torque CHEVROLET CAMARO 1967 1.G Chassis Owners Manual

CLUTCH AND TRANSMISSIONS 7-19

2.
With handle in full down position—adjust cable to ac-

quire dimension shown, be certain that cable is pulled

taut.

3.
Tighten set screw to 15-20 in. lbs.

4.
Bend excess wire and cut - be certain that wire does

not interfere with I.D. of lever or threads of shifter

knob.

NOTE: Handle must return freely from any

position.

SPEEDOMETER DRIVEN GEAR AND OIL SEAL

Replacement

Disconnect speedometer cable, remove retainer to

housing bolt and lock washer and remove retainer. In-

sert screw driver in slot in fitting and pry fitting, gear

and shaft from housing. Pry "O" ring in groove in fitting.

Install new "O" ring in groove and insert shaft Hold

the assembly so slot in fitting is toward boss on housing

and install in housing. Push fitting into housing until re-

tainer can be inserted in groove and install retainer lock

washer and bolt.
Fig.
5M - Installing Side Cover Assembly

TRANSMISSION SIDE COVER

Removal

1.
Disconnect control rods from levers.

2.
Shift transmission into second speed before removing

cover, by moving 1-2 (Rear Cover) shifter lever into

forward detent position.

3.
Remove cover assembly -from transmission case

carefully and allow oil to drain.

Disassembly (Fig. 4M)

1.
Remove the outer shifter lever nuts,*lock washers

and flat washers. Pull levers from shafts.

2.
Remove both shift forks from shifter shaft and detent

plate assemblies. Remove both shifter shaft assem-

blies from cover. Lip seals in side cover may now

be pryed out if replacement is required because of

damage.

1-2 DETENT CAM DETENT SPRING
3-4 DETENT CAM

1-2 SHIFTER SHAFT

1-2 SHIFT FORK
3-4 SHIFT

FORK

DETENT CAM \ 3-4 SHIFTER SHAFT

RETAINER RING

DETENT CAM PIVOT PIN
3.
Remove detent cam spring and pivot retainer "C"

ring. Remove both detent cams.

4.
Replace necessary parts.

Assembly (Fig. 4M)

1.
Install 1-2 detent cam to cover pivot pin first, then

install 3-4 detent cam so the detent spring notches

are offset or opposite each other. Detent cam

notches must be facing downward.

2.
Install detent cam retaining "C" ring to pivot shaft,

and hook spring into detent cam notches.

3.
Install both shifter shaft assemblies in cover being

careful not to damage lip seals. Install both shift

forks to detent plates, lifting up on detent cam to

allow forks to fully seat into position.

4.
Install outer shifter levers, flat washers, lock wash-

ers and nuts.

Installation (Fig. 5M)

1.
Shift 1-2 shifter lever into second speed (forward)

position. Position cover gasket on case.

2.
Carefully position side cover into place making sure

the shift forks are aligned with their respective

mainshaft clutch sliding sleeves.

3.
Install cover attaching bolts and tighten evenly to

15-20 ft. lbs. torque.

4.
Remove filler plug and add lubricant specified in

Section 0, to level of filler plug hole.

EXTENSION OIL SEAL

Replacement

1.
Remove propeller shaft.

2.
Pry out the extension oil seal.

3.
Prelubricate between sealing lips and press new oil

seal carefully into place in extension using J-5154 or

similar tool.

Fig.
4M - Transmission Side Cover/ Shift Fork and

Detent Assembly
CAUTION: Do not excessively force the seal

against the seat in the extension.

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH
AND
TRANSMISSIONS
7-20

COMPONENT PARTS REPLACEMENT

3.

4.

5.

6.
TRANSMISSION REPLACEMENT
(EXC.
CORVETTE)

Removal From Vehicle

1.
Remove shift lever trim plate and dust boot.

Remove shift lever assembly.

Raise vehicle
to
desired working height.

Disconnect
the
speedometer cable from speedometer

driven gear fitting.
.
~
. •

Remove propeller shaft, then support engine
at the

oil
pan
rail with
a
jack
or
other suitable support

capable
of
supporting
the
engine when transmission

is removed.

Disconnect shift lever bracket assembly from exten-

sion
and
remove
all 3
transmission shifter levers

from shifter shafts, (leave linkage connected
to

levers)
and
remove bracket assembly levers
and

linkage.

Remove extension mount7 to-crossmember attaching

bolts.

Loosen transmission crossmember
and
move rear-

ward
or
remove.

Remove
the
transmission-to-clutch housing retaining

bolts
and
install two guide pins, J-1126,
in
top holes.

Slide
the
transmission straight back until
the
input

shaft
is
free
of
splines
in the
clutch disc.

Slide
the
transmission rearward
to
allow sufficient

clearance
of
input shaft
and
clutch housing. Then tilt

input shaft
end of
transmission downward and with-
8.

9.

10.

11.
draw transmission from vehicle.

installation
to
Vehicle

1.
Raise transmission
and
rotate
as
necessary-to start

input shaft into clutch disc
and
slide transmission

forward until
it
bottoms against clutch housing.
Re-

move guide pins.

2.
Install
the
transmission-to-clutch housing retaining

bolts.
Torque
all
four retaining bolts
to 50 ft. lbs.

