Lower Control Arm - GMC 1976 ZEO 6083 Maintenance Manual

3A- 1 4 FRONT SUSPENSION
Figure 16-Removing Torsion Bar
LOWER CONTROL ARM
REMOVAL
1 . Hoist vehicle and remove wheel assembly .
2. Before using Tool J-22517-02, remove two
nuts and center screw, then place tool over cross-
member support. Align pin of tool into hole in cross
member . Install two nuts on tool and center screw:
Turn center screw until seated in dimple of torsion
adjusting arm. (figure 16).
3 . Using a socket on the torsion bar adjusting
bolt, turn counterclockwise, counting the number of
turns necessary to remove .
NOTE : The number of turns to remove the ad-
justing bolt will be used when installing, to ob-
tain the original carrying height.
4. Remove adjusting bolt and nut.
5. Turn center screw of Tool J-22517-02 until
torsion bar is completely relaxed and remove torsion
bar noting which end is front.
6. Disconnect shock absorber and stabilizer link
from lower control arm.
7. Remove drive axle nut.
8. Remove cotter pin and nut from lower ball
joint stud .
9. Install Tool J-24319 and remove ball joint stud
from knuckle. (figure 15)
10 . Remove bolts from lower control arm to
frame and remove torsion bar.
11 . Push inboard on drive axle and pull outward
on knuckle to gain clearance, then remove lower
control arm from knuckle.
INSTALLATION
See CAUTION on Page 3A-1 of this section.
1 . Install lower control arm making certain shock
absorber is guided onto lower control arm shock
absorber mount. Guide ball joint stud into knuckle.
Install but do not torque stud nut.
2 . Install lower control arm to frame bracket
bolts. Install nuts and torque to 90 ft .-lbs.
3 . Torque lower ball joint stud to 100 ft . lbs.
NOTE :
Do not back off nut to install NEW cot-
ter pin.
4. Install shock absorber nut and torque to 90 ft .
lbs. Install stabilizer link and torque nut to 15 ft . lbs.
5. Apply a liberal amount of chassis grease to
both ends and place front end of torsion bar into
control arm. Push torsion bar all the way forward
into the control arm.
6. Insert adjusting arm into the crossmember and
position 1-3/4" - 2" below the centerline of the cross-
member (See figure 17). Slide torsion bar rearward
until it is flush with the rear face of the adjusting
arm.
Figure 17-Positioning of Adjusting Arm