torque FORD MUSTANG 1969 Volume One Chassis

05-04-02

Specifications

05-04-02

TORQUE LIMITS (FT-LBS)

Description

Lower Access Clutch Cover Pan to Flywheel Housing Bolts (Cast Iron Housing)

Transmission Assembly to Flywheel Housing Bolts

Pressure Plate and Cover Assembly to Flywheel Attaching Bolts

Clutch Release Equalizer Frame Bracket Bolts

Clutch Pedal Free Travel Adjustment Nut

Flywheel Housing to Cylinder Block Bolts
6-Cylinder

8-Cylinder

Clutch Pedal Assist Spring Bracket to Brake Pedal Support Bracket
Meteor

Ford,
Mercury

17-20

37-42

12-20

15-24

15-20

_

12-17
Mustang,
Cougar

Fairlane, Montego, Falcon

-

-

12-20

15-24

15-20

23-33

40-50

12-17

SPECIAL TOOLS

Tool No.

A-37H

T61L-7657-Aor B

T57L-7657-A

T64P-7657-A
Description

Clutch Disc Aligner-Universal

Transmission Extension Housing Oil Seal

Replacer
Tool No.

CJ91B

T64L-6392-A

T49P-7580-A
Description

Universal Joint Bearing Replacer

Dia-L-lgner Gauge

Clutch Release Bearing Replacerprocarmanuals.com

06-02-09
Ford Design Three Speed Transmission

06-02-09

PRESS
RAM

OUTPUT SHAFT

SYNCHRONIZER
PRESS
RAM

OUTPUT SHAFT
Tool-T63P7025-A

SYNCHRONIZER

HUB

REMOVAL INSTALLATION c 1718-A

FIG. 22—Removing
and
Installing First
and
Reverse Synchronizer

5.
The
first
and
reverse synchroniz-

er
hub is a
press
fit on the
output

shaft.
To
eliminate
the
possibility
of

damaging
the
sychronizer assembly,

install
the
synchronizer
hub
with
the

teeth
end of the
gear facing toward

the rear
of the
shaft, using
an
arbor

press
as
shown
in Fig. 22. Do not at-

tempt
to
remove
or
install
the hub by

hammering
or
prying.

6. Place
the
blocking ring
on the

tapered machined surface
of the
first

gear.

7.
Slide
the
first gear onto
the out-

put shaft with
the
blocking ring

toward
the
rear
of the
shaft. Rotate

the gear
as
necessary
to
engage
the

three notches
in the
blocking ring with

the synchronizer inserts. Secure
the

first gear with
the
thrust washer
and

snap ring.

8. Slide
the
blocking ring onto
the

tapered machined surface
of the sec-

ond gear. Slide
the
second gear with

blocking ring
and the
second
and
third

gear synchronizer onto
the
mainshaft.

The tapered machined surface
of the

second gear must
be
toward
the
front

of
the
shaft. Make sure that
the

notches
in the
blocking ring engage

the synchronizer inserts. Secure
the

synchronizer with
a
snap ring.

9. Coat
the
bore
of the
input shaft

and gear with
a
thin film
of
grease.
A

thick film
of
grease will plug
the lu-

bricant holes
and
prevent lubrication

to
the
bearings. Install
the 15
bearings

(Fig.
15) in the
bore.

10.
If
working
on a RAT
model

transmission, install
the
input gear

and bearing through
the top of the

case
and
through
the
bore
in
front
of

the case.
On RAN
models,
me
input

shaft
is
installed through
the
front
of

the transmission. Install
the
snap ring

in
the
bearing groove.
11.
Position
the
output shaft
as-

sembly
in the
case. Position
the sec-

ond
and
third-speed shift fork
on the

second
and
third-speed synchronizer.

12.
Place
a
detent plug spring
and

a plug
in the
case
(Fig. 9).
Place
the

second
and
third-speed synchronizer
in

the second speed position (toward rear

of transmission). Align
the
fork
and

install
the
second
and
third-speed shift

rail.
It
will
be
necessary
to
depress
the

detent plug
to
enter
the
rail
in the

bore.
Move
the
rail inward until
the

detent plug engages
the
forward notch

(second-speed position).

13.
Secure
the
fork
to the
shaft

with
the set
screw. Move
the
synchro-

nizer
to the
neutral position.

14.
Install
the
interlock plug
in the

case.
If the
second
and
third-speed

shift rail
is in the
neutral position,
the

top
of the
interlock will
be
slightly

lower than
the
surface
of the
first
and

reverse shift rail bore.

