FRONT SUSPENSION 3-16
available the following procedure may also be
used (fig. 22-Alternate Method).
1.
Support car on suitable hoist or jack (so control
arms may swing free) and remove the wheel and
tire assembly, shock absorber, and stabilizer link
at control arm.
2.
Place suitable jack stand under the lower control
arm cross shaft.
3.
Follow Steps 2-5 as outlined on previous page.
4.
Turn head of tool screw to partially compress
spring.
5. Remove the three control arm cross shaft attaching
bolts,
washers and nuts.
6. Carefully lower jack stand and if necessary increase
compression on spring and when coil spring is out of
its upper seat, relax tension on spring (fig. 22).
7. By using a pry bar to assist, if necessary, remove
the coil spring from the lower control arm.
8. Installation is the reverse of the above procedure.
Carefully follow instructions for installing spring
tool.
LOWER CONTROL ARM SPHERICAL JOINT
Chevrolet, Chevelle, Comoro and Corvette
Inspection
The lower control arm spherical joint should be re-
placed whenever wear is indicated in the upper joint
inspection.
NOTE: The lower control arm spherical joint
is a loose fit in the assembly when not connected
to the steering knuckle.
Only if inspection of each upper joint indicates them
both to be within limits, inspect each lower joint for ex-
cessive wear as follows:
1.
After reconnecting upper joints to steering knuckles,
support vehicle weight on wheels or wheel hubs.
2.
With outside micrometer or caliper, measure dis-
tance from top of lubrication fitting to bottom of ball
stud, and record the dimensions for each side.
3.
Then support vehicle weight at outer end of each
lower control arm, so that wheels or wheel hubs are
free,
then repeat Step 2.
4.
If the difference in dimensions on either side is
greater than 1/16" (.0625"), the joint is excessively
worn and both lower joints should be replaced.
If inspection of lower spherical joints does not indicate
excessive wear, inspect further as follows:
5.
On Chevrolet Only--Examine lubrication hole in each
joint assembly after cleaning out hole. Look for evi-
dence of the liner partially or fully blocking lubrica-
tion opening. Such evidence indicates that liner is
disintegrating and that both lower spherical joints
should be replaced.
Another indication of lower spherical joint excessive
wear is indicated when difficulty is experienced when
lubricating the joint. If the liner has worn to the point
where the lubrication grooves in the liner have worn
away, then abnormal pressure is required to force lubri-
cant through the joint. This is another reason to recom-
mend replacement of both lower joints.
If the above inspections do not indicate any reason for
spherical joint replacements, test the torque tightness of
Fig. 27 - Removing Lower Ball Joint - Chevelle
&
Camaro
the lower ball stud in the knuckle on each side as follows:
1.
Wire-brush off nut and cotter pin attaching spherical
joint ball stud to steering knuckle and examine for
evidence of looseness of stud in knuckle.
2.
If no evidence of looseness, remove cotter pin and
with prick punch or equivalent, mark nut stud and
knuckle to identify relative location.
3.
Tighten nut as installed and observe torque reading.
If less than 45 lbs. ft., stud may have been loose in
steering knuckle and replacement of both lower
spherical joints may be recommended.
4.
Check to see if torque of 60-94 lbs. ft. can be ob-
tained without bottoming stud or ball joint against
knuckle. If bottoming occurs, replace ball joint or
steering knuckle.
Chevrolet and Corvette
Removal
1.
Support lower control arm at outer end on floor jack,
with hoist or jack pad clear of lower ball stud nut.
2.
Remove upper and lower ball stud nuts, free ball
studs from steering knuckle and wire knuckle and
brake drum assembly up to fender skirt to preclude
interference while performing next step.
3.
Being careful not to enlarge the holes in control arm,
cut off rivets.
Installation
1.
Install new joint against underside of control arm and
CHEVROLET CHASSIS SERVICE MANUAL
FRONT SUSPENSION 3-17
4.
Replace the wheel and tire.
5.
Lower the vehicle.
Chevy II
inspection
Fig.
28 - Installing Lower Ball Joint - Chevelle & Camaro
retain in place with special bolts and nuts supplied
with new joint.
CAUTION: Use only alloy bolts supplied for
this operation. The special thick headed bolt
must be installed in the forward side of the
control arm.
