1969 FORD MUSTANG oil type

04-04-07
Rear Axle — Ford Light-Duty (WER)
04-04-07

RUNOUT CHECK

E 1573-A

FIG. 70—Checking Backlash and Runout—Light-Duty (WER) Axle

All service operations on the differ-

ential case assembly can be performed

with the axle housing in the vehicle.

1.
Raise the vehicle on a hoist.

2.
Position the drain pan under the

axle housing. Loosen the housing

cover attaching bolts. Drain the lubri-

cant from the housing.

3.
Make scribe marks on the drive

shaft end yoke and the rear axle shaft

companion flange to insure proper po-

sition of the drive shaft at assembly.

Disconnect the driveshaft from the

rear axle companion flange. Be care-

ful to avoid dropping the loose univer-

sal joint bearing cups. Hold the cups

on the spider with tape. Mark the

cups so that they will be in their origi-

nal position in relation to the flange

when they are reassembled. Remove

the drive shaft from the transmission

extension housing. Install an oil seal

replacer tool in the transmission ex-

tension housing to prevent transmis-

sion leakage. Refer to the transmis-

sion group for the appropriate tool.

4.
Raise the vehicle and place

jack-type stands under the rear frame

crossmember. Lower the vehicle on a

hoist and allow the axle to lower as

far as possible.

5.
Remove the axle housing cover

and gasket. Discard the gasket.

6. Perform the Inspection Before

Disassembly of Carrier procedure.

Refer to Part 4-1, Section 3 of this

Shop Manual.

7.
Remove the attaching (Tinner-

man) nuts that secure the rear brake

drums to the axle shaft flanges, and

then remove the drums.

8. Working through the differential

case opening, remove the pinion shaft

lock bolt and pinion shaft (Fig. 2).

9. Push the axle shafts inward

toward the center of the axle housing.

Remove the C-locks (Fig. 3) from the

inner ends of the rear axles. Remove

the axle shafts from the housing. Ex-

treme care must be used to avoid con-

tacting the axle shaft seal lip with any
portion of the axle shaft except the

seal journal.

10.
Remove the bearings and oil

seals from the axle housing as shown

in Fig. 4.

11.
Remove the pinion side gears

and the side gear thrust washers.

12.
Remove both side bearing ad-

justing nut locks (bolts).

13.
Install a dial indicator (Fig. 10),

and check and record the backlash

and ring gear runout.

14.
Mark one differential bearing

cap and the case to help in positioning

the parts properly during assembly.

15.
Remove the bearing cap retain-

ing bolts. Remove the bearing caps,

cups,
adjusting nuts and case assem-

bly.

16.
Hold the drive pinion flange

and remove the pinion nut (Fig. 11).

Discard the nut.

17.
Remove the pinion flange (Fig.

12).

18.
Drive the pinion out of the

front bearing cone and remove it from

the carrier housing. Remove and dis-

card the bearing spacer.

19.
With a hammer and drift re-

move the pinion shaft oil seal out

through the front of the carrier hous-

ing.

20.
Remove the pinion rear bearing

from the drive pinion shaft (Fig. 13).

21.
Measure the shim which is

found under the bearing cone with a

Tool-T57L-485T-A

or 4851-K

El 906A
Tool
-
T6SL-485UA
\

E 1574-A

FIG. 12—Drive Pinion Flange

Removal

1575-A

FIG. 13—Pinion Rear Bearing

Removal

00/
- T57L-4220-A

FIG. 11—Typical Drive Pinion

Shaft Nut Removal
E 1576-A

FIG. 14—Differential Bearing

Removal

micrometer. Record the thickness of

the shim.

DISASSEMBLY OF

DIFFERENTIAL CASE

1.
If the 2 differential side bearings

are to be removed from the differen-

tial case, use the tool shown in Fig.

14.procarmanuals.com

04-04-09
Rear Axle — Ford Light-Duty (WER)
04-04-09

case several revolutions in each direc-

tion while the bearings are loaded to

seat the bearings in their cups. This

step is important.

