Chevrolet 1980 Light Duty Truck Service Manual page 344

4B-20 REAR AXLE
R E M O V A I
Fig. 4B-34~Wheel Bolt Replacement
Check bearing play by grasping tire at top and pulling
back and forth, or by using a pry bar under tire. If bearings
are properly adjusted, movement of brake drum in relation
to brake flange plate will be barely noticeable and wheel will
turn freely. If movement is excessive, adjust bearing as
follows:
1. Remove axle shaft and raise vehicle until wheel is
free to rotate.
2. Keyways and threads on tube and nut must be clean
and free from chips, burrs and shavings.
3. Disengage tang of retainer and remove retainer
from axle housing tube.
4. Torque adjusting nut to 50 ft. lbs., at the same time
rotating the hub assembly and making sure bearing cones
are seated and in contact with the spindle shoulder.
Proper wheel bearing adjustment can be made using
tool J-2222-02 with some modification or tool J-2222-L
(Fig. 4B-36).
5. Back off nut until loose.
6. If adjusting nut slot is in alignment with keyway in
axle spindle, insert square key into slot. If adjusting nut slot
is not aligned, back off nut a slight amount and insert square
key into slot. Do not back off nut more than one slot to align
key.
7. Assemble snap ring at end of spindle to retain key
in position.
DRIVE PINION OIL SEAL
Replacement
The pinion oil seal may be replaced with the carrier
assembly installed in the vehicle.
1. Disconnect propeller shaft.
2. Scribe a line down the pinion stem, pinion nut and
companion flange.
3. Use J-8614-11 to remove the pinion nut and the
companion flange.
4. Pry the oil seal from the bore, using care not to
damage the machined surfaces. Thoroughly clean all foreign
material from contact area.
5. Lubricate the cavity between the seal lips with a
high melting point bearing lubricant.
INSTALLATION
Fig. 4B-35~Tightening Adjusting Nut-Typical
6. Install a new pinion oil seal into the bore, using
J-24434.
7. Reinstall the companion flange, pinion nut and
propeller shaft.
NOTICE: See NOTICE on page 1 of this section,
regarding the above fasteners.
D A N A 10-1/2" RING G E A R A X L E
DAN A 9-3/4" RING G E A R A X L E
Procedures for service to axle assembly, axle shafts,
hub and drum components and bearing adjustments are
identical to those listed for "Chevrolet 10-1/2 Ring Gear
Axle".
Drive pinion oil seal replacement requires different
special tools for the Dana axles. Follow the same procedure
listed for "Chevrolet 10-1/2" Ring Gear Axle"; use J-24384
for seal replacement on Dana 10-1/2" Ring Gear Axles, and
use J-22281 for pinion oil seal replacement on Dana 9-3/4"
Ring Gear Axles.
LIG H T T R U C K S ER V IC E M AN UAL