Chevrolet 1977 light duty truck, Service Manual

Page: 373 / 861

slot o f outer nut. This m ethod o f adjustm ent will result
in the p ro p e r hearing adjustm ent.
DRIVE P IN IO N OIL SEAL
Replacement
N O T E : The pinion oil seal may he replaced with
the carrier assembly installed in the vehicle.
1. Disconnect propeller shaft.
2. Scribe a line down the pinion stem, pinion nut
an d co m p a n io n flange.
3. Use J-8614-11 to rem ove the pinion nut and the
c o m p a n io n flange.
4. Pry the oil seal from the bore, using care not to
d a m a g e the m achined surfaces. Thoroughly clean all
foreign m aterial from contact area.
5. Lubricate the cavity between the seal lips with a
high melting point bearing lubricant.
6. Install a new pinion oii seal into the bore, using
J-24434.
7. Reinstall the co m p a n io n flange, pinion nut and
propeller shaft.
CAUTIO N: See C A U T IO N on page 1 o f this
section, regarding the above fasteners.
D A N A 1 0 - 1 / 2 R I N G G E A R A X L E
D A N A 9 - 3 / 4 R I N G G E A R
A X L E
Procedures for service to axle assembly, axle shafts,
hub and drum com ponents and bearing adjustm ents are
identical to those listed for "C h ev ro let 10-1/2 Ring G e a r
Axle".
Drive pinion oil seal replacem ent requires different
special tools for the D a n a axles. Follow the same
procedure listed for "C hevrolet 10-1/2" Ring G e a r
Axle"; use J-24384 for seal replacem ent on D a n a 10-
1/2 " R in g G e a r Axles, an d use J-22281 for pinion oil
seal rep lacem en t on D a n a 9 - 3 / 4 " Ring G e a r Axles.
1 2 - 1 / 4 R I N G G E A R A X L E
AXLE ASSEMBLY
T h e axle assembly removal and installation is
identical to the procedure given earlier for "C hevrolet
10-1/2" Ring G e a r Axle".
AXLE V E N T
Replacement
Service rep lacem en t axle housing assemblies are not
e q u ip p ed with an axle vent; therefore, always make sure
that a new vent assembly is installed w hen replacing the
housing. If axle vent requires replacement, pry old vent
from housing being sure th a t entire vent is removed.
Prick punch a ro u n d carrier hole to insure fit o f
replacem ent vent. T a p new vent into housing using a
soft-faced h am m er. Vent should be positioned in housing
so that flat surface is toward centerline o f differential
carrier. See figure 4B-36.
Fig. 4B-36--Typical Axle Vent In sta lla tion
AXLE SHAFT
Replacement
1. Remove hub cap, and install Tool J-8117 in
tapped hole on shaft flange.
2. Install slide h am m er, Tool J-2619, and remove
axle shaft.
3. Thoroughly remove old gasket m aterial from
hub and hub cap. Clean shaft flange and m ating
surfaces in the wheel hub.
4. Install axle sh aft so that the flange splines index
into hub splines. T a p 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.
H U B AND D R U M ASSEMBLY
Removal
Use the procedure given for "Chevrolet 10-1/2"
Ring G e a r Axle", and use J-0870 to remove the adjusting
nut.
Bearing Cup—Removal
1. Cut a suitable length o f 1/2 inch steel b ar stock
for press-out tool.
2. Place b a r stock tool behind inner bearing cup,
index tool in provided notches, and press out cup with an
a rb o r press.
3. Use J-22380, as shown in figure 4B-37, to
remove outer bearing retain er ring.
4. Remove the outer bearing by driving on the
axle sh aft spacer, using the splined flange cut from an
old axle shaft, as shown in figure 4B-38.
V E N T A S S E M B L Y
T O B E I N S T A L L E D W I T H
F L A T S U R F A C E F A C I N G
C E N T E R L I N E O F R E A R
A X L E D I F F E R E N T I A L
H O U S I N G .