2.
Tighten bolts and nut on ball stud to Specification
shown at the end of this book.
3.
Lubricate the joint.
Chevelle and Camaro
Removal
1.
Support lower control arm at outer end of floor jack,
with hoist or jack pad clear of lower ball stud and
remove the wheel.
2.
Remove the upper and lower ball stud nuts, free the
ball studs from the steering knuckle and wire the
knuckle and brake drum assembly out of the way to
preclude interference while completing the lower ball
stud removal procedure.
3.
Use a screw driver to pry off the seal and retainer.
Install Tools J-9519-10, J-9519-17 and J-9519-7 as
shown in Figure 27 and turn down on the hex head
screw until the ball stud is pushed out.
Installation
1.
Start the replacement ball stud into the control arm
and install Tools J-9519-10, J^9519-16 and J-9519-17
as shown in Figure 28.
2.
Turn down on the hex head screw until the ball stud
is seated properly in the control arm.
3.
Install the stud into the steering knuckle, secure in
place with the attacking nut and install the cotter pin.
1.
With upper control arm support in position as in
Figure 15, disconnect the lower ball stud from steer-
ing knuckle.
2.
Assemble nut to lower ball stud and check rotating
torque with torque wrench. Specifications for new
joints are 9 lbs. ft. If torque readings are exces-
sively high or low, replace ball joint.
Removal
1.
While vehicle weight is still on front wheels, position
support between upper control arm and frame side
rail (fig. 15).
2.
Raise vehicle and remove cotter pin and nut from
lower ball joint stud (fig. 29).
3.
Disconnect stabilizer at upper link. Break loose the
lower ball stud. Drop lower control arm until lower
ball joint is easily accessible.
, 4. Using a large chisel, cut off the three ball joint re-
taining plate rivet heads. It may be necessary to
drill out rivet heads before chiseling.
NOTE: Additional support to lower control
arm will be necessary to perform this operation.
5.
Remove ball joint from arm and clean arm.
6. Inspect ball joint seat and rivet holes for evidence of
fatigue such as cracking or bending. If defects are
evident, replace lower control arm as outlined later
in this section.
Installation
1.
Install ball joint in arm using special bolts furnished
with replacement kit.
NOTE: Use only special hardened bolts fur-
nished with this replacement kit. Do not attempt
to use other non-hardened bolts and do not at-
tempt to rivet replacement ball joint to arm.
Fig.
29- Disassembling Lower Ball Stud - Chevy
CHEVROLET CHASSIS SERVICE MANUAL
FRONT SUSPENSION 3-21
Chevy II
Removal
1.
Support control arm on Tool J-7 574-4 and insert
Spacer J-9514 (fig. 34).
2,
Press bushing out with Tool J-9226 and Handle
J-7079-2 (fig. 34).
Installation
With Spacer J-9514 still in control arm, invert control
arm and press in new bushing with Tool, J-7474-2 and
Handle J-7079-2 until bushing is fully seated.
CAUTION: It should be noted that control arm
bushing diameters are unequal and bushing must
be pressed into position through larger diameter
only.
CROSS SHAFT AND/ON BUSHINGS
Corvette
Removal
1.
Remove bolt, lock washer and collar from each end
of cross shaft.
2.
Thread a 7/16 x 20 capscrew (furnished with Tool
J-5888) to the bottom of the threads in one end of the
cross shaft.
3.
Support control arm in an arbor press on Tool
J-5888-3,
as shown in Figure 35.
NOTE:
Be certain bushing flange does not
contact support.
4.
Press on cap screw until bushing is free of control
arm. Discard bushing.
5. Remove cap screw from cross shaft. Insert it in
other end of shaft. Invert control arm on support.
Again be certain bushing flange does not contact
support.
6. Press on cap screw until bushing is free of control
arm. Discard bushing.
Installation
1.
With cross shaft in control arm and Tool J-7052-1
in position, place control arm on Tool J-5888-3.
Hand start bushing into control arm and over end of
cross shaft.
NOTE:
The end of the shaft with the two bolt
holes should be toward front of control arm.
2.
Install Tool J-7052-5 over bushing. Be certain
three-piece spacer is not over-lapping bushing holes
in control arm.
3.
Press bushing into control arm until flange contacts
control arm (fig. 36).
