1969 FORD MUSTANG gas type

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

07-01-08
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

07-01-16
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

07-03-26
FMX Transmission
07-03-26

MANUAL SHAFT

AND LEVER
DETENT SPRING—«^ DETENT PLUNGER

DETENT

/ LEVER
MANUAL SHAFT
NUT

INNER DOWNSHIFT LEVER

/ DOWNSHIFT

/ SHAFT
NUT
TOGGLE LIFT

ijG
LEVER SPRING

TOGGLE LEVER-

PAWL RETURN SPRING-

TOGGLE LEVER
PIN-

PLUG'

D1967-A

FIG. 52—Transmission Case Control Linkage

pawl return spring. Assemble
the tog-

gle lever
to the
link with
the
toggle

link
pin.
Position
the
pawl return

spring over
the
toggle link pin,
and se-

cure
it in
place with
the
washer
and

the small retainer clip
(Fig. 52). In-

stall
the
assembly
in the
transmission

case
by
installing
the
pawl
pin and the

toggle lever
pin.
Install
the
torsion

lever assembly. Position
the
spring
on

the torsion lever with
a
screwdriver.

Make certain that
the
short side
of

toggle does
not
extend beyond
the

largest diameter
of the
ball
or the
tog-

gle lever
pin
(Fig. 52).
Tap the
toggle

lever
in or out as
necessary
to
center

the toggle lever
on the
ball.

4.
Install
the
manual lever
and

shaft
in the
transmission case. Posi-

tion
the
detent lever
on the
shaft,
and

secure
it
with
a nut.
Tighten
the nut

to 20-30 ft-lbs torque. Rotate
the

manual lever
to the
rear
of the
case.

Position
the
detent spring
in the
case.

Press Ram
Hold
the
detent plug
on the
spring

with
a
3/16-inch socket wrench, then

depress
the
spring until
the
plug
is

flush with
the
case. Carefully rotate

the manual lever
to the
front
of the

case
to
secure
the
plug.
A
piece
of

thin walled tubing
may be
used
to

depress
the
plug
if a
small socket

wrench
is not
available.

5.
Position
the
ends
of the
parking

pawl operating
rod in the
detent lever

and toggle lift lever,
and
secure with

the
two
small retaining pins.

6. Install
a new
seal
on the
down-

shift lever shaft, then install
the
lever

and shaft
in the
case. Position
the

inner downshift lever
on the
inner
end

of
the
shaft with
the
mark
O
facing

toward
the
center
of the
case. Install

the lock washer
and nut,
then tighten

the
nut to
17-20 ft-lbs torque.

7.
Check
the
operation
of the
link-

age.
The
linkage should operate freely

without binding.

Handle

Tool -
T64L.7003-BS

REMOVAL
Tool - T64L-7003-A5

INSTALLATION
D 1745-B

FIG. 53—Replacing Transmission Case Bushing
TRANSMISSION CASE

BUSHING REPLACEMENT

1.
If the
transmission case bushing

is
to be
replaced, press
the
bushing

out
of the
case with
the
tools shown
in

Fig.
53.

2.
Install
a new
transmission case

bushing with
the
tool shown
in Fig.

53.

ASSEMBLY
OF
TRANSMISSION

Do
not use
force
to
assemble
mat-

ing parts.
If the
parts
do not
assemble

freely, examine them
for the
cause_pf

the difficulty. Always
use new
gaskets

and seals during
the
assembly opera-

tions.

CLUTCH ASSEMBLIES

1.
Install
the
front band
in the

transmission case
so
that
the
anchor

end
is
aligned with
the
anchor
in the

case.

2.
Make sure
the
thrust washer
is

in place
on the
input shaft. Lift
the

clutch assemblies
out of the
holding

block.
Do not
allow
the
clutches
to

separate.

3.
Install
the
clutch sub-assemblies

in
the
transmission case while posi-

tioning
the
servo band
on the
drum.

Hold
the
units together while install-

ing them (Fig.
25).

CENTER SUPPORT,

ONE-WAY CLUTCH,

PINION CARRIER,
AND

OUTPUT SHAFT

The production center supports
are

chamfered
at the
edge
of the
race

(Fig.
54). The
service center supports

are
not
chamfered.
The
following
as-

sembly procedures cover both types
of

center supports.

Installation—Center Support

With Chamfered Edge

1.
Install
the
center support
and the

rear band
in the
case.

2.
Install
the
primary
sun
gear rear

thrust bearing race, needle bearing,

and front thrust bearing race
if
used

in
the
planet carrier using petroleum

jelly
to
retain them
in
place.

3.
Lubricate
the
bearing surface
on

the center support,
the
rollers
of the

planetary clutch,
and the cam
race
in

the carrier with petroleum jelly
(Fig.

54).

4.
Install
the
planetary clutch
in the

carrier (Fig.
55).procarmanuals.com