3.
Raise engine
and
position extension mount
to
cross-

member,
and
loosely install
the
retaining bolts.

Tighten crossmember
to
frame retaining bolts.

4.
Remove temporary support from engine, and torque

the extension mount retaining bolts.

5. Install propeller shaft.

6. Install control lever bracket assembly
to
transmis-

sion extension
and
connect shifter levers
to
shifter

shafts.

7. Fill transmission
to
level
of
filler plug hole with

correct lubricant specified
in
Section
0.

8. Lower vehicle and install shift lever assembly, check

shift pattern and adjust linkage
as
required.

9. Install trim plate and dust boot.

CORVETTE TRANSMISSION REPLACEMENT

Refer
to
similar procedure under 3-Speed Corvette

Transmission.

FOUR-SPEED (SAGINAW) TRANSMISSION

INDEX

Page

General Description
7-20

Maintenance
and
Adjustments
. . 7-21

Shift Linkage Adjustment.
. 7-21

Speedometer Driven Gear
and

Oil Seal ................
(See
Muncie 4-Speed)

Side Cover
7-22
Page

Removal
. . , 7-22

Disassembly
. . 7-22

Assembly
. . . 7-22

Installation
. 7-22

Extension
Oil
Seal
(See
Muncie 4-Speed)

Transmission Replacement (See Muncie 4-Speed)

GENERAL DESCRIPTION

The Saginaw four speed fully synchronized
(all
forward

gears) transmission incorporates helical drive gears

throughout.

The main drive gear
is
supported
by a
ball bearing
at

the front
end of the
transmission case and
is
piloted
at its

front
end in an oil
impregnated bushing mounted
in the

engine crankshaft.
The
front
end of the
mainshaft
is

piloted
in a row of
roller bearings
set
into
the
hollow
end

of
the
main drive gear
and the
rear end
is
carried
by a

ball bearing mounted
in the
front
of the
extension housing.

The countergear
is
carried
on a
single
row of
rollers

at both ends while thrust
is
taken on thrust washers
lo-

cated between
the
ends
of the
gear and
the
thrust bosses

in
the
case. Ah anti-rattle plate assembly
at the
front
of

the countergear provides
a
constant spring tension
be-

tween
the
counter
and
clutch gears
to
reduce torsional

vibrations.
The
sliding reverse idler gear
is
carried
on

a bushing finish bored
in
place.
It
rotates
on a
short

idler shaft retained by
a
woodruff
key.

The synchronizer assemblies consist
of a
clutch
hub,

clutch sleeve,
two
clutch
key
springs and three energizer

clutch keys
and are
retained
as an
assembly on
the
main

shaft
by a
snap ring.
A great deal
of
similarity
and
interchangeability
now

exists between
the new 3 and
4-speed Saginaw trans-

missions.

However,
the
synchronizer assembly
at the
front
of the

mainshaft
is
used
for the
third and fourth rather than
the

second
and
third shift.
The
synchronizer assembly
at

the rear
of the
mainshaft
is
used
for the
first and second

rather than
the
first
and
reverse shift. Gear teeth
cut

in
the
first and second synchronizer sleeve (reverse gear)

distinguish
it
from
the
third
and
fourth synchronizer

sleeve.

Starting from
the
front, gears
on the
mainshaft
are

third, second
and
first rather than second, first and
re-

verse.
A
fourth blocker ring
is
used between
the 1-2

synchronizer assembly
and
first gear
on the
four-speed

transmissions.

The cover
on the new
four-speed transmission
is lo-*

cated
on the
left-hand side
of the
case.
It is
similar
to

the three-speed cover with
the
addition
of a
reverse

shifter shaft assembly, detent ball
and
detent spring.

Disassembly
and
assembly procedures
are
covered
in

this section.

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-21

MAINTENANCE AND ADJUSTMENTS

SHIFT LINKAGE ADJUSTMENT

(CHEVROLET & CHEVELLE)

1.
Set Lever (L) (M) and (P) in neutral detent position.

2.
Move Lever Stud (A) to neutral detent position and

insert Locating Gauge (B) into Control Lever Bracket

Assembly.

3.
Install Reverse Rod (H) with retainer on Lever (T).

4.
Maintaining Lever (T) against Locating Gauge, Adjust

Clevis (R) at Lever (P) until Clevis Pin freely passes

through holes in Clevis (R) and Lever (P).

5.
Install Clevis Pin, Washer and Cotter Pin; tighten

Nut (S) against Clevis (R).

6. Install Rod (K) with retainer on Lever (C).

7.
Maintaining Lever (C) against Locating Gauge, adjust

Clevis (N) at Lever (M) until Clevis Pin freely

passes through holes in Clevis (N) and Lever (M).

8. Install Clevis Pin, Washer and Cotter Pin; tighten

Nut (O) against Clevis (N).

9. Install Rod (J) with retainer on Lever (L).

10.
With two Jam Nuts (G), (E) and Swivel (F) loose on

Rod (J) insert and attach Swivel (F) with retainer to

Lever (D).

11.
Maintaining Lever (D) against Locating Gauge (B)

while holding Swivel (F) run Jam Nut (G) against

Swivel (F) then tighten other Jam Nut (E) against

swivel.