15.
Move
the
first
and
reverse
syn-

chronizer forward
to the
first-speed

position. Place
the
first
and
reverse

shift fork
in the
groove
of the
first

and reverse synchronizer. Rotate
the

fork into position
and
install
the
first

and reverse shift rail. Move
the
rail

inward until
the
center notch (neutral)

is aligned with
the
detent bore. Secure

the fork
to the
shaft with
the set

screw.

16.
Install
a new
shift rail expan-

sion plug
in the
front
of the
case.

17.
Hold
the
input shaft
and
block-

ing ring
in
position. Then move
the

output shaft forward
to
seat
the
pilot

in
the
roller bearings
of the
input

gear.

18.
Tap the
input gear bearing into

place
in the
case while holding
the

output shaft
to
prevent
the
roller bear-

ings from dropping. Install
the
front
C1806-A

FIG. 23—Installing Output Shaft

Rear Bearing

bearing retainer
and new
gasket
mak-

ing sure that
the oil
return slot
is at

the bottom
of the
case. Install
and

torque
the
attaching screws
to
specifi-

cation.

19.
Install
the
large snap ring
on

the rear bearing. Place
the
bearing
on

the output shaft with
the
snap ring

end toward
the
rear
of the
shaft. Press

the bearing into place with
the
tool

shown
in Fig. 23.
Secure
the
bearing

to
the
shaft with
a
snap ring.

20.
On
some models, hold
the

speedometer drive gear lock ball
in

the detent
and
slide
the
speedometer

drive gear into place. Secure
the
gear

with
a
snap ring.
On
models equipped

with
the new
design retainer, install

the speedometer drive gear retaining

clip
on the
shaft with
the
lower tang

in
the
retaining hole. Align
the
groove

in
the
gear with
the
clip
and
slide
the

gear forward until
the
upper tang
on

the clip locks
the
gear
(Fig. 9).

21.
Place
the
transmission
in the

vertical position. Working through
the

drain hole
in the
bottom
of the
case,

align
the
bore
of the
countershaft gear

and
the
thrust washers with
the
bore

of
the
case with
a
screwdriver.

22.
Working from
the
rear
of the

case,
push
the
dummy shaft
out of the

countershaft gear with
the
counter-

shaft. Before
the
countershaft
is com-

pletely inserted
in the
bore, make sure

that
the
hole that accommodates
the

roll
pin is
aligned with
the
hole
in the

case.
Drive
the
shaft into place
and in-

stall
the
roll
pin. On all 8
cylinder
ve-

hicles
and
Ford
6
cylinder models,
the

countershaft
is a
press
fit in the
case.

On
6
cylinder models with model

RAN transmissions there
is a
counter-

shaft-to-case clearance
of
0.020 inch

at
the
front bore
and 0.010 at the
rearprocarmanuals.com

06-02-10
Ford Design Three Speed Transmission
06-02-10

bore.
On these 6 cylinder models, in-

stall a new expansion plug in the

countershaft bore at the front of the

case.

23.
Coat a new extension housing

gasket with sealer and position it on

the case.

24.
Install lock washers on the five

attaching screws. Dip the threads of

the cap screws in sealer. Secure the

housing to the case and torque the
cap screws to specification.

25.
Install the filler and drain plugs

(if equipped) in the case. Make sure

that the magnetic plug is installed in

the bottom of the case.

7.6. Place the transmission in gear.

Pour lubricant over the entire gear

train while rotating the input or out-

put shaft.

27.
Install the remaining detent
plug in the case. Install the long

spring (which is retained by the case)

to secure the detent plug.

28.
Coat a new cover gasket (Fig.

5) with sealer. Secure the cover with

cap screws. Torque the screws to spec-

ification.

29.
Check the operation of the

transmission in all of the gear posi-

tions.procarmanuals.com

06-03-03
Ford Design Four-Speed Transmission
06-03-03

cable from the equalizer lever and sep-

arate the lever from the crossmember.

5.
Remove the hairpin retainer se-

curing the cable to the transmission

rear support crossmember, and then

pull the cable assembly forward and

out of the crossmember.

6. Remove the retaining clip, flat

washer, and spring washer that se-

cures the shift rods to the shift levers.

7.
Remove the bolts that attach the

shift linkage control bracket to the ex-

tension housing and position the as-

sembly out of the way.

8. Support the engine with a trans-

mission jack and remove the extension

housing-to-engine rear support attach-

ing bolts.

