
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 4-8
Fig.
14—Coil Spring Installation (Chevrolet)
supported on the jack. With the spring now com-
pressed to approximately curb height, positively
position the springs in the lower seats by torquing
the nut on the lower seat bolt (fig. 15).
Re-connect shock absorbers, torque rear attach-
ment of upper and lower control arms, and re-
connect the axle tie rod at proper torque.
With the rear of vehicle still supported by jack under
axle;
remove the nut from the lower seat bolt of one
Fig.
15—Installing Coil Spring to Lower Control Arm (Chevrolet)
Fig.
16—Coil Spring Installation (Chevelle)
rear spring, slide proper lock washer on the bolt
and reinstall the nut to proper torque. Similarly
install a lock washer at the lower seat of the other
rear spring.
5.
Install rear wheels and lower vehicle to floor.
Chevelle
Removal
The following procedure may be utilized to replace
either or both rear coil springs.
1.
Raise vehicle to a height that will allow axle assem-
bly to hang freely, and position supports under both
frame side rails.
2.
Support axle assembly with an adjustable lifting
device, and disconnect shock absorber at axle
bracket. Shock absorber on side opposite need not
be disconnected if only one spring is being removed.
Refer to Shock Absorber Removal procedures out-
lined in this section.
3.
Lower axle assembly until suspension reaches end
of travel; then pry lower% pigtail over vertical re-
tainer on axle bracket and remove spring and insula-
tor from vehicle.
Installation
1.
Position rubber insulator on end of spring, making
sure that end of pigtail is butted against stop in
insulator. Install insulator and spring in upper
spring seat so that insulator is properly indexed
against stop (fig. 16).
2.
Pry lower pigtail portion of spring over vertical
flange of the axle bracket spring seat.
3.
Raise axle to allow shock absorber installation.
Position shock absorber in axle bracket. Torque nut
as outlined in Shock Absorber Installation
procedures.
4.
Lower vehicle and check rear riding height.
CHEVROLET CHASSIS SERVICE MANUAL

REAR SUSPENSION AND DRIVE LINE 4-12
Fig.
27—Shock Absorber Mounting—Exploded View (Chevy II)
Installation
1.
Loosely install the two shock absorber upper at-
taching bolts.
2.
Position lower attaching stud in axle bracket and
loosely install lock washer and nut.
3.
Torque upper attaching bolts to specifications.
4.
Torque lower attaching nut to specifications, ob-
serving procedure outlined in Removal procedure.
5.
If equipped with superlift shock absorbers, connect
air line to shock absorber and add air to obtain a
minimum of 10 psi.
6. Lower vehicle and check shock absorber action.
Fig.
28—Removing Shock Absorber Eye Bolt (Chevy II)
Chevy H
Removal (Refer to Fig. 27)
1.
Raise vehicle and support axle housing with adjust-
able jackstand.
2.
Loosen and remove shock absorber lower mounting
bolt from shock absorber eye (fig. 28).
3.
Remove shock absorber upper mounting bracket
bolts and withdraw shock absorber and bracket.
4.
Remove nut, washers, bushing and upper mounting
bracket from shock absorber. Inspect rubber bush-
ings for aging or damage and replace where
necessary.
Installation
1.
Assemble nut, washer, rubber bushings, bracket and
upper bushing to shock absorber. Torque nut to
specifications.
2.
Install shock absorber with upper bracket to floor
pan and torque to specifications.
3.
Insert shock absorber eye into lower bracket, install
bolt with nut to rear and torque to specifications.
4.
Lower vehicle and test shock absorber action.
Comoro
Removal (Refer to Fig. 29)
1.
Raise rear of vehicle and support rear axle
assembly.
2.
Loosen and remove shock absorber lower attaching
bolt from shock absorber eye.
3.
Remove shock absorber upper mounting bracket-to-
iiinderbody retaining screws and withdraw shock ab-
sorber and bracket.
4.
Remove nut, upper retainer and grommet, gasket
and bracket, and lower grommet and retainer from
the shock absorber rod.
5.
Inspect rubber grommets and gasket for damage and
deterioration--replace as required.
Installation
1.
Assemble lower retainer and grommet, bracket and
gasket, upper grommet and retainer and nut to the
shock absorber rod. Torque nut to specifications.
2.
Position shock absorber bracket to underbody and
install bracket retaining screws. Torque retaining
screws to specifications.
3.
Insert shock absorber eye into lower bracket, install
bolt with head toward front of vehicle. Torque nut to
specifications.
4.
Lower vehicle and test shock absorber action.
CONTROL ARM
Chevrolet Upper
Removal
1.
*
Using,a suitable hoist that will support the rear axle
housing or wheels (such as a twin post or drive on
ramp type), remove the rear pivot bushing bolt at
the rear axle housing (fig. 30).
NOTE: The rear axle must be supported in
such a way as to prevent the axle housing from
rotating about the lower control arm rear pivot,
and to also relieve load on the pivot bushing.
2.
Remove the three bolts, lock washers and nuts at-
taching the upper control arm bracket to the
CHEVROLET CHASSIS SERVICE MANUAL