12.
Remove Locating Gauge and check shifts to insure

proper operation, readjust if necessary.

SHIFT LINKAGE ADJUSTMENT (CHEVY II)

1.
Set Levers (H) (R) and (T) in neutral detent position.
2.
Move Lower Control Lever (A) to neutral detent po-

sition and insert Locating Gauge (B) into Control

Lever Bracket Assembly.

3.
Install Reverse Control Rod (G) with retainer on

Lever (X).

4.
Maintaining Lever (X) in neutral position with Locat-

ing Gauge (B), Adjust Clevis (V) at lever (T) until

Clevis Pin freely passes through hole in Clevis (V)

and Lever (T).

5.
Install Clevis Pin, Washer and Cotter Pin. Tighten

Jam Nut (W) to specified torque against Clevis.

6. Install Control Rod (F) with retainer on Lever (C).

7.
Maintaining Lever (C) in neutral position with Locat-

ing Gauge (B), Jam Nuts (M and S) and Swivel (N)

loose on Rod (F), attach to Lever (R) with retainer.

8. While holding Swivel (N) run Jam Nut (M) against

Swivel (N) and tighten Jam Nut (S) against Swivel (N).

9. Install Rod (E) with retainer on Lever (D).

10.
Maintaining Lever (D) in neutral position with Locat-

ing Gauge (B) and Jam Nut (J and L) and Swivel (K)

loose on Rod (E) attach to Lever (H) with retainer.

11.
While holding Swivel (K) run Jam Nut (J) against

Swivel (K) and tighten Jam Nut (L) against Swivel (K).

12.
Remove Locating Gauge (B) and shift to insure proper

operation. Readjust clevis and swivels if necessary.

SHIFT LINKAGE ADJUSTMENT

(CAMARO AND CORVETTE)

1.
Set Transmission Shift Levers in neutral position.

2.
Move Lever Arm (A) and Lever (C) (D) and (E) to

neutral position and insert Locating Gauge (B) into

Control Lever Bracket Assembly.

N

f E

Fig.
IX - Shift. Linkage (Chevrolet & Chevelle)

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-22

Fig.
2X - Shift Linkage (Chevy II)

3.
Install Reverse Rod (J) with Retainer on Lever (N).

4.
With two Jam Nuts and Swivel loose on Rod (J) insert

and attach Swivel with Retainer to Lever (E).

5. Maintaining Lever (E) against Locating Gauge (B)

while holding Swivel run front Jam Nut against Swivel

then tighten rear Jam Nut against Swivel to specified

torque.

6. Install Rod (O) with Retainer on Lever (M)o

7. With two Jam Nuts and Swivel loose on Rod (O) insert

and attach Swivel with Retainer to Lever (C).

8. Repeat Step 5 Maintaining Lever (C) against Locating

Gauge (B).

9. Install Rod (K) with Retainer on Lever (L).

10.
With two Jam Nuts and Swivel retain to Lever (D).

11.
Repeat Step 5 maintaining Lever (D) against Locating

Gauge (B).

12.
Remove Locating Gauge and check shift to insure

proper operation. Readjust if necessary.

N

<

^ ii

K
3 A
1-2 DETENT

CAM
PIVOT PIN

DETENT

SPRING
3-4 DETENT

CAM

3-4

SHIFT FORK

1-2 SHIFTER

SHAFT ASSY.

REVERSE

SHIFTER SHAFT

ASSY.

3-4 SHIFTER

SHAFT ASSY.

DETENT SPRING

RETAINER

& BALL (UNDERNEATH) 1-2 SHIFTER R,NG

FORK

Fig.
3X - Comoro and Corvette Shift Linkage
Fig.
4X - Transmission Side Cover/ Shift Fork and Detent Assembly

TRANSMISSION SIDE COVER

Removal

1.
Disconnect control rods from levers.

2.
Shift transmission into neutral detent positions be-

fore removing cover.

3.
Remove cover assembly from transmission case

carefully and allow to drain.

Disassembly (Fig. 4X)

1.
Remove the outer shifter levers.

2.
Remove both shift forks from shifter shaft assem-

blies.
Remove all three shifter shaft assemblies

from cover. "O" ring seals around shifter shaft

may now be pryed out if required because of damage.

Remove reverse shifter shaft detent ball and spring,

3.
Remove detent cam spring and pivot retainer "C"

ring. Mark to identify for reassembly, then remove

both detent cams.

4.
Replace damaged parts.

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH
AND
TRANSMISSIONS
7-23

Assembly (Fig.
4X)

1.
With detent spring tang projecting
up
over
the 3rd

and
4th
shifter shaft cover opening install
the
first

and second detent
cam
onto
the
detent
cam
pivot
pin.

With
the
detent spring tang projecting
up
over
the

first
and
second shifter shaft cover hole install
the

3rd
and 4th
detent
cam,

NOTE:
The 1-2
detent
cam has a
.090" greater

contour
on the
inside detent notch.

2.

3.
Install detent
cam
retaining
"C"
ring
to
pivot shaft,

and hook spring into detent
cam
notches.

Install
1-2 and 3-4
shifter shaft assemblies
in
cover

being careful
not to
damage seals. Install both shift

forks
to
shifter shaft assemblies, lifting
up on
detent
cam
to
allow forks
to
fully seat into position.