9. Raise the rear of the engine high

enough to remove the weight from the

crossmember. Remove the bolts re-

taining the crossmember to the frame

side supports and remove the

crossmember.

10.
Support the transmission on a

jack and remove the bolts that attach

the transmission to the flywheel hous-

ing.

11.
Move the transmission and jack

rearward until the transmission input

shaft clears the flywheel housing. If

necessary, lower the engine enough to

obtain clearance for transmission re-

moval.

Do not depress the clutch pedal

while the transmission is removed.
INSTALLATION

1.
Make sure that the mounting

surface of the transmission and the

flywheel housing are free of dirt,

paint, and burrs. Install two guide

pins in the flywheel housing lower

mounting bolt holes. Move the trans-

mission forward on the guide pins

until the input shaft splines enter the

clutch hub splines and the case is posi-

tioned against the flywheel housing.

2.
Install the two upper transmis-

sion to flywheel housing, mounting

bolts snug, and then remove the two

guide pins. Install the two lower

mounting bolts. Torque all mounting

bolts to specifications.

3.
Raise the rear of the engine and

install the crossmember. Install and

torque the crossmember attaching

bolts to specifications, then lower the

engine.

4.
With the transmission extension

housing resting on the engine rear

support, install the transmission ex-

tension housing attaching bolts. Tor-

que the bolts to specifications.

5.
Position the shift linkage control

bracket to the extension housing and

install the attaching bolts.

6. Secure each shift rod to its re-

spective lever with the spring washer,

flat washer, and retaining pin.

7.
Guide the parking brake cable

assembly through the hole in the
transmission rear support crossmemb-

er. Secure the cable assembly to the

crossmember with the hair pin retain-

er.

8. Insert the parking brake front

cable in the equalizer and install the

equalizer in the bracket on the

crossmember. Secure the parking

brake rear cable to the equalizer.

9. Connect the speedometer cable

to the extension housing.

10.
Remove the extension housing

installation tool and slide the forward

end of the drive shaft over the trans-

mission output shaft. Connect the

drive shaft to the rear U-joint flange.

11.
Place both forward gear shift

levers and the reverse shift lever in the

neutral position and insert a 1/4 inch

diameter alignment tool in the shift

linkage alignment hole (Fig. 17). It

may be necessary to loosen the adjust-

ment nuts to install the alignment

tool. Adjust the linkage as necessary

and tighten the adjustment nuts to

specifications. Remove the alignment

tool.

12.
Fill the transmission to the

proper level with the specified lubri-

cant.

13.
Lower the car. Check tne shift

and crossover motion for full shift en-

gagement and smooth crossover oper-

ation.

MAJOR REPAIR OPERATIONS

DISASSEMBLY

1.
Mount the transmission in a

holding fixture and drain the lubri-

cant.

2.
Remove the cover attaching

screws from the case. Lift the cover

and gasket from the case.

3.
Remove the long spring that re-

tains the detent plug in the case (Fig.

4).
Remove the detent plug with a

small magnet.

4.
Remove the extension housing

attaching screws and lock washers.

Remove the housing and the gasket.

5.
Remove the input shaft bearing

retainer attaching screws. Slide the re-

tainer off the input shaft.

6. Support the countershaft gear

with a wire hook. Working from the

front of the case, push the counter-

shaft out the rear of the case as shown

in Fig. 3. Lower the countershaft to

the bottom of the case with the wire

hook. Remove the hook.
Tool-T64P-711hA

COUNTERSHAFT

C2073-A

FIG. 3—Removing Countershaft

From Case

7.
Place the first and second-speed

gear shift lever and the reverse shift

lever in the neutral position. Place the

third and fourth-speed gear shift lever

in the third-speed position.

8. Remove the attaching screw

from the third and fourth-speed shift

fork. Tap on the inner end of the shift

rail to unseal the expansion plug from
the front of the case. Then withdraw

the third and fourth-speed shift rail

from the front of the case. Do not

lose the interlock pin from the shift

rail.

9. Remove the set screw from the

first and second-speed shift fork.

Slide the first and second-speed shift

rail out the rear of the case.

10.
Remove the interlock plug and

the detent plug from the top of the

case (Fig. 4) with a magnet.

11.
On some models, remove the

snap ring that secures the speedometer

drive gear to the output shaft. Slide

the gear off the shaft, then remove the

speedometer gear drive ball. On mod-

els equipped with the new design re-

tainers, depress the tang on the speed-

ometer drive gear retaining clip and

slide the speedometer gear off the

shaft. (Fig. 5).