5. Again loosen the right nut to re-

lease the preload. Check to see that

the left nut contacts the bearing cup.

Using the dial indicator set-up shown

in Fig. 13, Part 4-1, adjust the preload

to 0.008 to 0.012 case spread for new

bearings or 0.005 to 0.008 for the

original bearings, if re-used.

6. Check the runout of the differen-

tial case flange with a dial indicator.

If the runout does not now exceed

specifications, install a new ring gear,

if the runout still exceeds specifica-

tions,
the ring gear is true and the

trouble is due to either a defective

casting or worn bearings.

7.
Remove the differential case

from the carrier and remove the side

bearings from the case.

8. Install new bearings on the case

hubs,
and again install the differential

assembly in the carrier without the

ring gear.

9. Check the case runout again with

the new bearings. If the runout is now

within limits, the old bearings were

excessively worn. Use the new bear-

ings for assembly. If the runout is still

excessive, the case is defective and

should be replaced.

ASSEMBLY OF AXLE

Refer to Part 4-1 of this Shop

Manual for Cleaning and Inspection

procedures before starting assembly

operations.

ASSEMBLY OF

DIFFERENTIAL CASE

1.
Place the ring gear on the differ-

ential case. Install the retaining bolts

and torque them to specification.

2.
If the differential bearings were

removed, press them on as shown in

Fig. 17.

3.
Insert the pinion gear shaft lock

bolt into the case (loosely).

INSTALLATION OF DRIVE

PINION AND

DIFFERENTIAL CASE

1.
Place the shim(s) and pinion rear

bearing cone on the pinion shaft.

Press the bearing and shim(s) firmly

against the pinion shaft shoulder (Fig.

18).

2.
Place a new pinion bearing pre-

load (collapsible) spacer on the pinion

shaft.
REAR BEARING

CONE AND

ROLLER
Press Ram

FIG. 18—Drive Pinion Bearing

Installation

3.
Lubricate the pinion rear bearing

with axle lubricant.

4.
Lubricate the pinion front bear-

ing with axle lubricant. Lubricate the

pinion front bearing cone and place it

in the carrier housing.

5.
Install a new oil seal in the car-

rier casting (Fig. 19).

6. Insert the drive pinion shaft (U-

joint) flange into the pinion seal and

hold it firmly against the pinion front

bearing cone. From the rear of the

carrier casting, insert the pinion shaft

into the flange.

7.
Apply a small amount of lubri-

cant to the washer side of the flange

nut and start the nut. Use a new nut.

Hold the flange with the tool shown in

Fig. 12 and tighten the pinion shaft

nut. As the pinion shaft nut is tight-

ened, the pinion shaft is pulled into

the front bearing cone and into the

flange.

As the pinion shaft is pulled into

the front bearing cone, pinion shaft

end play is reduced. While there is

still end play in the pinion shaft, the

flange and cone will be felt to bottom.

This indicates that the bearing cone

and flange have bottomed on the col-

lapsible spacer.

From this point, a much greater

torque must be applied to turn the

pinion shaft nut, since the spacer must

be collapsed. From this point, also,

the nut should be tightened very slow-

ly and the pinion bearing preload play

checked often, so that the pinion bear-

ing preload does not exceed the speci-

fied limits.

If the pinion shaft nut is tightened

to the point that pinion bearing pre-

load exceeds the limits, the pinion

shaft must be removed and a new col-

lapsible spacer installed. Do not de-

crease the preload by loosening the
/
Tool
-
T58L-4676-A

/ E
1581-A

FIG. 19—Installing Pinion Seal

E 1582-A

FIG. 20—Checking Pinion Bearing

Preload

pinion shaft nut. This will remove the

compression between the pinion front

and rear bearing cones and the col-

lapsible spacer and may permit the

front bearing cone to turn on the pin-

ion shaft.

8. As soon as there is preload on

the bearings, turn the pinion shaft in

both directions several times to seat

the bearing rollers.

9. Adjust the bearing preload to

specification. Measure the preload

with the tool shown in Fig. 20.

10.
Apply a thin coating of lubri-

cant on the bearing bores so that the

differential bearing cups will move

easily.