4.
Install reverse detent ball
and
spring
to
cover, then

install reverse shifter shaft assembly
to
cover.

5.
Install outer shifter levers, flat washers, lock wash-

ers
and
bolts.

Installation

1.
Shift shifter levers into neutral detent (center) posi-

tion. Position cover gasket
on
case.

2.
Carefully position side cover into place making sure

the shift forks
are
aligned with their respective

mainshaft clutch sliding sleeves.

Install cover attaching bolts
and
tighten evenly
to

specified torque.

Remove filler plug
and add
lubricant specified
in

Section
0, to
level
of
filler plug hole.
3.

4.

ALUMINUM POWERGLIDE

INDEX

Page

General
Description
7-23

Maintenance
and
Adjustments .............. 7—23

Oil
Level Check
7-23

Periodic
Oil
Change
7-24

Periodic
Low
Band Adjustment
7-24

Manual
Shift Linkage Check
and
Adjust
7-24

Floor
Shift Linkage
7-25

Floor
Mounted Control Lever
and

Bracket
Assembly
7-29

Throttle
Valve Linkage
.... 7-29

Neutral
Safety Switch
.. . 7-30

Throttle
Return Check Valve (Dashpot)
7-30

Component
Parts Replacement
7-30

Transmission
Replacement .............. 7—30
Page

Other
Service Operations
7-32

Diagnosis
7-32

Warming
Up
Transmission
7-32

Shop
Warm
Up , 7-32

Road
Warm
Up 7-32

Checking
Fluid Level
and
Condition
7-32

Manual
Linkage
7-32

Oil
Leaks
7-33

Basic
Pressure Checks
7-33

Wide
Open Throttle Upshift Pressure Check
.... 7-33

Idle
Pressure
in
Drive Range
7-33

Manual
"Low"
Range Pressure Check .......
7-33

Drive
Range Overrun (Coast) Pressure
.
.......
7-33

Powerglide
Shift Points
. . 7-35

GENERAL DESCRIPTION

The case
and
converter housing
of the two
speed alumi-

num Powerglide Transmission
is a
single case aluminum

unit. When
the
manual control
is
placed
in the
drive
po-

sition,
the
transmission automatically shifts
to low
gear

for initial vehicle movement.
As the car
gains speed
and

depending
on
load
and
throttle position,
an
automatic shift

is made
to
high gear.
A
forced downshift feature
pro-

vides
a
passing gear
by
returning
the
transmission
to low

range.

The
oil
pump assembly
is a
conventional gear type
and

the
oil
pump housing
is of the
large diameter type acting

as
the
front bulkhead
of the
transmission.
The
torque

converter
is a
conventional three element welded design

bolted
to the
engine flywheel which drives through
a
two-

speed planetary gearset.
The
high clutch assembly
is

typical
of the
designs used
in
this type transmission.
The

aluminum Powerglide uses
an
output shaft mounted
gov-
ernor which requires
a
hole through
the
output shaft.
The

reverse clutch assembly
is a
multiple disc type clutch.

The steel plates
are
splined directly
to the
case while
the

face plates
are
splined
to the
internal
or
ring gear.
The

clutch piston operates within
the
rear portion
of the
case.

The internal diameter
of the
pistoh
is
sealed to
an
integral

hub portion
of the
case rear bulkhead.
The
outside
dia-

meter
is
sealed
to a
machined portion
of the
case.
The

piston
is
hydraulically applied
and is
released
by
separate

coil springs.
The
valve body assembly
is
bolted
to the

bottom
of the
transmission case
and is
accessible
for

service
by
removing
the oil pan
assembly.
The
valve

body consists
of an
upper
and
lower body located
on
either

side
of a
transfer plate.
The
vacuum modulator
is lo-

cated
on the
left rear face
of the
transmission case.
The

modulator valve bore
is
located
in the
upper valve body.

MAINTENANCE
AND
ADJUSTMENTS

OIL LEVEL CHECK

The transmission
oil
level should
be
checked period-

ically
as
recommended
in
Section
0. Oil
should
be
added

only when level
is on or
below
the
"ADD" mark
on the dip

stick with
oil hot or at
operating temperature.
The oil

level
dip
stick
is
located
at the
right rear
of the
engine
compartment. Fill with
oil
specified
in
Section
0.

In order
to
check
oil
level accurately,
the
engine should

be idled with
the
transmission
oil hot and the
control

lever
in
neutral (N) position.

It
is
important that
the oil
level
be
maintained
no

higher than
the
"FULL" mark
on the
transmission
oil

level gauge.
DO NOT
OVERFILL,
for
when
the oil
level

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-24

is at the full mark on the dip stick, it is just slightly be-

low the planetary gear unit. If additional oil is added,

bringing the oil level above the full mark, the planetary

unit will run in the oil, foaming and aerating the oil. This

aerated oil carried through the various oil pressure pas-

sages (low servo, reverse servo, clutch apply, converter,

etc.) may cause malfunction of the transmission assem-

bly, resulting in cavitation noise in the converter and

improper band or clutch application. Overheating may

also occur.

If the transmission is found consistently low on oil, a

thorough inspection should be made to find and correct

all external oil leaks.

