air condition FORD MUSTANG 1969 Volume One Chassis

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

07-02-09
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

07-03-10
FMX Transmission
07-03-10

Too/-T69P-7B793-A

ADJUSTING SCREW

REAR SERVO \ LOCK NUT

Tool—7795-C
D1329-A

FIG. 13—Adjusting Rear Band—

Ford-Meteor

If
the
screw
is
found
to be
tighter

than
wrench
capacity
(10
ft-lbs
tor-

que),
loosen
the
screw
and
tighten

until
the
wrench
overruns.

4.
Back off the adjusting screw 1

1/2 turns. Hold the adjusting screw

stationary, and tighten the adjusting

screw lock nut to specifications.

Severe damage may result if the ad-

justing screw is not backed off exactly

1 1/2 turns.

ALTERNATE REAR BAND

ADJUSTMENT—

FORD-METEOR

The tool shown in Fig. 12 may be

used to adjust the rear band.

1.
Place the socket holder on the

3/4-inch socket (Fig. 12). Insert the

T-handle extension through the handle

and socket.

2.
Place the 5/ 16-inch 8-point sock-

et on the extension. Place a torque

wrench on the T-handle extension.

3.
Insert the assembled tool in the

access hole so that it engages the ad-

justing screw and the lock nut.

4.
Loosen the adjusting screw lock

nut.

5.
Torque the adjusting screw to 10

ft-lbs.

6. Remove the torque wrench from

the T-handle extension and back off

the adjusting screw exactly 1 1/2

turns.
Severe
damage
may
result
to

the
transmission
if the
adjusting
screw

is
not
backed
off
exactly
11/2
turns.

7.
Hold the adjusting screw station-

ary and tighten the lock nut securely.

REAR BAND ADJUSTMENT—

FAIRLANE, MONTEGO

MUSTANG AND COUGAR

Adjustment of the rear band may

be performed either internally or ex-

ternally. Use the internal band adjust-

ment procedures when making a nor-

mal (in-vehicle) band adjustment. Use
ADJUSTING SCREW

LOCK NUT
I
IN

TorqueWrench REAR SERVO APPLY LEVER

D2028-A

FIG. 14—Adjusting Rear Band—

Fairlane, Montego, Mustang and

Cougar

the external adjustment procedure

only when the transmission has been

removed from the vehicle, or when all

available internal adjustment has been

taken up and a further band adjust-

ment is required.

Internal Band Adjustment

1.
Drain the fluid from the trans-

mission. If the same fluid is to be

used again in the transmission after

the band adjustment, filter the fluid

through a 100-mesh screen as it drains

from the transmission. Re-use the

fluid only if it is in good condition.

2.
Remove and thoroughly clean

the pan and filter. Discard the pan

gasket.

3.
Loosen the rear servo adjusting

screw lock nut.

4.
Pull the adjusting screw end of

the actuating lever away from the

servo body, and insert the spacer tool

shown in Fig. 14 between the servo

accumulator piston and the adjusting

screw.
Be
sure
the
flat
surfaces
of the

tool
are
positioned
squarely
between

the
adjusting
screw
and the
accumula-

tor
piston.
The
tool must
not
touch

the servo
piston
and the
tool
handle

must
not
touch
the
servo
piston
spring

retainer.

5.
Using a torque wrench with an

Allen head socket (Fig. 14), tighten

the adjusting screw to 24 in-lbs tor-

que.

6. Back off the adjusting screw

1-1/2 turns. Hold the adjusting screw

stationary and tighten the adjusting

screw lock nut sequrely. Remove the

spacer tool.

7.
Install the transmission fluid fil-

ter and clip. Install the pan using a

new gasket.

8. Fill the transmission with fluid.
D2029-A

FIG. 15—Rear Servo Lever

Adjusting Screw Dimension—

Fairlane, Montego, Mustang and

Cougar

External Band Adjustment

1.
With the transmission mounted

in a holding fixture, loosen the inter-

nal rear servo adjusting screw lock nut

(Fig. 15).

2.
Set the internal adjusting screw

to the dimension shown in Figure 15.

Tighten the lock nut.

3.
With the internal adjusting screw

properly adjusted, loosen the external

adjusting screw lock nut.

4.
Using a torque wrench with an

Allen head socket, tighten the adjust-

ing screw to 10 ft-lbs torque.

5.
Back off the adjusting screw

1-1/2 turns.

6. Hold the adjusting screw from

turning and torque the lock nut to

specification.

GOVERNOR REPLACEMENT

1.
Raise the vehicle so that the

transmission extension housing is ac-

cessible.

2.
Drain the fluid from the trans-

mission.

3.
Disconnect the drive shaft from

the rear axle and slide the front yoke

out of the extension housing.

4.
Disconnect the speedometer

cable from the extension housing.

5.
Remove the two bolts that secure

the extension housing to the engine

rear support.

6. Remove the nut and bolt that se-

cures the engine rear support to the

crossmember.

7.
Raise the transmission high

enough to provide clearance for the

rear mount.

8. Lift the engine rear support from

the crossmember.

9. Lower the jack until the exten-

sion housing just clears the crossmem-procarmanuals.com