4.
Invert arm in press and repeat the process on the
other bushing. After installation, cross shaft should
be free enough to be rotated by hand.
5. Install collar, lock washer and cap screw in each end
of cross shaft. Tighten to torque shown in Specifica-
tions after spring installation.
UPPER CONTROL ARM SPHERICAL JOINT
Chevrolet, Chevelle, Comoro and Corvette
Inspection
The upper spherical joint is checked for wear by
checking the torque required to rotate the ball stud in the
assembly. After performing the first four steps under
"Replacement" below, install a stud nut on the stud and
measure the torque required to turn the stud in the as-
sembly with a torque wrench. Specified torque for a new
joint is 9 lbs. ft. If torque readings are excessively
high or low, replace the ball joint. If excessive wear is
indicated in upper joint, both upper and lower joints
should be replaced.
NOTE:
This inspection does not necessitate
upper control arm removal.
Replacement
1.
Support the vehicle weight at the outer end of the
lower control arm.
2.
Remove the wheel and tire assembly.
3.
Remove cotter pin and nut from upper control arm
ball stud.
4.
Remove the stud from knuckle.
5. Cut off the ball joint rivets with a chisel.
6. Install new joint and retain in place with the special
nuts and bolts supplied.
7. Reassemble ball stud to the steering knuckle.
Chevy II
Inspection
The following on-the-vehicle check is to determine ball
joint wear.
NOTE:
The upper ball joint is a loose fit when
not connected to the steering knuckle. Wear may
be checked without disassembling the ball stud
by
using'
the following procedure:
1.
While vehicle weight is still on front wheels, insert
upper control arm support as shown in Figure 14.
2.
Raise vehicle and allow wheel and tire to hang free.
3.
Measure distance from tip of ball stud to top surface
of control arm.
4.
Place adjustable jackstand under tire and raise
slightly to take up ball joint looseness.
5. Repeat Step 3 and if the difference in measurements
exceeds 3/32", the joint is excessively worn and
should be replaced.
Replacement
1.
With vehicle weight still on front wheels, install
spacer between upper control arm and frame side
rail (fig. 15). Raise vehicle.
2.
Remove wheel and tire.
3.
Disconnect stabilizer link (if present) and strut rod
at lower control arm.
4.
Remove cotter pin and nut from upper ball joint stud.
5. Break ball stud loose. Drop lower control arm,
steering knuckle and brake assembly with an adjust-
able jackstand until upper control arm ball joint is
easily accessible.
6. Using a large chisel, cut off the three ball joint re-
taining plate rivet heads. It may be necessary to
drill out rivet heads before chiseling.
CHEVROLET CHASSIS SERVICE MANUAL
REAR SUSPENSION AND DRIVE LINE 4-6
Fig.
10—Toe-in Adjusting Shim Location (Corvette)
Toe-in
Wheel toe-in is adjusted by inserting shims of varying
thickness inside the frame side member on both sides
of the torque arm pivot bushing (fig. 10). Shims are
available in thicknesses of
1/64",
1/32",
1/8" and 1/4".
To adjust toe-in, remove torque arm pivot bolt; then
position torque arm to obtain specified toe-in. Shim gap
toward vehicle centerline between torque arm bushing
and frame side inner wall.
NOTE: Do not use thicker shim than necessary,
and do not use undue force when shimming inner
side of torque arm - to do so may cause toe
setting to change.
Shim outboard gap as necessary to obtain solid stack-
up between torque arm bushing and inner wall of frame
side member. After correct shim stack has been se-
lected, install pivot bolt and hardened washers (fig. 10) -
making sure that all shims are retained - torque nut to
specifications and install cotter pin. If specified torque
does not permit cotter pin insertion, tighten nut to next
flat.
WHEEL BEARING ADJUSTMENT (CORVETTE)
inspection
The tapered-roller spindle bearings should have end
play of .001" to
.008".
During inspection, check end
play and, when necessary, adjust as outlined in this
section.
1.
Raise rear of vehicle until wheels clear ground.
2.
Disengage bolt lock tabs and disconnect outboard end
of axle drive shaft from wheel spindle flange.
3.
Mark camber cam in relation to bracket. Loosen and
turn camber bolt until strut rod forces control arm
outward. Position loose end of axle drive shaft to
one side for access to spindle.
