GMC 1986 P-Truck Service Manual page 314

3C-28 FRONT SUSPENSION
1. Caliper.
• Refer to BRAKES (SEC. 5).
2. Coil spring (32).
• Refer to " Coil Spring," in this section.
• The lower control arm is separated from the
frame.
3. Use a jack to support the inboard end of the lower
control arm (36).
4. Lower control arm (36) from the steering knuckle
(31).
• Cotter pin (34), then loosen the nut (35) one
turn.
• Install J-23742, with the large cup end over
the upper ball jo in t nut (14). Extend
threaded end until the ball joint stud loosens
from the steering knuckle. Remove J-23742
and the nut (35).
Install or Connect (Figures 5 through 8)
1. Lower control arm (36) to the steering knuckle
(31).
• Position the lower control arm ball joint stud
(37) into the steering knuckle (31).
• Nut (35) onto the stud. Do not tighten.
2. Coil spring (32).
• Refer to " Coil Spring," in this section.
• This step results with the lower control arm
being attached to the frame.
NOTICE: Refer to " N otice" on page 3C-1 of
this section.
3. Cotter pin (34).
Tighten
• Nut (35) to 122 N m (90 ft. lbs.).
• Cotter pin. Tighten further to a maximum of
176 N m (130 ft. lbs.) for c o tte r pin
installation, if necessary.
4. Caliper.
• Refer to BRAKES (SEC. 5).
5. Check the front end alignment.
• Refer to FRONT END ALIGNMENT (SEC.
3A).
6. Tire and wheel assembly and lower the vehicle.
UPPER CONTROL ARM
+ + Remove or Disconnect (Figures 5 through 8,
and 15)
Tools Required:
J-23742 Ball Joint Separator
• Raise the vehicle and support it with suitable
safety stands. Remove the wheel and tire
assembly. Place an adjustable jackstand under
the lower control arm for support.
1. Caliper.
• Refer to BRAKES (SEC. 5).
2. Upper control arm (28) from the steering knuckle
(31).
• Cotter pin (15).
• Loosen the nut (14). Do not remove it.
• Install J-23742 with the large cupped end
over the lower control arm ball joint stud nut
(35). Expand J-23742 until the upper control
arm separates.
• Nut (14) from the upper ball joint stud and
raise the upper control arm to clear the
steering knuckle.
3. Upper control arm (28) from the frame bracket (9).
• Nuts (27), spacers (19), shims (18), washers
(5) and bolts (6).
Im portant
Tape the shims together in their original
positions and tag for proper relocation.
4 Install or Connect (Figures 5 through 8)
+ -
NOTICE: For steps 2 and 3, refer to " Notice"
on page 3C-1 of this section.
1. Shims (18) into position on the upper control arm
frame bracket (9).
• Make sure the shims are positioned with
concave and convex sides together.
2. Upper control arm (28) to the frame bracket
(9).
• Spacers (19) and nuts (27), washers (5), and
bolts (6).
Important
• A normal shim pack will leave at least two
threads of the bolt (6) exposed beyond the
nut.
• If two threads cannot be obtained; check for
damaged control arm or related parts. The
difference between the front and rear shim