Chevrolet 10 Series 1968, Service Manual

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REAR SUSPENSION AND DRIVE LINE 4-6
4. Support control arm just as in removing bushing,
center new bushing flanged side up over control arm
hole.
5. Place Tool J-8448-1 on top of bushing and, after
carefully seating bushing in tool, press bushing into
arm until flange contacts arm wall.
Installation
Refer to Figure 1 5
1. Position bushed end of control arm in pivot yoke be­
tween tunnel and frame, align holes with drift and
insert pivot bolt. Place nut on bolt finger tight.
2. Position clamp inside spring as shown in Figure 16
so that it seats freely on spring end without any
hang-up. Raise control arm to the spring then pass
bolt, with flat washer installed, up through control
arm and clamp. Install lock washer and nut. Torque
to 50 ft. lbs.
3. Place arm adjacent to axle. Pass bolt over axle
and through holes in arm.
4. Place shock absorber bracket on ends of
“ \5”
bolt,
install nuts and torque to 200 ft. lbs.
5. Lower the vehicle to put full weight of unloaded ve­
hicle on the front and rear suspension, torque control
arm pivot bolts to 140 ft. lbs.
COIL SPRING AND AUXILIARY LEAF SPRING
(Series C-P10 and C20)
Rem oval
Coil Sp ring
1. Remove shock absorber bolt from mounting bracket
at control arm.
2. Remove vehicle weight from rear suspension by
jacking up frame and adjust axle-to-frame height so
that spring is not under tension.
3. Remove upper and lower clamps from spring by
backing out lower bolt from underside of control
arm, and upper bolt from inside spring (fig. 17).
4. Lower control arm sufficiently to permit removal of
spring.
A u x ili a r y Spring
1. The auxiliary spring is secured to the frame mounted
retaining bracket by one retaining bolt. Before at­
tempting to remove spring, make sure there is no
load on spring and that spring leaf does not contact
the control arm mounted bumper (fig. 4).
2. Remove cotter pin from spring retaining bolt then
remove nut and remove spring from the frame
bracket.
3. If auxiliary spring contact bumper is to be removed,
support vehicle at rear axle, remove “ U” bolts and
remove bumper from its position on the control arm.
Installation
Coil Spring
1. Place spring clamp inside spring. Position clamp so
that the end of the spring coil is within the area of
the notch as shown in Figure 16 so that it seats
freely on spring end without any hang-up and locate
over bolt hole in control arm.
2. Pass clamp bolt with washer up through hole in con­
trol arm and loosely install nut.
3. Position upper clamp inside spring and install bolt
and washer. Torque nut to 50 ft. lbs.
Fig. 17—Spring Removal (Series C -P 1 0 and C20)
4. Connect shock absorber to control arm bracket--
torque nut to 130 ft. lbs.
5. Torque spring lower clamp bolt to 45 ft. lbs. Remove
jack from beneath frame.
A u x ili a r y Spring
1. Position auxiliary spring bumper between the control
arm and the axle housing. Align holes in spring
bracket with those in the control arm; position shock
absorber bracket to underside of control arm; install
“ U”
bolt over axle and through auxiliary spring
bracket control arm and shock absorber bracket;
install and alternately torque
“ XJ”
bolt retaining nuts
to 270 ft. lbs.
2. Position auxiliary spring assembly in frame mounted
bracket so that free end of spring is positioned above
bumper and align spring-to-bracket bolt holes. In­
stall bolt with washer through top side of bracket
then install nut and washer to through bolt. Torque
nut to 370 ft. lbs. and install cotter pin.
LEAF SPRINGS
Shackle Replacement (Series P20 and C-P30)
1. Remove load from spring by jacking frame.
2. Remove lubrication fitting from spring eye and
shackle pins (fig. 18).
3. Remove lock bolts from shackle and hanger.
4. Install Tool J-8118 in end of spring eye pin, and
using slide hammer (Tool J-2619 with adapter
J-2619-4) pull pin out of spring. Pull shackle pin
out of hanger and separate shackle from spring and
hanger.
5. Place bushed portion of new shackle in hanger.
6. Insert plain end of pin into hanger and shackle with
slot in pin positioned to receive locking bolt when in­
stalled. Push pin in until slot lines up with locking
bolt hole in bracket. Install locking bolt, washer and
nut.
7. Align spring eye in shackle yoke and install spring
eye pin, locking bolt, washer and nut.
8. Install lubrication fittings and lubricate the bushings.
Shackle Replacement (Series K10 and K20)
1. Remove load from spring by jacking fram e.
CHEVROLET TRUCK SERVICE MANUAL