4.
Remove wheel and tire assembly. Mount dial in-
dicator (Tool J-8001) on torque arm or adjacent
surface and rest pointer on flange or spindle end
(fig. H).
5.
Grasp brake disc and move axially (in and out) while
reading movement on dial indicator. If end movement
is within the .001" to .008" limit, bearings do not
require adjustment. If not within .001" to .008"
limit, record reading for future reference and adjust
bearings as outlined below.
Adjustment
1.
Apply parking brake to prevent spindle from turning
and remove cotter pin and nut from spindle.
2.
Release parking brake and remove drive spindle
flange from splined end of spindle.
3.
Remove brake caliper and brake disc as outlined in
Section 5.
4.
Install Thread Protector J-21859-2 over spindle
threads; then remove drive spindle from spindle
support, using Tool J-22602 as shown in Figure 12.
CAUTION: When using Tool J-22601 to remove
drive spindle, make sure puller plate is posi-
Fig.
11—Checking Wheel Bearing Adjustment (Corvette)
Fig. 12—Removing Drive Spindle from Support (Corvette)
CHEVROLET CHASSIS SERVICE MANUAL
REAR SUSPENSION AND DRIVE LINE 4-7
tioned vertically in the torque arm before ap-
plying pressure to the puller screw.
5.
Remove shim and bearing spacer from spindle
support.
6. Note size of shim used. If dial indicator reading
was more than
.008",
select a shim thinner by the
amount needed to bring end play within limits. If
dial indicator reading was less than
.001",
select a
shim thicker by the amount needed to bring end play
within limits.
NOTE: Shims are available in thicknesses from
.097"
to .148" in increments of
.003".
EXAMPLE: Bearing end play reading obtained
on dial indicator was
.011",
.003" over limit.
Bearing shim removed from spindle measures
.145".
New shim installed measures .139", .006"
smaller. End play is now decreased by .006" and
is
.005",
which is within the .001" to .008" limit.
7.
After determining shim thickness, install bearing
spacer and shim on spindle. Position spindle in
spindle support.
8. Press inner bearing race and roller assembly on
spindle as follows.
a. Position Tool J-4731 over spindle and against
bearing inner race.
b.
Position washer and spindle nut on spindle and
proceed to tighten nut until bearing is forced on
spindle sufficiently to allow spindle drive flange
to be installed (fig. 13). Remove spindle nut,
washer and Tool
J-4731.
Discard nut and use a
new one for final assembly.
9. Position drive flange over spindle, making sure
flange is aligned with spindle splines. Install washer
Fig.
13—Installing Drive Spindle to Support (Corvette)
and nut on spindle then tighten nut to specifications
and install cotter pin. If specified torque does not
permit cotter pin insertion, tighten nut to next flat.
10.
Seat spindle support outer seal in bore by using
screw driver, or other suitable tool, to press against
metal portion of seal.
11.
Install brake disc and caliper. Refer to Section 5
for details of brake disc and caliper installation.
12.
Install axle drive shaft, wheel and tire assembly,
adjust camber cam to original position and torque
all components to specifications.
COMPONENT PARTS REPLACEMENT
(Chevrolet, Chevelle, Chevy II and Camaro)
COIL SPRING
Chevrolet
Removal
To remove either or both rear coil springs proceed
as follows.
1.
Raise rear of vehicle and place jack stands under
frame. Support vehicle weight at rear, using either
a jack or post of twin-post hoist under axle.
2.
Remove both rear wheels from vehicle.
3.
With the car supported as in Step 1, so that the rear
springs are compressed by weight of vehicle; per-
form the following:
a. Disconnect both rear shock absorbers from the
anchor pin lower attachment.
b.
Loosen the upper control arm(s) rear pivot bolt
(do not remove the nut).
C. Loosen both the left and the right lower control
arm rear attachment (do not disconnect from axle
brackets).
d. Remove the rear suspension tie rod from the
stud on the axle tube.
4.
At the lower seat of both rear coil springs, slightly
loosen the nut on the bolt that retains the spring and
seat to the control arm. When the nut has been
backed off the maximum permissible, all threads of
the nut should still be engaged on the bolt.