12.
Remove the snap ring that se-

cures the output shaft bearing to the

shaft.procarmanuals.com

06-03-05
Ford Design Four-Speed Transmission

06-03-05

DETAIL
4

FORD
AND
MERCURY

DETAIL
5

COUGAR. FAIRLANE,

FALCON,
MONTEGO,

AND MUSTANG
REVERSE SHIFT

RAIL

C1533-B

FIG. 6—Removing Output Shaft Bearing

3.
Remove
and
discard
the
O-ring

from each
cam and
shaft (Fig.
12).

4.
Dip the new
Orings
in
gear
lu-

bricant
and
install them
on the cam

and shafts.

5.
Slide each cam
and
shaft into
its

respective bore
in the
transmission

case.

6. Secure each shaft lever with
a

flat washer, lock washer
and nut.

GEAR SHIFT CONTROL

ASSEMBLY

1.
Remove
the
four screws attach-

ing
the
lower boot
to the
floor
pan.

2.
Remove the two bolts that secure

the gear shift lever
to
the shift control

assembly.

THIRD AND,

FOURTH

SPEED

SHIFT

FORK

FIRST
AND

REVERSE

SPEED

SHIFT

FORK
3.
Remove
the two
piece lock nuts

that secure
the
shift rods
to the
shift

levers.

4.
Remove
the
three bolts attaching

the control assembly
to the
extension

housing. Lower
the
control assembly

and boot
and
remove
the
control
as-

sembly from
the
boot.

5.
Remove the back-up light switch.

6. Remove
the
outer
nut
from
the

selector lever shaft
and
slide
the
shaft

from
the
control assembly.

7.
Lift
the
outer support bracket,

rubber washer, first-second,
and

third-fourth selector levers
off the as-

sembly (Fig.
13).

8. Remove
the two
bolts retaining

the inner support bracket
to the
back

THIRD
AND
FOURTH

SPEED SYNCHRONIZER

OUTPUT SHAFT MOVED

TO RIGHT SIDE
OF
CASE

C2075-A
C2077-A
Tool-T52T-

C2076-A

FIG. 9—Rotating Reverse

Shift Rail

plate. Lift
the
inner support bracket,

selector arm, and reverse selector lever

from
the
back plate.

9. Lubricate
all
mating surfaces

with lithium grease before assembly.

10.
Position
the
reverse gear selec-

tor lever, selector
arm and the
inner

support bracket
on the
back plate.

The reverse gear selector lever will

have
a
flat spot
on the
top
of
the lever

to distinguish
it
from
the
third-fourth

selector lever. Install the two retaining

bolts finger tight.

11.
Insert
a 1/4
inch gauge
pin

through
the
alignment holes
of the se-

lector levers
and
support brackets.

Line
up the
gauge
pin
perpendicular

to the back plate. Torque the two sup-

port bracket-to-back plate retaining

nuts
to
specification
and
remove
the

gauge
pin.

12.
Position
the
rubber washer,

first-second
and
third-fourth selector

levers
in the
outer support bracket.

Position this assembly against
the

inner support
so
that the selector lever

shaft holes
in the
selector levers
and

support brackets
are
aligned.

13.
Install
the
selector lever shaft

"~ REVERSE IDLER

GEAR SHAFT

Tool-T64P-7140

C2078-A

FIG. 7—Removing Shift Fork

From Case
FIG. 8—Removing Output

Shaft Assembly
FIG. TO—Removing Reverse Idler

Gear Shaftprocarmanuals.com

06-03-06
Ford Design Four-Speed Transmission
06-03-06

BEARING

7C
SPEEDOMETER

DRIVE GEAR

172

OUTPUT

SHAFT

SEAL

SNAP RING 7Aon

SPEEDOMETER GEAR

DRIVE BALL

353351•S

BLOCKING RING

7107

FIRST AND SECOND

SPEED SYNCHRONIZER

7124

SECOND SPEED GEAR

7102

THIRD AND FOURTH

SPEED SYNCHRONIZER

•7124

SNAP RING - 7109

FIG.
7
7—Output Shaft Disassembled

and torque the retaining nuts to speci-

fication.

14.
Install the back-up light switch

on the control assembly.

15.
Slide the lower boot over the

shift control assembly and attach the

entire assembly to the extension hous-

ing with the three bolts.

16.
Install the two bolts securing

the gear shift lever to the control as-

sembly.

