Chevrolet 1980 Light Duty Truck Service Manual page 284

3C-18 FRONT SUSPENSION
Fig. 3C-23--U.C.A. Rubber Bushing Installation
4. The pivot shaft may now be removed from the
control arm assembly.
5. Reposition the control arm in the vise and repeat
the removal procedure on the remaining bushing.
Bushing Installation
1. Again using "C" clamp J-24435-7 and installers J-
24435-4 (outer) and J-24435-5 (inner) tighten clamp to
install bushing onto control arm.
2. Install pivot shaft into inside diameter of first
installed bushing.
3. Install remaining bushing as shown in Figure 3C-23
and described in step 1.
4. Remove tools and install control arm on vehicle
following procedure described below. Torque all fasteners
to proper specifications.
Upper Control Arm Installation
See NOTICE on page 1 of this section
NOTICE:
regarding the fasteners referred to in steps 1, 2 and 3.
When installing the upper control arm be sure to
position the special aligning washers to the pivot shaft with
concave and convex sides together.
1. Place control arm in position on bracket and install
nuts. Before tightening nuts, insert caster and camber shims
in the same order as when removed. Torque the nuts to
specifications.
A normal shim pack will leave at least two (2) threads
of the bolt exposed beyond the nut. If two (2) threads cannot
be obtained: Check for damaged control arms and related
parts. Difference between front and rear shim packs must
not exceed 7.62 mm (.30 inches). Front shim pack must be
at least 6.09 mm (.24 inches).
Always tighten the thinner shim packs' nut first for
improved shaft to frame clamping force and torque
retention.
2. Insert ball joint stud into steering knuckle and
install nut. Torque stud nut to specifications and install
cotter pin.
J—24435-7
Fig. 3C-24~Lowering Control Arm for Bushing Replacement
3. Install brake caliper assembly if removed (see
section 5).
4. Remove adjustable support from under lower
control arm. Install wheel and tire assembly.
5. Lower the vehicle to the floor.
LOWER CONTROL A RM ASSEM BLY
Removal
1. Raise vehicle on hoist and remove spring as outlined
under spring removal. Support the inboard end of the
control arm after spring removal.
2. Remove cotter pin from lower ball stud and loosen
stud nut one turn.
3. Install Ball Stud Remover J-23742, position large
cup end of the tool over the upper ball stud nut and piloting
the threaded end of tool on end of the lower ball stud.
Extend bolt from Tool J-23742 to loosen lower ball stud in
steering knuckle. When stud is loosened, remove tool and
nut from lower stud.
It is necessary to remove the brake caliper assembly
and wire it to the frame to gain clearance for tool J-23742.
See section 5 for proper procedure.
4. Remove the lower control arm.
Lower Control Arm Inner Pivot S haft and/or
Bushing Replacement-On Vehicle
C10 (Rubber Bushings)
Removal (Figs. 3C-24, 3C-25)
If just bushings or pivot shaft are to be replaced the
lower control arm does not have to be removed from the
vehicle.
1. Raise vehicle on hoist and support the frame so that
the control arms hang free.
2. Position an adjustable floor jack under the lower
control arm inboard of spring and into depression of control
arm.
3. Install a chain over the upper arm inboard of the
stabilizer and outboard of shock absorber as a safety
measure.
4. Disconnect shock and stabilizer bar attachments at
lower control arm.
LIG H T T R U CK SER V IC E M AN UAL