CAUTION: Under ,no condition should the nut,
at this time, be removed from the bolt in the
seat of either spring.
5.
Slowly lower the support (jack or hoist post) that has
been in place under the rear axle, thereby allowing
the axle to swing down, carrying the springs out of
their upper seat and providing access for spring
removal.
6. Remove the lower seat attaching parts from each
spring, then remove the springs from the vehicle
(fig. 14).
Installation
1.
Position the springs in their upper seat so that end
of top coil is 3/8" ± 1/8" from end of stop. Install
the lower seat parts on the control arm, with the nut
finger tight on the spring retainer bolt.
NOTE: Omit the lock washer under the special
high carbon bolt, so that sufficient bolt thread
will be available to start the nut. The lock
washers will be installed later (in Step 4).
2.
By alternately raising the axle slightly and then
re-snugging the nut on each spring lower seat bolt,
move the axle upward until vehicle weight is fully
CHEVROLET CHASSIS SERVICE MANUAL
REAR SUSPENSION AND DRIVE LINE 4-9
Fig.
17—Rear Spring—Exploded View (Chevy II)
LEAF SPRING, SPRING SEAT PADS, SPRING EYE
BUSHINGS Chevy II (Fig. 17)
Removal
1.
Raise vehicle and support rear axle assembly.
2.
Pull parking brake cable out of lower spring pad
mounting bracket clamp and disconnect cable above
axle housing. Remove four nuts securing lower
spring pad mounting bracket to axle spring seat
(fig. 18). Drop lower bracket and remove rubber
spring pad.
3.
Loosen and drive out front spring eye bolt. Lower
spring and remove front rubber eye bushing (fig. 19).
4.
Remove nuts from rear spring shackle (fig. 20),
spread shackle to separate it from spring eye and
support bracket and remove spring. Remove rear
spring eye bushings.
5.
Remove upper spring pad cushion.
Installation
1.
Inspect spring eye bushings and spring pads for ex-
cessive wear or aging and replace as necessary.
Inspect spring rear shackles, front spring bracket
and eye bolt for bending or cracking and correct
where needed.
2.
Assemble spring rear shackle as follows:
a. All except Station Wagons (fig. 21).
Fig.
19—Removing Front Eye Bushings (Chevy II)
3.
' Fig. 20—Disassembling Rear Spring Shackle (Chevy II)
1.
Insert inboard rubber spring eye bushings into
i'ear spring eye and outboard shackle bushings
into shackle mounting bracket.
2.
Position spring and install shackle to spring
and mounting bracket with top nut toward out-
board of vehicle and bottom nut toward vehicle
centerline.
3.
Tighten nuts but-do not torque at this point,
b.
Station Wagon (fig. 22):
When installing shackle as in Step 2 above, top
nut should be toward centerline of vehicle and
bottom nut toward outboard of vehicle.
Insert inboard rubber bushing into front spring eye.
Fig.
18—Removing Lower Pad Bracket (Chevy II)
Fig.
21—Rear Spring Shackle Exploded View-All
Except Station Wagon (Chevy II)
CHEVROLET CHASSIS SERVICE MANUAL
REAR SUSPENSION AND DRIVE LINE 4-11
lower cushion
correct.
will be aligned if installation is
Fig.
25—Installing Spring Front Bushing (Camaro)
Unnecessary torque applied after flange is
seated will tend to distort flange and reposition
bushing in spring.
i. Disassemble bushing installation tools and re-
move from spring.
8. Pry parking brake cable out of the retainer bracket
mounted on the spring mounting plate.
9. Remove spring bracket-to-axle bracket retaining
nuts,
remove upper and lower rubber spring pads
and bracket.
10.
Support spring, then remove lower bolt from spring
rear shackle. Separate shackle and withdraw spring
from vehicle.
11.
Remove rear spring shackle upper bolt and withdraw
shackle bushings from frame.
Installation
1.
Position spring front mounting bracket to spring
front eye. Spring attaching bolt must be installed
so that head of bolt is toward center of vehicle.
2.
Position spring shackle upper bushings in frame,
position shackles to bushings and loosely install
bolt and nut.
3.
Install bushing halves in spring rear eye, place
spring to shackles and loosely install shackle lower
bolt and nut.