17.
Pull the top lip of the lower

boot over the edges of the floor pan

and secure the upper boot to the lower

boot and floor pan with the four re-

taining screws.

18.
Position the shift rods in the se-

lector levers and install the retainers.

19.
Adjust the shift linkage as out-

lined previously in this section.

20.
Check the operation of the shift
mechanism for smooth

Adjust as required.
cross-over.

INPUT SHAFT BEARING

1.
Remove the snap ring that se-

cures the bearing to the shaft (Fig.

14).

2.
Press the input shaft gear out of

the bearing as shown in Fig. 15.

3.
Press a new bearing onto the

input shaft with the tool shown in Fig.

15.

4.
Secure the bearing with a snap

ring.

SYNCHRONIZERS

1.
Push the synchronizer hub from

each synchronizer sleeve (Fig. 16).

2.
Separate the inserts and insert

springs from the hubs. Do not mix the

parts of the first and second-speed
C1529-C

synchronizer with the third and

fourth-speed synchronizer.

3.
Position the hub in the sleeve,

making sure that the alignment marks

are properly indexed.

4.
Place the three inserts into place

on the hub. Install the insert springs

making sure that the irregular surface

(hump) is seated in one of the inserts.

Do not stagger the springs.

COUNTERSHAFT GEAR

BEARINGS

1.
Remove the dummy
sKo.ft,
two

bearing retainer washers, and the 21

roller bearings (Fig. 17) from each

end of the countershaft gear.

2.
Coat the bore in each end of the

countershaft gear with grease.

3.
Hold the dummy shaft in the

gear and install the 21 roller bearingsprocarmanuals.com

06-03-09
Ford Design Four-Speed Transmission

06-03-09

24.
Place a detent plug (Fig. 5) in

the detent bore. Place the reverse shift

rail into neutral position.

25.
Coat the third and fourth-

speed shift rail interlock pin with

grease and position it in the shift rail.

26.
Align the third and fourth-

speed shift fork with the shift rail

bores and slide the shift rail into place

making sure that the three detents are

facing toward the outside of the case.

Place the front synchronizer into

third-speed position and install the set

screw in the third and fourth-speed

shift fork. Move the synchronizer to

the neutral position. Install the third

and fourth-speed shift rail detent plug,

spring and bolt in the left side of the

transmission case (Fig. 5). Place the

interlock plug (tapered ends) in the

detent case.

27.
Align the first and second-

speed shift fork with the case bores

and slide the shift rail into place. Se-

cure the fork with the set screw.

28.
Coat the input gear bore with a

thin film of grease, then install the 15

roller bearings in the bore. A thick

film of grease could plug the lubricant

holes and restrict lubrication of the

bearings.

29.
Position the front blocking ring

in the third and fourth-speed synchro-

nizer.

Place the input shaft gear in the

transmission case making sure that

the output shaft pilot enters the roller

bearings in the input gear.

30.
Place a new gasket on the input

shaft bearing retainer. Dip the attach-

ing bolts in sealer and install and

tighten them to specifications.

31.
Install the output shaft bearing

as shown in Fig. 21. Install the snap

ring to retain the bearing.

32.
On some transmissions, position

the speedometer gear iometer drive

gear retaining clip on the output shaft

with the lower tang in the retaining

hole.
Align the groove in the gear with

the clip and slide the gear forward

until the upper tang on the clip locks

the gear (Fig. 4).

33.
Place the transmission in a ver-

tical position as shown in Fig. 22.

Align the countershaft gear bore and

thrust washers with the bore in the

case.
Install the countershaft.

34.
Use a new gasket and secure

the extension housing to the case with

the attaching screws. Use a sealer on

the extension housing attaching

screws. Torque the screws to specifica-

tions.

35.
Install the filler plug and drain

plug (if so equipped) in the case if

they were removed. Make sure that
COUNTIERSHAFT

7111

RETAINER WASHER

378559 • S

THRUST WASHER -7119

THRUST

WASHER

7119
ROLLER BEARINGS- 7121(21)

COUNTERSHAFT GEAR - 7113

ROLLER BEARINGS'7121(21)

RETAINER

WASHER

378559 • S

FIG. 17—Countershaft Gear Disassembled
C2081-A

REVERSE IDLER

GEAR SHAFT

7140

ROLLER BEARINGS

7D271 22)

THRUST WASHER

7149

RETAINER

WASHER

351529 - S

REVERSE IDLER GEAR -7142

'REVERSE SLIDING GEAR • 7D223

•THRUST WASHER • 7149

FIG. 78—Reverse Idler Gear Disassembled
C2082-A

the magnetic plug (if so equipped) is

installed in the bottom of the case.