11.
Place the cups on the bearings

and set the differential case assembly

in the carrier casting.

If the gear set is of the non-hunting

or partial non-hunting type, assemble

the differential case and ring gear as-

sembly in the carrier so that the

marked tooth on the pinion indexes

between the marked teeth on the ring

gear as shown in Fig. 49, Part 4-2.

In almost every case of improper

assembly (gears assembled out of

time),
the noise level and probability

of failure will be higher than they

would be with properly assembled

gears.

When installing the hunting type

gear set (no timing marks), assembleprocarmanuals.com

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

07-01-06
General Transmission Service

07-01-06

MAKE MARK HERE

BELLOWS INTACT
BELLOWS FAILED

FIG. 9—Checking Vacuum Unit Bellows

tester equipped with a vacuum pump

(Fig. 8). Set the regulator knob so

that the vacuum gauge reads 18 inches

with the end of the vacuum hose

blocked off.

Then connect the vacuum hose to

the transmission vacuum unit. If the

gauge still reads 18 inches, the vacuT

urn unit diaphragm is not leaking. As

the hose is removed from the trans-

mission vacuum unit, hold a finger

over the end of the control rod. When

the hose is removed, the internal

spring of the vacuum unit should push

the control rod outward.

ALTITUDE

COMPENSATING-TYPE

The vacuum diaphragm should be

checked for ruptured or damaged bel-

lows.
Check the diaphragm assembly

as follows:

1.
Remove the diaphragm and

throttle valve rod from the transmis-

sion.

2.
Insert a rod into the diaphragm,

making sure that the rod is buttonec

in the hole. Make a reference mark on

the rod where it enters the diaphragm

hole.

3.
Hold the assembly in such a way

that the end of the rod is resting on

the weighing surface of a scale (Fig.

9).

4.
Gradually press down on the dia-

phragm assembly until the rod is

pressed into the diaphragm body. If

the reference mark on the rod is still
visible with 12 pounds of force regis-

tered on the scale, the bellows are in-

tact. If the mark disappears before 4

pounds of force is exerted, the bellows

have failed and the diaphragm must

be replaced. If the bellows are intact,

then perform various pressure checks.

SHIFT POINT CHECKS

Check the minimum throttle up-

shifts in D. The transmission should

start in first gear, shift to second, and

then shift to third, within the shift

points specified in the specification

section.

While the transmission is in third

gear, depress the accelerator pedal

through the detent (to the floor). The

transmission should shift from third to

second or third to first, depending on

the vehicle speed.

Check the closed throttle downshift

from third to first by coasting down

from about 30 mph in third gear. The

shift should occur within the limits

specified in the specification section.

When the selector lever is at 2, the

transmission can operate only in sec-

ond gear.

With the transmission in third gear

and road speed over 30 mph, the

transmission should shift to second

gear when the selector lever is moved

from D to 2 to 1. The transmission

will downshift from second or third to

first gear when this same manual shift

is made below approximately 25 mph

with a C4 transmission, 30 mph with
D 1791.A

a C6 transmission or 35 mph with an

FMX transmission. This check will

determine if the governor pressure and

shift control valves are functioning

properly.

During the shift point check opera-

tion, if the transmission does not shift

within specifications or certain gear

ratios cannot be obtained, refer to the

Ford Car and Truck Diagnosis Manu-

al to resolve the problem.

AIR PRESSURE CHECKS

A NO DRIVE condition can exist,

even with correct transmission fluid

pressure, because of inoperative

clutches or bands. Erratic shifts could

be caused by a stuck governor valve.

The inoperative units can be located

through a series of checks by subst-

ituting air pressure for the fluid pres-

sure to determine the location of the

malfunction.

To make the air pressure checks,

drain the transmission fluid and re-

move the oil pan and the control valve

body assembly. The inoperative units

can be located by introducing air pres-

sure into the transmission case passa-

ges leading to the clutches, servos, and

governor (Figs. 10, 11 or 12).

