GMC 1976 ZEO 6083 Maintenance Manual page 182

Figure 51-Installing Tool J-22822
SIDE BEARING PRE-LOAD ADJUSTMENT
Differential side bearing pre-load is adjusted by
means of shims placed between the side bearing and
housing. Shims are used on both sides and 19 shims
are available in increments of .002" from .038" to
.074" . Two spacers .140" -}- .005", are used one on
the right side and one on the left side . By adding or
subtracting the same amount of shims from both
sides, the ring gear to pinion backlash will not
change .
1 . Before installing the case assembly, make sure
that side bearing surfaces in the housing are clean
and free of burrs. Side bearings must be oiled with
Lubricant No . 1051022 or equivalent . Turn fixture
and housing so cover side is up .
2. Place differential case and bearing assemblies
in position in housing.
3. Install the original spacers on left and right
side . If the recorded side bearing pre-load was cor-
rect on disassembly, the original shims may be used .
4. Install Spreader J-22196 on housing and
spread housing just enough so that shim can be in-
serted between the spacer and the housing. (figure
52)
5 . Release tension on spreader tool install side
bearing caps, and torque cap bolts to 75 ft . lbs., then
check pre-load as shown in Figure 53 . Pre-load
should be 10 to 15 in . lbs. for new bearings, 5 to 7
Figure 52-Spreading Housing For Shim Installation
Figure 53-Checking Pinion And Side Bearing
Pre-Load
in . lbs . for old bearings over the pinion bearing pre-
load .
6. If pre-load is not within specifications, obtain
proper combination of shims, either thicker or thin-
ner, until side bearing pre-load is 10 to 15 in . lbs. for
new bearings, 5 to 7 in . lbs. for old bearings over the
pinion bearing pre-load .
BACKLASH ADJUSTMENT
FINAL DRIVE
3C- 1 9
1 . Rotate differential case several times to seat
bearings, then mount dial indicator as shown in Fig-
ure 54 . Use a small button on the indicator stem so
that contact can be made near heel end of tooth . Set
dial indicator so that stem is in line as nearly as
possible with gear rotation and perpendicular to
tooth angle for accurate backlash reading.