PERIODIC OIL CHANGE

The transmission oil should be changed periodically as

recommended in Section 0, and whenever transmission is

to be removed from the vehicle for repairs.

1.
Run engine for one minute in neutral prior to chang-

ing.

2.
Be sure vehicle is level or raise from the rear only.

3.
Remove the oil pan drain plug and allow oil to drain

thoroughly into a pan or can.

Replace drain plug and refill with approximately two

quarts of oil specified in Section 0.

NOTE: To refill the transmission, remove dip

stick from oil filler tube and refill transmission

with oil specified in Section 0 using filler tube

and funnel J-4264. Then, after shifting into all

ranges at idle speed to fill all oil passages, the

engine should be run at 800-1000 rpm with the

transmission in Neutral until the oil warms up,

then add oil as required to raise the fluid level

to the full mark on the dip stick. Refill capacity

is approximately 2 qts.
4.

Fig.
1PG - Adjusting Low Band Using J-21848
PERIODIC LOW BAND ADJUSTMENT (Fig. 1PG)

Low band adjustment should be periodically performed

at 12,000 mile intervals, or sooner, as necessary if op-

erating performance indicates low band slippage.

1.
Raise vehicle and place selector lever in neutral.

2.
Remove protective cap from transmission adjusting

screw.

3.
a. On Corvette Models: Drop left exhaust pipe for

clearance.

b.
On Chevelle Models: To gain clearance between

underbody and transmission, it may be necessary

to remove rear mount bolts from crossmember,

and move transmission slightly toward passenger

side of vehicle. .

4.
Loosen adjusting screw lock nut 1/4 turn and hold in

this position with wrench.

5.
Using Special Tool J-21848 adjust band to 70 in. lbs.

and back off four (4) complete turns for a band which

has been in operation for 6,000 miles or more,.or

three (3) turns for one in use less than 6,000 miles.

CAUTION: Be sure to hold the adjusting screw

lock nut at 1/4 turn loose with a wrench during"

the.adjusting procedure.

6. Tighten the adjusting screw lock nut to specified

torque.

CAUTION: The amount of back-off is not an

approximate figure, it must be exact.

MANUAL SHIFT LINKAGE CHECK & ADJUST

(Column Type)

1.
The shift tube and lever assembly must be free in the

mast jacket. See Section 9 for alignment of steering

column assembly if necessary.

2.
To check for proper shift linkage adjustment, lift

the transmission selector lever towards the steering

wheel. Allow the selector lever to be positioned in

drive (D) by the transmission detent.

NOTE: Do not use the indicator pointer as a

reference to position the selected lever. When

performing linkage adjustment, pointer is ad-

justed last.

3.
Release the selector lever. The lever should be in-

hibited from engaging low range unless the lever is

lifted.

4.
Lift the selector lever towards the steering wheel,

and allow the lever to be positioned in neutral (N) by

the transmission detent.

5.
Release the selector lever. The lever should now

be inhibited from engaging reverse range unless the

lever is lifted.

6. A properly adjusted linkage will prevent the selector

lever from moving beyond both the neutral detent, and

the drive detent unless the lever is lifted to pass

over the mechanical stop in the steering column.

7.
In the event that an adjustment is required, place

the selector lever in drive (D) position as determined

by the transmission detent. See Steps 2 and 3.

8. Loosen the adjustment swivel at the cross-shaft,

and rotate the transmission lever so that it contacts

the drive stop in the steering column.

9. Tighten the swivel and recheck the adjustment. See

2 and 6.

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-31

with the "white" stripe painted on the engine

side of the flywheel outer rim, denoting the

"heavy" side of the engine.

1.
Mount transmission on transmission lifting equip-

ment installed on jack or other lifting device.

2.
Remove converter holding tool.

CAUTION: Do not permit converter to move

forward after removal of holding tool.

3.
Raise transmission into place at rear of engine and

install transmission case to engine upper mounting

bolts,
then install remainder of the mounting*bolts.

Torque bolts to 35 ft. lbs.

4.
Remove support from beneath engine, then raise

rear of transmission to final position.

5. Through flywheel cover opening align as closely as

possible the "white" flywheel balance mark stripe

and the "blue" painted stripe on the end of converter

cover and housing. If scribed during removal, align

scribe marks on flywheel and converter cover. In-

stall converter to flywheel attaching bolts. Torque

bolts to 15-20 ft. lbs.

6. Install converter under pan.

7. Reinstall transmission support crossmember to

transmission and frame.

8. Remove transmission lift equipment.

9. Connect propeller shaft to transmissions.

10.
Connect manual and TV control lever rods to

transmission.

11.
Connect oil cooler lines (if so equipped), vacuum

Fig.
13PG - Converter Holding Tool
modulato:* line, and speedometer drive cable to

transmission.

12.
Refill transmission through filler tube, using Funnel

J-4264 and following the recommended procedure

provided earlier in this section.

13.
Check transmission for proper operation and for

leakage. Check and, if necessary, adjust linkage.

CORVETTE POWERGLIDE TRANSMISSION

Replacement

1.
Disconnect battery ground cable.

2.
Remove ball end from transmission shift control

lever.

3.
Raise front and rear of vehicle.

4.
Insert a block of wood between the top of the dif-

ferential carrier housing and the underbody (to

prevent upward travel of the carrier when the car-

rier front support is disconnected).