HYDRAULIC SYSTEM BENCH

TESTS (FMX TRANSMISSION)

After the transmission has been as-

sembled and is ready for installationprocarmanuals.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

07-01-16
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

07-03-21

FMX Transmission

07-03-21

Tool—1175-AB

Tool— T50T-100-A

D1962-A

FIG. 41—Removing Front Pump

Seal

8. Install
the oil
seal remover

shown
in Fig. 41.
Then pull
the
front

seal from
the
pump body.

9. Clean
the
pump body counter-

bore.
Then inspect
the
bore
for
rough

spots.
Smooth
up the
counterbore

with crocus cloth.

10.
Remove
the
pump body from

the transmission case.

11.
Coat
the
outer diameter
of a

new seal with FoMoCo Sealing
Com-

pound,
or its
equivalent. Then position

the seal
in the
pump body. Drive
the

seal into
the
pump body with
the
tool

shown
in Fig. 42
until
the
seal
is
firm-

ly seated
in the
body. Tool 77837
may

be reworked
(Fig. 43) to
install
the

latest type seal.

FRONT PUMP

BODY

D1963-A

FIG. 42—Installing Front Pump

Seal

CHAMFER
TO
REMOVE BURRS

FRONT PUMP
OIL
SEAL

INSTALLATION

MACHINE
OFF

D1964-A

FIG.
43—
Front Pump Seal

Installing Tool Modification
12.
Place
the
pump driven gear
in

the pump body with
the
mark
on the

gear facing down. Install
the
drive

gear
in the
pump body with
the
cham-

fered side
of the
flats facing down.

13.
Install
the
stator support
and

attaching screws. Check
the
pump

gears
for
free rotation.

REAR SUPPORT BUSHING

REPLACEMENT

1.
Remove
the
three pressure tubes

from
the
support housing.

2.
Remove
the
rear support bushing

if
it is
worn
or
damaged.
Use a
cape

chisel
and cut
along
the
bushing seam

until
the
chisel breaks through
the

bushing wall.
Pry the
loose ends
of

the bushing
up
with
an awl and re-

move
the
bushing.

3.
Press
a new
bushing into
the

support housing with
the
tool shown

in
Fig. 44.

Too/
-
T64L-7003-A2
Handle

D 2050-A

FIG. 44—Installing Rear Support

Housing Bushing
4.
Install
the
pressure tubes.

PRESSURE REGULATOR

1.
Remove
the
valves from
the re-

gulator body.

2.
Remove
the
regulator body cover

attaching screws,
and
remove
the

cover
(Fig. 45).

3.
Remove
the
separator plate.

4.
Wash
all
parts thoroughly
in

clean solvent
and
blow
dry
with

moisture-free compressed
air.

5.
Inspect
the
regulator body
and

cover mating surfaces
for
burrs.

6. Check
all
fluid passages
for ob-

structions.

7.
Inspect
the
control pressure
and

converter pressure valves
and
bores
for

burrs
and
scores. Remove
all
burrs

carefully with crocus cloth.

8. Check
the
free movement
of the

valve
in
their bores. Each valve should

fall freely into
its
bore when both
the

valve
and
bore
are dry.

9. Inspect
the
valve springs
for dis-

tortion.

10.
Position
the
separator plate
on

the regulator cover.

11.
Position
the
regulator cover
and

separator plate
on the
regulator body,

and install
the
attaching screws.
Tor-

que
the
screws
to
specification.

12.
Insert
the
valves
in the
pressure

regulator body
(Fig. 45).

CONTROL VALVE BODY

During
the
disassembly
of the con-

trol valve assembly, avoid damage
to

valve parts
and
keep
the
valve parts

clean. Place
the
valve assembly
on a

clean shop towel while performing
the

disassembly operation.
Do not
sepa-

REGULATOR

BODY
CONTROL PRESSURE

VALVE

SEPARATOR
CONVERTER RETAINER

PRESSURE CONVERTER PRESSURE

VALVE SPRINGS

COVER
RETAINER

1111

1111

D1965-A

FIG. 45— Pressure Regulator Disassembledprocarmanuals.com