

and overruns when the torque on the

adjusting screw reaches 10 ft-lbs.

3.
Back off the adjusting screw ex-

actly 3 full turns.

4.
Hold the adjusting screw from

turning and torque the lock nut to

specification.

OIL PAN AND CONTROL

VALVE BODY REPLACEMENT

1.
Raise the vehicle so the trans-

mission oil pan is accessible.

2.
Drain the transmission fluid.

If the same fluid is to be used

again, filter the fluid through a 100

mesh screen. Re-use the fluid only if it

is in good condition.

3.
Remove the transmission fluid

pan attaching bolts, pan and gasket.

4.
Remove the valve body-to-case

attaching bolts (Fig. 25). Remove the

valve body from the case and the

transmission inner control levers.

5.
Refer to the Major Repair Oper-

ation for control valve body repair op-

eration.

6. Thoroughly clean and remove all

the gasket material from the pan and

the pan mounting face of the case. In-

stall the valve body to the case, engag-

ing the transmission inner control le-

vers with the valve body manual and

downshift valves.

7.
Install the eight valve body to

case attaching bolts. Torque the bolts

to specification. Operate the external

manual and downshift levers to check

for proper travel of the valve body

manual and downshift valves.

8. Place a new gasket on the pan.

Install the pan and attaching bolts.

Torque the bolts to specification. In-

stall the fluid filler tube if it was re-

moved. Torque the attaching nut to

specifications.

9. Lower the vehicle and fill the

transmission with fluid. Check the

transmission pan area for fluid leak-

age.
INTERMEDIATE SERVO

REPLACEMENT

1.
Raise the vehicle and remove the

four servo cover-to-case attaching

bolts.

2.
Remove the servo cover, gasket,

piston, and piston return spring. Re-

move the piston from the cover (Fig.

45).

3.
Remove the piston seals and

cover gasket.

4.
Install new piston seals on the

piston. Lubricate the piston seals with

clean transmission fluid. Install the

servo piston in the cover.

5.
Install the piston retvrn spring in

the case. Place a new gasicet on the

cover. Install the piston and cover into

the transmissic se. Use two 5/16

18 x 1 1/4 bolts, 180 degrees apart to

position the cover against the case.

6. Install the two servo cover at-

taching bolts. Remove the two 1 1/4

inch bolts and install two attaching

bolts.
Torque the bolts to specifica-

tion.

7.
Adjust the intermediate band.

Lower the vehicle and check the trans-

mission fluid level.

8. If the band can not be adjusted

properly, the struts are not in posi-

tion. Remove the pan and valve body.

Install the struts, valve body, pan, and

adjust the band. Refill the transmis-

sion with fluid.

LOW-REVERSE SERVO

PISTON REPLACEMENT

1.
Raise the vehicle on a hoist.

2.
Loosen the reverse band adjust-

ing screw lock nut. Tighten the reverse

band adjusting screw to 10 ft-lbs tor-

que.
(Tightening the screw will insure

that the band strut will be held against

the case by the band, preventing it

from falling down when the reverse

servo piston assembly is removed).

3.
Remove the four servo cover to

case attaching bolts. Remove the iden-

tification tag and vent tube retaining

clip.
Remove the servo cover and s»»^

from the case.

4.
Remove the servo piston from

the case. The piston seal cannot be re-

placed, without replacing the piston.

The seal is bonded to the piston.

5. To remove the piston from the

stem, insert a small screw driver in the

hole of the piston (Fig. 44). Remove

the piston attaching nut.

6. Position the accumulator spring

and spacer (Fig. 43) on the piston

stem. Make sure the crowned side of

the spring is facing toward the rod.

Install.a new piston on the piston re-

taining shaft. Install the attaching nut.

Torque the nut to specification.procarmanuals.com