5. Disconnect the differential carrier front support

from its frame bracket, by removing the nut on the

underside of the biscuit mount.

6. Pry the carrier downward to relieve load while re-

moving the two center mounting bolts from the

carrier front support. (To pry carrier downward

insert crowfoot end of a pry bar**hrough the open-

ing in the carrier front support, hooking end of bar

over top of the center mounting bolt pad cast in the

underside of the carrier).

7. Pivot carrier support downward for access to prop

shaft "U"-joint.

8. Disconnect prop shaft front and then rear
"U"
bolts.

9. Disconnect parking brake cable from ball socket at

idler lever located near center of underbody.

10.
Remove prop shaft by moving shaft forward.

11.
Remove left bank exhaust pipe.

12.
Remove right bank exhaust pipe and heat riser.

13.
Disassemble the transmission mount, as follows:

a. Remove the two bolts that attach rear mount

cushion to the rear mount bracket.

b.
Support engine under oil pan and raise engine to

remove load from rear mount cushion.

CAUTION: To avoid damage to oil pan, a suit-

able wide base, heavy wood platform should be

placed between the jack pad and the oil pan.

c. Remove the three transmission mount bracket-

to-crossmember bolts, then remove mount

bracket.

d. Remove the two bolts from mount pad to trans-

mission case and remove rubber mount cushion

and exhaust pipe "yoke".

14.
Disconnect oil cooler lines at transmission and

swing lines clear.

15.
Remove connector underpan.

16.
Remove converter to flywheel attaching bolts.

17.
At transmission disconnect vacuum modulator line

and speedometer cable.

18.
Disconnect transmission shift linkage from trans-

mission gearshift control lever. Remove shift lever.

19.
At transmission, remove throttle valve linkage and

disconnect neutral safety switch linkage, also re-

move the gearshift control linkage.

20.
Remove neutral safety switch from transmission

control bracket.

CHEVROLET CHASSIS SERVICE

CLUTCH AND TRANSMISSIONS 7-32

21.
Remove transmission output shaft slip yoke and in-

sert a plastic shipping plug in end of extension to

prevent spillage of transmission fluid.

NOTE:
The yoke is removed to avoid tearing

the heat reflecting pad on the underbbdy, when

the transmission is being removed.

22.
Remove bright metal ignition shielding from dis-

tributor area.

23.
Remove the transmission dip stick and tube

assembly.

24.
Disconnect transmission vacuum modulator line at

distributor advance line tee.

25.
Position transmission hoist under transmission and

attach safety chain to transmission.

26.
Remove transmission converter housing-to-engine

attaching foolts and slide transmission rearward.
NOTE:
Observe converter when moving trans-

mission rearward. If converter does not move

with the transmission, pry it free of flywheel

before proceeding.

27.
Install converter retaining strap.

28.
Lower and remove transmission from vehicle by

tilting the front down and to the right while inter-

mittently lowering the transmission to facilitate its

• removal.

29.
Reinstall transmission assembly by performing the

above steps in reverse order.

Bolt Torques

Transmission Case to Flywheel

Housing Bolts 35 ft. lbs.

Converter to Flywheel Bolts. . , . . 35 ft. lbs.

OTHER SERVICE OPERATIONS

Although certain operations, such as oil pan or gasket

replacement, valve body, governor, filler pipe "O" ring,

speedometer drive gear, case extension "0" ring and

rear oil seal, vacuum modulator, and servo cover or

gasket service may be performed from underneath the
vehicle without removing the Powerglide; their service

procedure is covered in the Passenger Overhaul Manual

and is not repeated here. Refer to the- Powerglide Sec-

tion of the Passenger Overhaul Manual for all other

service operations not covered here.

DIAGNOSIS

Proper operation of the Powerglide transmission may

be affected by a number of factors, all of which must be

considered when trouble in the unit is diagnosed.

Proper trouble diagnosis can only be accomplished

when performed in a thorough step by step procedure.

The following procedure has been devised and tested and

is recommended for all trouble diagnosis complaints and

if the service man will follow this checking procedure,

accurate and dependable diagnosis may be accomplished.

This will result in a savings of time, not only to the

service man, but to the customer as well.

WARMING UP TRANSMISSION

Before attempting to check and/or correct any com-

plaints on the Powerglide transmission it is absolutely

essential that the oil level be checked and corrected if

necessary. An oil level which is either too high or too

low can be the cause of a number of abnormal conditions

from excessive noise to slippage in all ranges.

It must be remembered that cold oil will slow up the

action of the hydraulic controls in the transmission. For

this reason a trouble or oil leak diagnosis should not be

attempted until the transmission has been warmed up by

either of the following procedures:

Shop Warm Up

1.
Connect tachometer to engine.

2.
Set parking brake tight and start engine.

3.
Place selector light in
"D"
(drive) range.

4.
Adjust carburetor idle speed adjusting screw to run

engine at approximately 750 rpm and operate in this

manner for two minutes. At the end of two minutes

of operation, the transmission will be sufficiently

warmed up for diagnosis purposes.
NOTE:
At this point, readjust the engine idle

speed to 450-475 rpm in
"D"
range.

