GMC 1986 P-Truck Service Manual page 315

packs must not exceed 7.62 mm (0.30
inches). The front shim pack must be at
least 6.09 mm (0.24 inches).
Always tighten the thinner shim pack's nut
(27) first for improved shaft to frame
clamping force and torque retention.
$ Tighten
• Nuts (27) to " Specifications" at the end of
this section.
3. Upper control arm (28) to the steering knuckle
(31).
• Insert the upper control arm ball joint stud
(13) into the steering knuckle (31).
• Nut (14) and cotter pin (15).
Tighten
• Nut (14) to the " Specifications" at the end of
this section.
4. Caliper.
• Refer to BRAKES (SEC. 5).
5. Check the front end alignment.
• Refer to FRONT END ALIGNMENT (SEC.
3A).
6. Wheel and tire assembly. Lower the vehicle to the
ground.
SUSPENSION UNIT
The front suspension and frame crossmember can
be removed or installed as a unit if extensive service is
required.
Rem ove o r D isco n n e ct (F igure 5 th ro u g h 8,
and 31)
• Raise the hood and disconnect the battery
negative cable.
• Hoist the vehicle and support it with suitable
safety stands placed at the frame side rails.
Remove the tire and wheel assembly and then
lower the hoist.
1. Front brake hose clip from each upper control
arm.
2. Brake hoses from the calipers.
• Clean the area adjacent to the brake hose
fittings.
• Discard the special washers (2 on each
hose) and cover the disconnected ends of
each hose with suitable material.
• Refer to BRAKES (SEC. 5).
3. Tie rod ends from the steering knuckle (31).
• Refer to STEERING LINKAGE (SEC. 3B1).
4. Front stabilizer from the lower control arms (36).
• Nuts (38), washers (39, 41), bolts (43), and
clamps (42).
FRONT SUSPENSION 3C-29
5. Shock absorbers (20) from the lower control arms
(36).
• Nut (23), washer (22), and bolt (21).
6. Brake line clip bolts from the front suspension
crossmember.
• On C series models the clip is located under
the right side engine mount support bracket.
NOTICE: Failure to disconnect these clips
from the suspension unit w ill result in severe
damage to the brake line when the unit is
lowered from the vehicle.
7. Suspension crossm em ber from the engine
mounts.
• Refer to ENGINE (SEC. 6A).
8. Suspension crossmember from the frame rail
(figure 31).
9. Raise the hoist to support the suspension
crossmember.
10. Support the engine.
• Must be done before the suspension unit is
lowered from the vehicle.
11. Suspension unit and crossmember from the
vehicle.
• Upper control arm bracket to the frame side
rail nuts (10), washer (7), and bolts (6).
• Low er the su sp e n sio n u n it and the
crossmember to bring the unit clear of the
vehicle.
Install or Connect (Figures 5 through 8 and 31)
NOTICE: For steps 3, 7, and 8, refer to the
" N otice" on page 3C-1 of this section.
1. P o sitio n the new
crossmember and raise it with the hoist to align
the suspension crossmember and frame holes.
2. Suspension crossmember to the frame rail bolts
(figure 31).
3. Upper control arm (28) to the frame bracket bolts
6
( ).
• Washers (7) and nuts (10). Do not tighten.
$ Tighten
• Upper control arm to the frame bracket bolts
(6) to " Specifications" at the end of this
section.
• Suspension crossmember to the frame rail
bolts to " Specifications" at the end of this
section.
su sp e n sio n u n it and