GMC 1976 ZEO 6083 Maintenance Manual page 212

4- 2 8 REAR SUSPENSION
Figure 58-Installing Second Piston on Air Bellows
2 . Place control arm in position in mounting
bracket . Position thrust pack journal bearing be-
tween control arm and mounting bracket. (See figure
63).
3 . Press bracket pins into proper position .
4. Install control arm lock nuts .
Figure 59-Air Bellows Assembly
Figure 60-Repositioning Hat Section
5 . Tighten control arm lock nuts until hat section
spacers are firmly seated, then back off nut until
control arm moves freely, and retorque nuts to 15-20
ft . lbs.
6 . Install spindle with keyway up as shown in
Figure 61 using bolts and nuts to draw spindle into
suspension arm.
7 . Remove spindle bolts and nuts .
8 . Install backing plate assembly, new bolts,
washers and nuts as shown in Figure 62 . Torque
bolts 35-45 ft . lbs.
9. Referring to Figure 21, position unit on vehicle
and install four bolts from mounting bracket to
frame rail . Install two bolts from mounting bracket
to frame crossmember (See figure 20).
10 . Referring to Figure 20, install brake backing
plate by installing four bolts and nuts that secure
plate to control arm .
11 . Referring to Figure 18, install brake drums
and hubs on spindle. Tighten castilated nut (figure
17) to 25-30 ft . lbs., back nut off one half turn and
then finger tighten until cotter pin can be installed.
12 . Install shock absorbers to control arms .
13 . Install brake lines. Connect all mounting
brackets and connect lines at brake backing plates
and at control arm mounting bracket.
14 . Referring to Figure 13, install air bellows.
15 . Referring to Figure 11, connect leveling valve
link and torque nut to 60-90 in . lbs.