Lower Control Arm - GMC G Service Manual

3C-28 FRONT SUSPENSION
6. Bolts (4), shim packs (18), spacers (19) and nuts (27).
• Position shims in their original positions. Make
sure the convex and concave sides of the shims
are together.
H X l Tighten
• Nuts (27) to 142 N*m (105 ft. lbs.).
• Remove the safety chain.
7. Wheel and tire assembly.
• Check the front end alignment and reset as required.
• Refer to FRONT END ALIGNMENT (SEC. 3A).
• Lower the vehicle.

LOWER CONTROL ARM

M Remove or Disconnect (Figures 5 through 13
Tool Required:
J 23742 Ball Joint Separator
• Raise the vehicle and support it with suitable safety
stands.
1. Wheel and tire assembly.
2. Caliper.
• Refer to HYDRAULIC FOUNDATION BRAKES
(SEC. 5A2).
3. Coil spring (32).
• Refer to "Coil Spring" in this section.
• The lower control arm is separated from the
frame.
• Use a jack to support the inboard end of the lower
control arm (36).
4. Cotter pin (34), then loosen the nut (35) one turn.
Figure 33 — Centering the Upper Control Arm Shaft (R-P20/2500, 30/3500 and G30/3500 Models)
5. Lower control arm (36) from the steering knuckle (31).
• Install J 23742, with the large cup end over the
upper ball joint nut (14). Extend threaded end
until the ball joint stud loosens from the steering
knuckle. Remove J 23742 and the nut (35).
H install or Connect (Figures 5 through 13)
1. Lower control arm (36) to the steering knuckle (31).
• Position the lower control arm ball joint stud (37)
into the steering knuckle (31).
2. Nut (35) onto the stud.
• Do not tighten.
3. Coil spring (32).
• Refer to "Coil Spring" in this section.
• This step results with the lower control arm
being attached to the frame.
NOTICE: See " Notice" on page 3C-1 of this
section.
4. Nut (35) and cotter pin (34).
R & l Tighten
• Nut (35) to 122 N*m (90 ft. lbs.).
• Tighten the nut if needed to install the cotter pin.
I T ! important
• Maximum torque to align the cotter pin is 175
N*m (130 ft. lbs.).
5. Caliper.
• Refer to HYDRAULIC FOUNDATION BRAKES
(SEC. 5A2).
• Check the front end alignment.
• Refer to FRONT END ALIGNMENT (SEC. 3A).
6. Wheel and tire assembly and lower the vehicle.