36.
Pour the specified lubricant

over the entire gear train while rotat-

ing the input shaft.

37.
Place each shift fork in all posi-

tions to make sure that they operate

properly.

38.
Install the remaining detent

plug in the case. Install the long

spring (which is retained by the case)
to secure the detent plug.

39.
Use a new cover gasket and in-

stall the cover. Coat the cover attach-

ing screws with sealer and install and

tighten them to specifications.

40.
Coat the third- and fourth-

speed shift rail plug bore with a sealer

and install a new expansion plug.

41.
If the extension housing bush-

ing and seal are to be replaced, refer

to Section 1.procarmanuals.com

06-04-02

Specifications

06-04-02

TORQUE LIMITS(FT-LBS)

Extension Housing Bolts

Input Shaft Bearing Retainer-to-Transmission Case Bolts

Speedometer Cable Retainer-to-Transmission Extension

Transmission-to-Flywheel Housing Bolts

Gearshift Control Levers to Cam and Shaft Assembly Lock Nuts

Transmission Cover Bolts

Filler Plug-to-Case

Drain Plug-to-Case

Shift Fork-to-Shift Rail

Third and Fourth Shift Rail Detent Bolt

Gear Shift Control Assembly
to
Transmission Extension

Shift Selector Levers to Shift Rods

Gear Shift Control Support Bracket
to
Back Plate
3-Speed

Transmissions

42-50

30-36

3.0-4.5

37-42

18-23

14-19

10-20

20-30

10-18

-

8-12

10-20

-
4-Speed

Transmissions

42-50

19-25

3.0-4.5

37-42

18-23

14-19

10-20

20-30

10-18

10-18

8-12

10-20

8-13
® Inch-pounds

SPECIAL TOOLS
SPECIAL TOOLS (Continued)

Tool Numbers

T50T-100A

T59L-100B

Tool-1175AB

T53T-4621-Bor(4621-F)

T57L-4220-A4

T52L-7000-GAE

T63P-7025-A

T64P-7025-B

T53T-4621-C
Description

Impact Hammer-Long

Impact Hammer-Short

Grease Seal Remover

Drive Pinion Bearing Cone

Replacer Front
&
Rear

Differential Side Bearing Cone

Replacer
or
Input Shaft Bearing

Remover

Extension Housing Bushing and

Seal Remover

Output Shaft Bearing Remover

& Replacer

Output Shaft Bearing Remover

& Replacer

Drive Pinion Bearing

Cone Replacer
Tool Numbers

Tool-7025-B

Tool-7025-G

T64P-7111-A

T63P-7111-A

T64P-7140-A

T61L-7657-A

T57P-7697-B

T57P-7657-G

T67P-7341-A
Description

Rear Main Shaft Bearing Removei

Main Shaft Bearing Remover

& Replacer

Cluster Gear Roller Retainer Shaf

Cluster Gear Roller Retainer Shaft

Reverse Idler Shaft Remover

Transmission Extension Housing

Oil Seal Replacer

Extension Housing

Bushing Replacer

Extension Housing

Bushing Replacer

Shift Linkage Grommet

Replacerprocarmanuals.com

07-01-04
General Transmission Service

07-01-04

taching bolts to the proper torque. If

necessary, replace the gasket.

Check the fluid filler tube connec-

tion at the transmission case or pan.

If leakage is found here, install a new

O-ring or tighten the fitting to the

specified torque.

Check the fluid lines and fittings

between the transmission and the

cooler in the radiator tank for loose-

ness,
wear, or damage. If leakage can-

not be stopped by tightening a fitting,

replace the damaged parts.

Check the engine coolant in the ra-

diator. If transmission fluid is present

in the coolant, the cooler in the radia-

tor is probably leaking.

The cooler can be further checked

for leaks by disconnecting the lines

from the cooler fittings and applying

50-75 psi air pressure to the fittings.

Remove the radiator cap to relieve the

pressure build at the exterior of the oil

cooler tank. If the cooler is leaking

and will not hold this pressure the

cooler must be replaced. Cooler re-

placement is described in the Cooling

System Section of Group 11.

If leakage is found at either the

downshift control lever shaft or the

manual lever shaft, replace either or

both seals.

Inspect the pipe plug on the left

side of the transmission case at the

front. If the plug shows leakage, tor-

que the plug to specifications. If tight-

ening does not stop the leaks, replace

the plug. On a C6 transmission, a TV

pressure plug is also provided on the

right rear side of the case.