REAR SUSPENSION AND DRIVE LINE 4-18
ig.
44—Rear Suspension Tie Rod Attaching Points (Chevrolet)
Bushing
Replacement
The following bushing removal procedure is effective
for both ends of the tie rod used on station wagons and
the left end of the tie rod used on all models except
station wagons.
1,
With tie rod bushing centered over Tool J-7877-2
and with tie rod supported horizontally, press or
drive bushing from rod, using Tools J-7877-1 and
J-7079-2 as shown in Figure 45.
2.
With tie rod centered over Tool J-7877-2 and rod
supported horizontally, press or drive bushing into
arm using Tools J-7877-3 and J-7079-2 as shown
in Figure 45. Tool J-7877-3 should bottom on tie
rod when bushing is fully installed.
fig.
45—Tie Rod Bushing Replacement (Chevrolet)
Installation
1.
Mount the tie rod to the axle bracket stud. Install
nut and special washer but do not tighten.
NOTE:
On the tie rod used on all models except
station wagons, place flanged portion of bushing
against attaching bracket.
2.
Install the bolt, lock washer and nut to the frame
bracket (fig. 44). Do not tighten.
NOTE:
Bolt may be installed from either
direction.
3.
Lower vehicle to floor (if raised) and bounce rear
end several times to settle bushings. Tighten af-
fected parts to specifications.
COMPONENT PARTS REPLACEMENT (CORVETTE)
WHEEL SPINDLE AND SUPPORT (Fig. 46)
Removal
Hemdve wheel drive spindle as outlined previously in
this section under "Wheel Bearing Adjustment".
Repairs
Out of 3/8" square steel bar stock, make bearing
removers and use as shown in Figure 47.
After removing deflector, spindle inner grease seal
and inner bearing race, bearing cups may be re-
moved while spindle support is still mounted to the
torque arm, by inserting remover tool and tapping
cup out. New bearing cups are installed using Tool
J-7817 cup installer and handle J-8092 (fig. 48).
To remove spindle support from torque arm, pro-
ceed as follows.
a. Disconnect parking brake cable from actuating
lever.
b.
Remove four nuts securing support to torque arm
and withdraw brake backing plate and position it
out of the way.
c. Disconnect shock absorber lower eye from strut
rod mounting shaft. It may be necessary to sup-
port spring outer end before disconnecting shock
absorber, as shock absorber has internal rebound
control.
d. Remove cotter pin and nut from strut rod mount-
ing shaft, then pull shaft from support and strut
rod.
e. Spindle support may then be removed and bearing
cups serviced as in Step 2 above.
4.
To remove drive spindle outer bearing and seal
proceed as follows.
a. Position Tool J-8331 between chamfered edge of
bearing seat and inner race of bearing (fig. 49).
Clamp Tool J-8331 in a vise and apply pressure
to unseat bearing.
CAUTION: Use extreme caution when position-
ing Tool J-8331 against machined surface of
spindle. Make sure all tool imperfections such
as nicks and burrs are removed from spindle
contact area before applying pressure to unseat
bearing.
b.
Position Tool J-8331 and spindle in an arbor
press and press bearing from spindle (fig. 50).
c. Remove outer seal and inspect for damage--re-
place if necessary. Outer seal must be placed on
spindle before outer bearing inner race and roller
CHEVROLET CHASSIS SERVICE MANUAL

REAR SUSPENSION
AND
DRIVE LINE
4-19
BRAKE BRAKE
DISC SHOE
OUTER
BEARII
-. -,
-«#*;>•
BRAKE
CAMPER
/
/ /
/ /
si—a
wC—
SPINDLE
^ SUPPOR1
BEARING
^ SPACER
INNER
" BEARING
DRIVE
" FLANGE
BEARING
-PRELOAD
SPACER
DEFLECTOR
CONTROL
ARM
Fig.
46-Wheel Spindle
and
Support Cross-Section (Corvette)
assembly is installed.
d. Pack outer bearing with a high-melting point
wheel bearing lubricant and position on spindle.
Large end of bearing should be toward shoulder
on spindle.
e. Press bearing on spindle using a bearing spacer
and Tool J-9436 as installers, as shown in Fig-
ure 50.
5. Pack spindle inner bearing with a high-melting point
-wheel bearing lubricant and position bearing in
spindle support - small end of bearing should be
positioned inward.
PRESS RAM
BEARING CUP
Fig.
48—Installing Spindle Bearing Cup (Corvette)
Fig.
49—Unseating Drive Spindle Outer Bearing (Corvette)
Fig.
47—Bearing Cup Removal (Corvette)
Fig.
50—Removing and Installing Drive Spindle
Outer Bearing (Corvette)
CHEVROLET CHASSIS SERVICE MANUAL

