GMC 1976 ZEO 6083 Maintenance Manual page 172

Remove housing from drive pinion . Remove "O"
ring seal from O.D . of bearing housing.
3 . Using a punch, drive seals out of housing on
the opposite side of the rear pinion bearing outer
race .
INSTALLATION
See CAUTION on Page 3C-1 of this section.
1 . Position seals as shown in Figure 45 and using
Tool J-22212, drive seals into housing until tool bot-
toms .
2. Position drive pinion into final drive and install
Seal Protector J-22236 over end of pinion .
CAUTION : Seal protector must be used or
inner seal lip will fold between seal case and
pinion shaft resulting in a leak.
3 . Install new "O" ring over O.D . of bearing
housing and install bearing housing over seal protec-
tor into position on the housing. Torque bearing
housing attaching bolts alternately to 45 ft . lbs.
Remove seal protector.
4. Apply Special Seal Lubricant No . 1050169 or
equivalent to right output shaft seal .
5. Install final drive. Refer td FINAL DRIVE-
INSTALLATION steps 3-17 .
FINAL DRIVE (REMOVED FROM
VEHICLE)
Figure 17-Final Drive Holding Fixture
DISASSEMBLY
FINAL DRIVE 3C- 9
Figure 18-Checking Pinion and Side Bearing
Pre-Load
1 . Install adapter J-22296-1 on Differential Hold-
ing Fixture J-3289 . Mount final drive in holding fix-
ture as shown in Figure 17 .
2 . Rotate housing so that pinion is up . Install
tools as shown in Figure 18, and turn torque wrench
several turns and record torque reading . This com
bined pinion and side bearing pre-load reading will
be helpful in determining cause of final drive failure.
Remove tools and rotate carrier so that pinion is
down .
3 . Rotate differential case several times to seat
bearings, then mount dial indicator as shown in Fig-
ure 19 . Use a small button on the indicator stem so
Figure 19-Checking Ring Gear to Pinion Gear
Backlash