When converter drain plugs leak,

remove drain plugs with a six-point

wrench. Coat the threads with FoMo-

Co Perfect Seal Sealing Compound or

its equivalent, and install the plugs.

Torque the drain plugs to specifica-

tion. Fluid leakage from the converter

housing may be caused by engine oil

leaking past the rear main bearing or

from oil gallery plugs, or power steer-

ing oil leakage from steering system.

Be sure to determine the exact cause

of the leak before repair procedures

are started.

Oil-soluble aniline or fluorescent dyes

premixed at the rate of 1/2 teaspoon

of dye powder to 1/2 pint of transmis-

sion fluid have proved helpful in locat-

ing the source of the fluid leakage.

Such dyes may be used to determine

whether an engine oil or transmission

fluid leak is present or if the fluid in

the oil cooler leaks into the engine

coolant system. A black light, how-

ever, must be used with the fluorescent

dye solution.
DISHED OR

FLAT WASHER

" O.D.,
a" STEEL PLATE

5/8"X \W,

DRILL TO SUIT
HEX. HEAD SCREW

3/8"-24 X Vl

HEX. NUT W—
24

WELD

TOGETHER

WING
NUT

>/2"_13
THREAD

CHAIN,
10"
LONG
RUBBER PLUG

1
Vi" DIA. X 2"

LONG Vl"

HOLE THRU

APPROXIMATELY

40 DUROMETER
FLAT WASHER

Vs" O.D.

PLUG

VALVE
STANDARD BOLT

W-13
X 4Vl"

LONG SQUARE

THREAD
END

REMOVE HEAD

AND WELD
TO

WASHER

STANDARD 1/8" FITTING-87971-S FOR

RETAPPED DRAIN PLUG THREADS-USE

1/4" OVERSIZE FITTING-87973-S

D 1067-B
WELD TOGETHER

SECURELY—MUST

NOT LEAK

FIG. 2—Converter Leak Checking Tool

CONVERTER LEAKAGE

CHECK

If there are indications that the

welds on the torque converter are

leaking, the converter will have to be

removed and the following check

made before the unit is replaced.

A leak checking tool (Fig. 2) can be

made from standard parts. The tool

can be used to check all converters.

1.
Install the plug in the converter

(Fig. 3) and expand it by tightening

the wing nut. Attach the safety chains.

2.
Install the air valve in one of the

drain plug holes.

3.
Introduce air pressure into the

converter. Check the pressure with a

tire gauge and adjust it to 20 psi.

4.
Place the converter in a tank of

water. Observe the weld areas for

bubbles. If no bubbles are observed, it

may be assumed that the welds are

not leaking.

ENGINE IDLE SPEED CHECK

Check and, if necessary, adjust the

engine idle speed, using the procedure

given in Group 10.

If the idle speed is too low, the en-

gine will run roughly. An idle speed

that is too high will cause the vehicle

to creep, have harsh engagements and

harsh closed-throttle downshifts.
ANTI-STALL DASHPOT

CLEARANCE CHECK

After the engine idle speed has been

properly adjusted, check the anti-stall

dashpot clearance. Follow the proce-

dure given in Group 10 for checking

and adjusting this clearance.

MANUAL LINKAGE CHECKS

Correct manual linkage adjustment

is necessary to position the manual

valve for proper fluid pressure direc-

tion to the different transmission com-

ponents. Improperly adjusted manual

Tire Pressure Gauge

D1921-A

FIG. 3—Converter Leak Checking

Tool Installationprocarmanuals.com

07-01-09

General Transmission Service

07-01-09

For example, on a C4 transmission,

if the pressure at 10 inches of vacuum

was 120 psi and the pressure at 1.0

inch of vacuum was 170 psi, and up-

shifts and downshifts were harsh, a di-

aphragm adjustment to reduce the di-

aphragm assembly spring force would

be required.

If the pressure readings are low, an

adjustment to increase diaphragm

spring force is required.

To increase control pressure, turn

the adjusting screw in clockwise to re-

duce control pressure, back the adjust-

ing screw out by turning it counte-

rclockwise. One complete turn of the

adjusting screw (360 degrees) will

change idle line control pressure ap-

proximately 2-3 psi. After the adjust-

ment is made, install the vacuum line

and make all the pressure checks as

outlined in the Specification Section.