REAR SUSPENSION AND DRIVE LINE 4-20
Fig.
51—Shock Absorber Installation (Corvette)
6. Tap new spindle inner grease seal into seal bore
and install deflector over support inner end.
Installation
1.
Position support over torque arm bolts with strut
rod fork toward center of vehicle and downward.
Place backing plate over studs and torque nuts to
specifications.
2.
Connect parking brake cable to actuating lever.
3.
Install drive spindle assembly as outlined previously
in this section under "Wheel Bearing Adjustment".
4.
If new spindle support or associated parts are in-
stalled, determine correct shim size as follows.
a. Assemble spindle to support, using a .145" shim.
b.
Check bearing adjustment and correct as neces-
sary, following adjustment procedures previously
outlined.
DIFFERENTIAL CARRIER SUPPORT
BRACKET REPLACEMENT
1.
Place a 1/2" thick block of wood or steel between
nose of differential carrier and floor pan. This will
prevent carrier from twisting upward when support
bracket is disconnected.
2.
Remove carrier support-to-crossmember attaching
bolt.
3.
Remove nut from both of the bracket-to-carrier
through bolts.
4.
Slide bolts to one side until bolt head contacts floor
well. Mark the floor well at this point and drill a
3/4"
diameter hole for each bolt in floor well and
remove bolts.
5. Assemble carrier support bracket by reversing
above procedure. Torque all affected parts to
specifications.
6. Insert plastic plugs from the inside of the floor well
holes to prevent dust and water entry.
STRUT ROD SHAFT STRUT ROD
CAMBER CAM
AND BOLT
Fig.
52—Strut Rods (Corvette)
SHOCK ABSORBER (Fig. 51)
Removal
1.
Disconnect shock absorber upper mounting bolt*
2.
Remove lower mounting nut and lock washer.
3.
Slide shock upper eye out of frame bracket and pull
lower eye and rubber grommets off strut rod mount-
ing shaft.
4.
Inspect grommets and shock absorber upper eye for
excessive wear.
Installation
1.
Slide upper mounting eye into frame mounting
bracket and install bolt, lock washer and nut.
2.
Place rubber grommet, shock lower eye, inboard
grommet, washers and nut over strut rod shaft.
3.
Torque nuts to specifications.
STRUT ROD AND BRACKET (Fig. 52)
Removal
1.
Raise vehicle enough to provide working clearance.
2.
Disconnect shock absorber lower eye from strut
rod shaft.
3.
Remove strut rod shaft cotter pin and nut. With-
draw shaft by pulling toward front of vehicle (fig. 53).
4.
Mark relative position of camber adjusting cam and
Fig.
53-Removing Strut Rod Shaft (Corvette)
CHEVROLET CHASSIS SERVICE MANUAL

REAR SUSPENSION AND DRIVE LINE 4-21
Fig.
54—Marking Camber Cam and Bracket (Corvette)
bracket, so they may be reassembled in same loca-
tion (fig. 54).
5.
Loosen camber bolt and nut. Remove four bolts se-
curing strut rod bracket to carrier and lower
bracket.
6. Remove cam bolt nut and cam and bolt assembly.
Pull strut down out of bracket and remove bushing
caps.
7.
Inspect strut rod bushings for wear and replace
where necessary. Replace strut rod if it is bent or
damaged in any way.
Repairs
1.
With strut rod bushing centered over Tool J-7877-2
and with strut rod supported horizontally, press or
drive bushing from rod, using Tools J-7877-i and
J-7079-2 as shown in Figure 55.
2.
With strut rod end centered over Tool J-7877-2 and
rod supported horizontally, press or drive bushing
into arm using Tools J-7877-3 and J-7079-2 as
shown in Figure 55. Tool J-7877-3 should bottom
on strut rod when bushing is fully installed.
Installation
1.
Place bushing caps over inboard bushing and slide
rod into bracket. Install cam and bolt assembly and
adjust cam to line up with mark on bracket. Tighten
nut but do not torque at this point.
SPRING
LINK BOLT
SPRING
CUSHION
SPRING
CUSHION
CENTER
CLAMP
PLATE
J-7877-3
J-7877-1
STRUT ROD 11 s* ^#3 STRUT ROD
BUSHING
Fig.
56—Spring Mounting (Corvette)
2.
Raise bracket and assemble to carrier lower mount-
ing surface. Torque bolts to specifications.
3.
Raise outboard end of strut rod into spindle support
fork and insert strut rod shaft into fork so that flat
on shaft lines up with corresponding flat in spindle
fork. Install retaining nut, but do not torque.
4.
Place shock absorber lower eye and bushing over
strut shaft, install washer and nut and torque to
specifications.
5.
Lower vehicle to floor and torque camber cam nut
and strut rod shaft nut to specifications. Then in-
stall cotter pin through rod bolt.
6. Check rear wheel camber and adjust where
necessary.
SPRING (Fig. 56)
Removal
1.
Raise rear of vehicle and support on frame slightly
forward of torque control arm pivot points. Remove
wheels and tires.
Fig.
55—Strut Rod Bushing Replacement
Fig.
57—Chain Installation (Corvette)
CHEVROLET CHASSIS SERVICE MANUAL