GMC 1976 ZEO 6083 Maintenance Manual page 128

2- 4
FRAME
Figure 3-Removing Rear Bumper
REAR FRAME EXTENSION REMOVAL
1 . Remove rear bumper by removing both
bumper bracket thru bolts as shown in Figure 3 .
Then remove face bar assembly .
2. Remove the 4 bolts and nuts securing energy
absorbers to the frame.
3 . Remove spare tire carrier from rear crossmem-
ber by removing 8 bolts and nuts .
4. Using a small hydraulic or screw jack and a 3
foot wood 2x4, place jack in the middle of floor
section using the 2x4 to support the floor weight,
lengthwise .
5. Remove the bolt in each rear mounting pad.
Location of mounts are shown in Figure 4.
NOTE:
To reach bolt head inside rear of vehicle
some interior components may have to be
removed.
6. Remove tailpipe from rear section by loosening
clamp at slip joint.
7. Drain water from water supply tank .
8. Remove holding tank dump pipe from retain-
ing clamp on rear crossmember .
9. Remove motor generator assembly (if so
equipped).
10 . Remove 8 nuts and bolts securing rear frame
extension to side rails.
11 . Slide out rear frame extension.
REAR FRAME EXTENSION
INSTALLATION
Installation of the rear frame extension is accom-
plished by reversing the removal procedures .
NOTE :
The rear frame extension to frame assem-
bly retaining nuts should be tightened to 50-60
foot-pounds torque .
BODY MOUNTING
Should it become necessary to replace any body
mounting components, refer to figure 4. Front and
rear body mount nut torque is 50 - 60 foot-pounds .
If any of the insulators between the frame and
body must be replaced, be sure the old insulator is
entirely removed. Then using a waterproof adhesive
attach new insulator to frame in locations shown in
Figure 4.
IMPORTANT:
Some vehicles are equipped with
insulators different than shown in Figure 4. Late
model vehicles are equipped with 21 six-inch
insulators located beneath the lateral crossmem-
bers of the floor substructure .