Road Warm Up

Drive the car approximately 5 miles with frequent

starts and stops.

NOTE:
At this point, make sure the engine idle

speed is set to 450-475 rpm in
"D"
range.

CHECKING FLUID LEVEL AND CONDITION

After transmission has been warmed up, check the

fluid level with the engine idling, parking brake set and

control lever in "N" (neutral). If the fluid level is low,

add fluid to bring level up to the full mark on gauge rod,

CAUTION: If fluid level is too high, fluid may

be aerated by the planet carrier. Aerated fluid

will cause turbulence in the converter which will

result in lost power, lower stall speed and lower

pressures in control circuits. Lower fluid level

to full mark, then shut off engine to allow air

bubbles to work out of fluid.

When checking oil level, aburned smell and discolora-

tion indicate burned clutches or bands and the transmis-

sion will have to be removed.

MANUAL LINKAGE

Manual linkage adjustment and the associated neutral

safety switch are important from a safety standpoint.

The neutral safety switch should be adjusted so that the

engine will start in the Park and Neutral positions only.

With the selector lever in the Park position, the park-

ing pawl should freely engage and prevent the vehicle

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-36

TURBO HYDRA-MATIC TRANSMISSION

INDEX

Page

General Description . . , . 7-36

Maintenance and Adjustments . 7-37

Transmission Fluid 7-37

Fluid Level Indicator 7-37

Shift Control Linkage Adjustment ........... 7-37

Neutral Safety Switch Adjustment 7-37

Draining and Refilling Transmission . . . 7-37

Pressure Regulator Valve 7-38

Control Valve Body . 7-39

Governor ..'.... 7-40

Modulator and Modulator Valve 7-40

Parking Linkage . . 7-40
Page

Rear Seal -. 7-40

Other Service Operations . . 7-40

Transmission Replacement 7-40

Turbo Hydra-Matic Diagnosis Procedure. ......... 7-41

Sequence . ; ; 7-41

Oil Level and Condition Check 7-41

Manual Linkage 7-41

Oil Leaks .' 7-41

Case Porosity - Repair ................ 7-42

Oil Pressure Check 7-42

Transmission Shift Points 7-42

Special Tools 7-43

GENERAL DESCRIPTION

The Turbo Hydra-Matic transmission is a fully auto-

matic unit consisting primarily of a 3-element hydraulic

torque converter and a compound planetary gear set.

Three multiple-disc clutches, one sprag unit, one roller

clutch and two bands provide the friction elements re-

quired to obtain the desired function of the compound

planetary gear set.

The torque converter couples the engine to the plane-

tary gears through oil and provides hydraulic torque

multiplication when required. The compound planetary

gear set produces three forward speeds and reverse.

The
3-
element torque converter consists of a pump or

driving member, a turbine or driven member, and a

stator assembly. The stator is mounted on a one-way

roller clutch which will allow the stator to turn clock-

wise but not counter-clockwise.

The torque converter housing is filled with oil and

is attached to the engine crankshaft by a flex plate and

always rotates at engine speed. The converter pump is

an integral part of the converter housing, therefore the

pump blades, rotating at engine speed, set the oil within

the converter into motion and direct it to the turbine,

causing the turbine to rotate.

As the oil passes through the turbine it is traveling in

such a direction that if it were not re-directed by the

stator it would hit the rear of the converter pump blades

and impede its pumping action. So at low turbine speeds,

the oil is re-directed by the stator to the converter pump

in such a manner that it actually assists the converter

pump to deliver power or multiply engine torque.

As turbine speed increases, the direction of the oil

leaving the turbine changes and flows against the rear

side of the stator vanes in a clockwise direction. Since

the stator is now impeding the smooth flow of oil, its

roller clutch releases and it revolves freely on its shaft.

Once the stator becomes inactive, there is no further

multiplication of engine torque within the converter. At

this point, the converter is merely acting as a fluid

coupling as both the converter pump and turbine are

being driven at approximately the same speed - or at a

one-to-one ratio.

A hydraulic system pressurized by a gear type pump

provides the working pressure required to operate the

friction elements and automatic controls.

External control connections to transmission are:
Manual Linkage

Engine Vacuum

12 Volt Electrical

Signal
To select the desired op-

erating range.

To operate a vacuum mod-

ulator unit.

To operate an electrical

detent solenoid.

A vacuum modulator is used to automatically sense

any change in the torque input to the transmission. The

vacuum, modulator transmits this signal to the pressure

regulator for line pressure control, to the 1-2 accumula-

tor valve, and to the shift valves so that all torque re-

quirements of the transmission are met and smooth

shifts are obtained at all throttle openings.

The detent solenoid is activated by an alectric switch

on the carburetor. When the throttle is fully opened, the

switch on the carburetor is closed, activating the detent

solenoid and. causing the transmission to downshift at

speeds below approximately 70 MPH.

The selector quadrant has six selector positions: P,R,

N,D,
L2,L1.

P.
*
- Park position positively locks the output shaft to

the transmission case by means of a locking pawl

to prevent the vehicle from rolling in either di-

rection. The engine may be started in Park

position.

R. - Reverse enables the vehicle to be operated in a

reverse direction.

N.
- Neutral position enables the engine to be started

and run without driving the vehicle.