NOTE: When installing spring, make sure
spring is positioned so that parking brake cable
is on underside of spring.
4.
Raise front end of spring and position bracket to
underbody. Guide spring into position so that it will
index in the axle bracket and also make sure that
the tab on spring bracket is indexed in slot pro-
vided in the underbody.
5.
Loosely install spring-to-underbody bracket.
6. Position spring upper cushion between spring and
axle bracket so that spring cushion ribs align with
axle bracket locating ribs.
7.
Place lower spring cushion on spring so that .cushion
is indexed on locating dowel. Upper cushion and
8. Place lower mounting plate over locating dowel on
spring lower pad and loosely install retaining nuts.
9. If new mounting plate was installed, transfer parking
brake cable retaining bracket to new plate.
10.
Position shock absorber to spring mounting plate and
loosely install eye bolt and nut - head of bolt should
be toward front of vehicle.
11.
Position parking brake cable in retaining bracket and
securely clamp bracket to retain cable.
12.
Remove stand jacks and lower vehicle so that weight
of vehicle rests on suspension components. Torque
all affected parts to specifications.
SHOCK ABSORBER
Chevrolet and Chevelle
Removal
1.
Raise rear of vehicle and support rear axle
assembly.
If equipped with superlift shock absorber, disconnect
air line from shock absorber.
Disconnect shock absorber at upper mounting bracket
by removing the two retaining bolts. Refer to Figure
26 for shock absorber mounting details. (Chevelle
components shown as typical.)
Disconnect shock absorber at lower attaching bracket
and remove shock.
NOTE: When performing any service opera-
tions that requires removal or loosening of the
lower attaching nut, it is essential that the stud
be prevented from turning. A hex is located on
the stud between the axle bracket and shock
absorber in order that a wrench may be used
for this purpose. Failure to hold the stud in
this manner will result in damage to the mer
chanical bond between the shock absorber bush-
ing and the mounting stud.
2.
3.
STATION WAGON AND PICKUP
Fig.
26—Shock Absorber Mounting—Exploded View
(Chevelle)
CHEVROLET CHASSIS SERVICE MANUAL
REAR SUSPENSION AND DRIVE LINE 4-14
Fig.
32—Upper Control Arm Bushing Installation (Chevrolet)
Installation
1.
Position rear of control arm into axle bracket and
loosely install the pivot bolt.
2.
Align the forward end of the control arm with the
rear crossmember and install front bracket bolts
through holes. Raise or lower nose of carrier as
/ required to help align bracket and crossmember.
3.
Install crossmember reinforcement plate, lock
washers and nuts to retain bracket in place.
4.
Position vehicle so that weight is on suspension
components and torque all affected parts to
specifications.
Chevrolet Lower
Removal
1.
Raise vehicle and remove shock absorber and spring
as outlined in this section.
NOTE:
If both rear suspension lower control
arms are to be removed, support the rear axle
in such a manner to prevent damage to brake
lines and to prevent assembly from falling.
2.
Note position of control arm in forward attaching
bracket and disconnect control arm at forward and
rearward attaching points. Remove assembly from
vehicle.
Bushing Replacement
Lower control arm front and rear bushing assemblies
are not interchangeable and require separate removal
and installation procedures.
1.
Replace the front bushing as follows.
a. Center Receiver J-7574-4 over flanged end of
bushing and position Spacer J-7574-3 over bush-
ing and between sides of control arm. Using
Remover J- 7574-1 against small end of bushing,
press bushing from control arm. Refer to Figure
33 for installed view of tools.
b.
Position bushing in control arm making sure of
correct installation. Small end of bushing will
pass through one side without any interference.
c. Position Puller Screw J-21058-15 through In-
staller Adapter J-7574-2--head of puller screw
should rest against flat side of adapter.
d. Install adapter and screw through bushing with
adapter resting against flange portion of bushing.
Install Receiver J-21058-6 and Bridge J^-21058-7
on opposite side of control arm (fig. 34).
e. Install thrust bearing and Nut J-21058-8. Screw
nut against J-21058-7 to maintain proper relation-
Fig.
33—Lower Control Arm Front Bushing Removal (Chevrolet)
Fig. 34—Lower Control Arm Front Bushing Installation
(Chevrolet)
CHEVROLET CHASSIS SERVICE MANUAL