The diaphragm should not be ad-

justed to provide pressure below the

ranges shown in the Specification Sec-

tion in order to change shift feel. To

do so could result in soft or slipping

shift points and damage to the trans-

mission.

ALTITUDE

COMPENSATING TYPE

The altitude—compensating di-

aphragm is provided with an adjust-

ment screw located in the vacuum

connecting tube (Fig. 15). The adjus-

table feature allows control and TV

pressures to be adjusted (within limits)

to correct soft or harsh shift feel.

Control and TV pressures are in-

creased or decreased by turning the

adjusting screw.

Before replacing or adjusting the di-

aphragm, it must first be determined

that the pressure or vacuum is actual-

ly out of specification and that the

cause of the problem is not due to

other items within the transmission or

vacuum connecting lines.

If the tests outlined in the Specifi-
cation Section have been performed

and pressures are within specification

but shift feel is unsatisfactory, or if

the pressure is too high or too low at

10 inches of vacuum, the vacuum di-

aphragm may be adjusted to improve

the shift feel.

If shifts are excessively harsh, the

diaphragm should be adjusted to re-

duce control pressure by backing off

the adjusting screw (counterclock-

wise).
If shift quality is extremely soft,

control pressure should be increased

by turning the adjusting screw inward

(clockwise).

To adjust the vacuum diaphragm to

compensate for harsh shift quality,

first check control pressure in D, 2

and 1 at 10 inches manifold vacuum

and note the pressure reading ob-

tained. Remove the T-fitting from the

vacuum hose and back off the adjust-

ing screw (counterclockwise) by one

full turn. Each full turn will reduce

control pressure by approximately 2

1/2 psi at 10 inches of vacuum. Test

the vehicle for shift feel. If shift quali-

ty is still harsh, a further adjustment

should be made to reduce control

pressure. However, control pressure

should not be reduced below the speci-

fication shown for 10 inches of vacu-

um. If control pressure has been re-

duced to the low limit and shift feel is

still excessively harsh, the clutches and

band should be checked for correct

operation.

To adjust the vacuum diaphragm to

compensate for extremely soft shifts,

record the control pressure reading at

10 inches of vacuum in D, 2 and 1,

then make an initial adjustment of

one full turn inward (clockwise). Test

the vehicle for shift feel and again ad-

just the diaphragm, if necessary. Con-

trol pressure at 10 inches of vacuum

must not exceed the high limit shown

in the Specification Section.

When the necessary adjustments

have been completed and shift feel is

satisfactory, repeat all the tests out-

ADJUSTING

SCREW

PRIMARY

THROTTLE VALVE
DIAPHRAGM

SPRING

D 1639-A

FIG. 15—Altitude Compensating Type Vacuum Diaphragm
lined in the Specification Section. All

tests must be within specifications.

The adjustable vacuum unit must not

be used to allow for adjusting control

or TV pressures that are out of speci-

fications. If these pressures are found

to be out of specifications the cause

must be determined and corrected bef-

ore making any adjustment.

NEUTRAL START SWITCH

ADJUSTMENT AND

REPLACEMENT—COLUMN SHIFT

There are two types of column-

mounted neutral start switches: A and

B.
Type A switch has a parking brake

brake-release vacuum valve. Type B

switches do not have a vacuum valve.

The switches differ in appearance but

not in operation. Both switches are

actuated by a removable steel lever,

which is installed in the shifter tube

within the steering column assembly.

The following procedures outline the

steps necessary to correctly adjust and

replace the neutral start switch.

SWITCH ADJUSTMENT

Neutral Position

1.
With the selector lever held light-

ly against the neutral stop, attempt to

start the engine. If the engine starts

while holding the lever but does not

start when the lever is released, the

shift linkage should be adjusted. If the

engine does not start in either condi-

tion, adjust the switch.

2.
To adjust the switch in neutral,

place the transmission selector lever

against the stop of the neutral detent

position.

3.
Loosen the two retaining screws

that locate the switch on the steering

column (Fig. 16).

4.
With the selector lever against

the neutral stop, rotate the switch

until a start in the neutral position is

obtained. Then, tighten the switch at-

taching screws to 20 in-lbs torque.

5.
With the switch properly adjust-

ed in neutral, place the selector lever

in the 1 position and push the park

reset button (Fig. 16) to the left

(counterclockwise) until it stops. The

park reset must be performed when-

ever the switch has been adjusted.

Park Position

1.
Place the selector lever in the

park position, release the lever and at-

tempt to start. If the engine does not

start, reset the park adjustment.procarmanuals.com