Chevrolet 1980 Light Duty Truck Service Manual page 345

12-1/4" RING G E A R A X L E
AXLE ASSEMBLY
The axle assembly removal and installation is identical
to the procedure given earlier for "Chevrolet 10-1/2" Ring
Gear Axle".
AXLE VENT
Replacement
Service replacement axle housing assemblies are not
equipped with an axle vent; therefore, always make sure that
a new vent assembly is installed when replacing the housing.
If axle vent requires replacement, pry old vent from housing
being sure that entire vent is removed. Prick punch around
carrier hole to insure fit of replacement vent. Tap new vent
into housing using a soft-faced hammer. Vent should be
positioned in housing so that flat surface is toward
centerline of differential carrier. See figure 4B-37.
AXLE SHAFT
Replacement
1. Remove hub cap, and install Tool J-8117 in tapped
hole on shaft flange.
2. Install slide hammer, Tool J-2619, and remove axle
shaft.
3. Thoroughly remove old gasket material from hub
and hub cap. Clean shaft flange and mating surfaces in the
wheel hub.
4. Install axle shaft so that the flange splines index into
hub splines. Tap shaft into position, using J-8117 and J-
2619.
5. Install new gasket, position flange to hub and install
attaching bolts. Torque bolts to specifications.
Fig. 4B-38~Removing Hub Outer Bearing Retainer Ring
HUB AND DR U M ASSEMBLY
Removal
Use the procedure given for "Chevrolet 10-1/2" Ring
Gear Axle", and use J-0870 to remove the adjusting nut.
Refer to figure 65.
Bearing Cup-Rem oval
1. Cut a suitable length of 1/2 inch steel bar stock for
press-out tool.
2. Place bar stock tool behind inner bearing cup, index
tool in provided notches, and press out cup with an arbor
press.
3. Use J-22380, as shown in figure 4B-38, to remove
outer bearing retainer ring.
4. Remove the outer bearing by driving on the axle
shaft spacer, using the splined flange cut from an old axle
shaft, as shown in figure 4B-39.
Inspection and Cleaning o f Bearings
Refer to procedures listed for "Chevrolet 10-1/2" Ring
Gear Axle.
Bearing C up-lnstallation
1. To install outer bearing, place axle shaft spacer in
hub, followed by the outer bearing. The larger O.D. of the
bearing goes toward the outer end of the hub.
2. Position outer bearing cup in hub with the thin edge
of the cup toward the outer end of the hub.
3. Press the cup into the hub, using J-8114 and Handle
J-8092.
4. Withdraw cup installer, then install retainer ring,
using J-22380 as shown in figure 4B-37. Press the cup into
contact with the retainer ring as shown in figure 4B-39.
REAR AXLE 4B-21
LIG H T T R U C K S ER V ICE M ANUAL