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PART
4-2-REAR AXLE OVERHAUL
4-27
FIG. 66- Checking Pinion
Bearing Preload
4. Tighten the right nut two
notches beyond the position where
it
first contacts the bearing cup.
Rotate the differential case several
revolutions in each direction while
the bearings are loaded to seat the
bearings in their cups. This step is
important.
5. Again loosen the right nut to
release the preload. Check to see that
the left nut contacts the bearing cup.
Using a dial indicator, adjust the
preload to
0. 012
case spread for new
bearings or
0. 005
to
0
.
008
for the
original bearings, if re-used.
6. Check the run out of the differ-
ential case flange with a dial indicator.
If the runout does not now exceed
specifications, install a new drive
gear. If the run out still exceeds
FIG. 67- Pinion and Ring
Gear Markings
specifications, the ring gear is true
and the trouble is due to either a
defective case or worn bearings.
7. Remove the differential case
from the carrier and remove the side
bearings from the case.
8. Install new bearings on the
case hubs, and again install the differ-
ential assembly in the carrier with-
out the ring gear.
9l
Check the case runout again
with the new bearings. If the runout
is now within limits, the old bear-
ings were excessively worn. Use the
new bearings for assembly. If the
runout is still excessive, the case is
defective and should be replaced.
DRIVE PINION AND
RING GEAR SET
When replacing a ring gear and
pinion, note that the original factory
installed shim is of the correct thick-
ness to adjust for individual vari-
ati(ms in both the carrier housing
dimension and in the original gear
set dimension. Therefore, to select
the correct shim thickness for the
new gear set to be installed, follow
these steps:
1. With a micrometer, measure
the thickness of the original shim re-
moved from the axle and use the
same thickness upon installation of
the replacement carrier assembly or
drive pinion. If further shim change
is necessary, it will be indicated in
the tooth pattern check.
2. If the original shim is lost,
substitute a nominal shim for the
original and use the tooth pattern
check to determine if further shim
changes are required. Nominal shim
thickness is indicated in the Specifi-
cations Section.
A new ring gear and pinion should
always be installed in an axle as a
matched set (never separately). Be
sure the same identifying (mat-
ching) number, painted in white,
appears on the bolt hole face of
the ring gear and on the head of
the drive pinion (Fig. 67).
3. After determining the correct
shim thickness as explained in the
foregoing steps, install the new
pinion and ring gear as outlined
under Assembly.
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