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2F-24 AXLES - FRONT HUBS
Inspect the pinion bearing cones, cups, and rollers for
pitting, galling, excessive wear, or other visible damage.
Replace any part that exhibits any of these conditions.
Inspect the axle housing for cracks, porosity, bent or
loose tubes, or other damage. In addition, if raised metal
was created on the pinion bearing cup bore shoulders
during cup removal, flatten it using a blunt punch.
Inspect the pinion gear for damaged bearing journals,
damaged shim surfaces, or excessively worn splines. If
pinion replacement is necessary, replace both the pinion
gear and ring gear as a matched set only.
Inspect the pinion yoke for cracks, worn splines, and a
pitted, rough, or corroded oil seal contact surface. Re
pair or replace the yoke as necessary.
Inspect the pinion gear depth adjustment shims for
being broken, damaged, or distorted. Replace the shims
as necessary before adjusting pinion gear depth.
Differential Assembly
Pinion Gear Installation and Depth Adjustment
Pinion gear depth is the distance (measured in inches)
from the end (bottom) face of the pinion gear to the
centerline of the axle shafts (fig. 2F-35). This dimension
is controlled by shims installed between the pinion gear
rear bearing cup and axle housing (fig. 2F-35).
Ring and pinion sets are factory tested to detect ma
chining variances. Tests are started at a standard set
ting which is then varied to obtain the most desirable
tooth contact pattern and quiet operation. When this
setting is determined, the ring and pinion gear are
etched with identifying numbers (fig. 2F-36).
The ring gear receives one number. The pinion gear
receives two numbers which are separated by a plus (+)
or minus (-) sign.
The second number on the pinion gear indicates pinion
position, in relation to the centerline of the axle shafts,
where tooth contact was best and gear operation was
quietest. This number represents pinion depth variance
and indicates the amount, in thousandths of an inch,
that the gear set varied from the standard setting. The
number on the ring gear and first number on the pinion
gear identify the gears as a matched set. Do not attempt
to use a ring and pinion set having differing numbers.
This is not a matched set.
The standard setting for AMC/Jeep axles is 2.547
inches (6.46 cm). If the pinion is marked +2, the gear set
varied from standard by +0.002 inches (0.05 mm) and
will require 0.002 inch (0.05 mm) less shims than a gear
set marked zero (0). When a gear set is marked plus (+),
the distance from the pinion end face to the axle shaft
centerline must be more than the standard setting. If
the pinion gear is marked -3, the gear set varied from
standard by 0.003 inches (0.07 mm) and will require
0.003 (0.07 mm) more shims than a set marked zero (0).
When a set is marked minus (-), the distance from the
pinion end face to the axle shaft centerline must be less
than the standard setting. Refer to figure 2F-35 for an
illustration of the standard setting dimension.
NOTE: On some factory installed gear sets, an addi
tional 0.010 or 0.020 inches (0.25 or 0.50 mm) may have
been machined offthe pinion gear bottom face. This does
not affect gear operation but does affect pinion gear
marking and depth measurement Pinion gears machin
ed in this fashion have different identifying numbers.
For example, if the pinion is marked +23, the number2
indicates that 0.020 (0.050mm) was removed from thepi-
nion bottom face and the number 3 indicates that
variance from the standard setting is +0.003 (0.07 mm).
If the pinion is marked +16] the number1 indicates that
0.010 (0.25 mm) was removed from the pinion bottom
face and the number 6 indicates that variance from the
standard setting is +0.006 (0.15mm). Gear sets with ad
ditional amounts machined off the pinion bottom face
are factory installed items exclusively. All service
replacement gear sets will be machined to standard set
tings only. In addition, replacement gear sets marked +
or —0.009 (0.22 mm) or more, or sets with mismatched
identifying numbers must be returned to the parts
distribution center. Do not attempt to install these gear
sets.
Pinion Variance Chart
This chart will help to determine the approximate
"starter shim" thickness needed for initial pinion depth
measurement. However, the chart will not provide the
exact shim thickness required for final adjustment and
must not be used as a substitute for an actual pinion
depth measurement.
To use the chart, proceed as follows:
shim.
(a) Measure thickness of original pinion depth
(b) Note pinion depth variance numbers
marked on old and new pinion gears.
(c) Refer to Old and New Pinion Marking col
umns in chart. Chart box where old and new pinion
depth variances intersect will provide approximate
amount of change required to achieve desired starter
shim thickness.
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