D,
- Drive Range is used for all normal driving condi-

tions and maximum economy. Drive Range has

three gear ratios, from the starting ratio to

direct drive. Detent downshifts are available by

depressing the accelerator to the floor.

L2.
- L2 Range has the same starting ratio as Drive

Range, but prevents the transmission from shift-

ing above second speed to retain second speed

acceleration when extra performance is desired.

L2 Range can also be used for engine braking.

L2 Range can be selected at any vehicle speed,

and the transmission will shift to second gear and

remain in second until the vehicle speed or the

throttle are changed to obtain first gear operation

in the same manner as in D Range.

CHIVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-37

LI.
- LI Range can be selected at any vehicle speed,

and the transmission will shift to second gear

and remain in second until vehicle speed is re-

duced to approximately 40 MPH, .depending on

axle ratio. LI Range position prevents the trans-

mission from shifting out of first gear.
It is very important that any communication concerning

the Turbo Hydra-Matic always contain the transmission

serial number and that all transmission parts returned

to Chevrolet Motor Division always be tagged with the

transmission serial number.

MAINTENANCE AND ADJUSTMENTS

TRANSMISSION FLUID

Transmission fluid level should be checked with trans-

mission warm and selector lever in "P" Park position,

every time engine oil level is checked or as specified in

Section 0 when engine oil is changed.

CAUTION: Since the Turbo Hydra-Matic trans-

mission is very sensitive to oil level, special

precautions should be taken when checking the

oil level, to insure against an overfifE

Transmission fluid should be changed as specified in

Section 0.

FLUID LEVEL INDICATOR

The fluid level indicator is located in the filler pipe at

the right rear corner of the engine. To bring the fluid

level from the add mark to the full mark add 1 pint.

Fluid level should be to the full mark with transmission

at normal operating temperature. With cold fluid the

level should be at the add mark or slightly below.

SHIFT CONTROL LINKAGE ADJUSTMENT

Adjust linkage as shown below and in Figure 2.

1.
The shift tube and lever assembly must be free in the

mast jacket See Section 9 for alignment of steering

column assembly if necessary.

2.
To check for proper shift linkage adjustment, lift the

transmission selector lever towards the steering

wheel. Allow the selector lever to be positioned in

drive (D) by the transmission detent.

NOTE: Do not use the indicator pointer as a

reference to position the selector lever. When

performing linkage adjustment, pointer is ad-

justed last.

3.
Release the selector lever. The lever should be in-

hibited from engaging low range unless the lever is

lifted.

4.
Lift the selector lever towards the steering wheel,

and allow the lever to be positioned in neutral (N) by

the transmission detent.

5.
Release the selector lever. The lever should now be

inhibited from engaging reverse range unless the

lever is lifted.

6. A properly adjusted linkage will prevent the selector

lever from moving beyond both the neutral detent,

and the drive detent unless the lever is lifted to pass

over the mechanical stop in the steering column.

See schematic diagram.

7.
In the event that an adjustment is required, place the

selector lever in drive (D) position as determined by

the transmission detent. See Steps 2 and 3.

8. Loosen the adjustment swivel at the cross-shaft, and
rotate the transmission lever so that it contacts the

drive stop in the steering column.

9. Tighten the swivel and recheck the adjustment. See

Steps 2 and 6. -

l(h Readjust indicator needle if necessary to agree with

the transmission detent" positions. See Section 9.

11.
Readjust neutral safety switch if necessary to pro-

vide the correct relationship to the transmission de-

tent positions. See Section 12.

12.
When properly adjusted the following conditions must

be met by manual operation of the steering column

shift lever:

a. From reverse to drive position travel, the trans-

mission detent feel must be noted and related to

indicated position on dial.

b.
When in drive and reverse positions, pull lever

rearward (towards steering wheel) and then re-

lease. It must drop back into position with no

restrictions.

NEUTRAL SAFETY SWITCH ADJUSTMENT

The neutral safety switch must be adjusted so that the

car will start in the park or neutral position, but will not

start in the other positions. For replacement refer to

Section 12 of this Manual.

DRAINING AND REFILLING TRANSMISSION

Drain oil immediately after operation before it has had

an opportunity to cool.

To drain oil proceed as follows:

1.
Remove bottom pan attaching screws, pan, and gas-

ket.

2.
Remove oil strainer. Remove "O" ring seal from

pick-up pipe and discard.

3.
Discard strainer if dirty.

4.
Install new "O" ring seal on pick-up pipe and install

strainer and pipe assembly.

5.
Thoroughly clean bottom pan.

6.. Affix new gasket to bottom pan with petroleum jelly.

7.
Install bottom pan with attaching screws and torque

to specifications;

8. If only the pan has been removed, pour approximately

7-1/2 pints of fluid into the transmission. If the

valve body has also been removed use 9-1/2 pints.

After a complete overhaul approximately 19 pints

are required. Be sure container, spout, or funnel is

clean.

9. Start engine and let idle (carburetor off fast idle

step).
Place selector lever in P position and apply

hand brake.

10.
With transmission warm (approximately 150°F), add

fluid to bring level to full mark on indicator.

CAUTION: Do not overfill. Foaming will re-

sult.

CHEVROLET CHASSIS SERVICE MANUAL