GMC 1982 Light Duty Truck Service Manual page 439

Fig. 4Bl-28--Drive Pinion Nut Removal
J-8614-3 while holding J-8 614 -11 as shown in figure
4B1-29.
6. To remove the drive pinion, first thread the original
pinion nut half way on the pinion, for thread protection.
7. Place the differential cover temporarily back onto the
housing, using two screws. This will prevent the pinion
from falling to the floor during removal.
8. Tap the end of the pinion nut with a large ham m er and
a soft drift, as shown in figure 4B1-30.
C are must be taken not to damage pinion bearings
while removing pinion from carrier. Inspect bearings
and cups for damage and replace if needed.
9. Remove the pinion oil seal and the front pinion bearing.
Remove the cover and retrieve the drive pinion from the
housing. Discard the pinion oil seal, nut, and collapsible
spacer. Use a new oil seal, nut and spacer on
reassembly.
Fig. 4Bl-29--Drive Pinion Flange Removal
Fig. 4B1-30--Removing Drive Pinion
Bearing Rem oval a n d C up Replacem ent
1. If front pinion bearing is to be replaced, drive outer
race from carrier using a drift in slots provided for this
purpose. T a p alte rn a te ly on opposite sides of the
bearing cup to avoid cocking.
2. If rear pinion bearing is to be replaced drive outer race
from carrier using a drift in slots provided for this
purpose.
3. Remove rear pinion bearing from pinion shaft using
press plate J - 8 6 12 for 8-1 /2 " ring gear and J- 2 2 9 12 for
8 -7/8" J - 2 2 9 12-01 for 9 1/2" ring gear as shown in
Figure 4B1-31.
Tighten nuts on tool until plates are under the bearing
inner race. Then set the tool on a press. Make sure the
plates straddle the opening on the press. Do not position
bolts across the opening. To do so may bend the bolts
when pressure is applied. Press bearing from pinion.
Record the thickness of shim removed from between
bearing and pinion head.
4. Inspect c a rrie r pinion bearing bores and shoulders
Fig. 4B1-31--Removing Drive Pinion Rear Bearing
REAR A X LE 4 B 1 -1 1