1995 JEEP YJ differential

Place adapter rings so they do not damage
the bearing cage.
(2) Remove bearing shims from case hubs and
mark them (with hub identity) for assembly refer-
ence. Record the thickness of the shims.
(3) Clamp the differential case in a vise equipped
with soft jaws. Remove anddiscardthe ring gear
bolts. Tap the ring gear with a rawhide or plastic
mallet and remove (Fig. 28).(4) Use a drift to remove the pinion gear mate
shaft lock pin (Fig. 29).
(5) Remove the mate shaft with a drift and ham-
mer (Fig. 30).
(6) Rotate the differential side gears and remove
the pinion mate gears and thrust washers (Fig. 31).
(7) Remove the differential side gears and thrust
washers.
(8) Remove the case from the vise.
PINION REMOVAL/DISASSEMBLY
(1) Remove the pinion yoke nut and washer. Use
Remover C-452 and Wrench C-3281 to remove the
pinion yoke (Fig. 32).
(2) Remove the pinion gear seal with a slide ham-
mer or pry out with bar.
Fig. 27 Differential Bearing Removal
Fig. 28 Ring Gear Removal
Fig. 29 Mate Shaft Lock Pin Removal
Fig. 30 Mate Shaft Removal
2 - 36 FRONT SUSPENSION AND AXLEJ

(3) Drive out pinion gear from housing with raw-
hide or plastic hammer (Fig. 33). Catch the pinion
with your hand to prevent it from falling and being
damaged.This will damage the front bearing
rollers and bearing cup. The front bearing and
cup must be replaced.Remove preload shims and
record the thickness.
(4) Remove front bearing from housing.
(5) Remove the front pinion bearing cup and seal
with Remover D-147 and Handle C-4171 (Fig. 34).
(6) Remove the rear bearing cup from housing (Fig.
35). Use Remover D-149 and Handle C-4171.
(7) Remove the inner bearing from the pinion with
Puller C-293-PA and Adapter C-293-39 (Fig. 36).
Place adapter rings so they do not damage
the bearing cage.(8) Remove the oil slinger from the pinion gear
shaft.Save the slinger it is used as select shim
for pinion depth.
CLEANING/INSPECTION
Wash differential components with cleaning solvent
and dry with compressed air.Do not steam clean
the differential components.
Wash bearings with solvent and towel dry, or dry
with compressed air. DO NOT spin bearings with
Fig. 31 Pinion Mate Gear Removal
Fig. 32 Pinion Yoke Removal
Fig. 33 Remove Pinion Gear
Fig. 34 Front Bearing Cup Removal
JFRONT SUSPENSION AND AXLE 2 - 37

compressed air.Cup and bearing must be re-
placed as a matched sets only.
Clean axle shaft tubes and oil channels with clean
cloth.
Inspect for;
²Smooth appearance with no broken/dented sur-
faces on the bearing rollers or the roller contact sur-
faces.
²Bearing cups must not be distorted or cracked.
²Machined surfaces should be smooth and without
any raised edges.²Raised metal on shoulders of cup bores should be
removed with a hand stone.
²Wear or damage to pinion gear mate shaft, pinion
gears, side gears and thrust washers. Replace as a
matched set only.
²Worn or chipped teeth to ring and pinion gears.
²Damaged bolt threads to ring gear. Replaced as a
matched set only.
²Pinion yoke for cracks, worn splines, pitted areas,
and a rough/corroded seal contact surface. Repair or
replace the as necessary.
DIFFERENTIAL ASSEMBLY
ASSEMBLY
(1) Install the following components in the differ-
ential case (Fig. 37).
²Differential side gears and thrust washers
²Pinion gears and thrust washers
²Pinion gear mate shaft (align holes in shaft and
case)
(2) Install and seat the locking roll pin in the dif-
ferential case and mate shaft with a punch and ham-
mer (Fig. 37). Peen metal part of case over pin in two
places 180 degrees apart.
If replacement gears and thrust washers were
installed, it is not necessary to measure the
gear backlash. Correct fit is due to close ma-
chining tolerances during manufacture.
(3) Invert the differential case and start two ring
gear bolts. This will provide case-to-ring gear bolt
hole alignment.
(4) Install new ring gear bolts and alternately
tighten to 95-122 Nzm (70-90 ft. lbs.) torque (Fig. 38).
Fig. 35 Rear Bearing Cup Removal
Fig. 36 Inner Bearing Removal
Fig. 37 Mate Shaft Pin Installation
2 - 38 FRONT SUSPENSION AND AXLEJ

(5) Lubricate all differential components with hy-
poid gear lubricant.
PINION GEAR DEPTH INFORMATION
Ring and pinion gears are supplied as matched sets
only. The identifying numbers for the ring and pinion
gear are etched into the face of each gear (Fig. 39). A
plus (+) number, minus (-) number or zero (0) is
etched into the face of the pinion gear. This number
is the amount (in thousandths of an inch) the depth
varies from the standard depth setting of a pinion
etched with a (0). The standard setting from the cen-
terline of the ring gear to the back face of the pinion
is 92.1 mm (3.625 inches) for Model 30 axles (Fig.
40). The standard depth provides the best teeth con-
tact pattern.THE BUTTON END ON THE PINION GEAR
HEAD IS NO LONGER A MACHINED-TO-SPECIFI-
CATIONS SURFACE. DO NOT USE THIS SUR-
FACE FOR PINION DEPTH SET-UP OR
CHECKING (Fig. 40).
Compensation for depth variance is achieved by a
selected thickness oil slinger (production) or shims
(service). The slinger is placed between the inner pin-
ion bearing cone and gear head (Fig. 41). The shim
pack is placed under the inner (rear) bearing cup for
service. To change the pinion adjustment, shims are
available in thicknesses of 0.003, 0.005, and 0.010
inch.The oil slinger or baffle must be measured
and the thickness included with the total shim
pack.
Fig. 38 Ring Gear Bolt Installation
Fig. 39 Pinion Gear ID Numbers
Fig. 40 Pinion Gear Head
Fig. 41 Shim Locations
JFRONT SUSPENSION AND AXLE 2 - 39

New gear set: note the depth variance etched
into both the original and the replacement pin-
ion gear. Add or subtract the thickness of the
original depth shims to compensate for the dif-
ference in the depth variances. Refer to the
Depth Variance charts.
Note where Old and New Pinion Marking columns
intersect. Intersecting figure represents plus or mi-
nus amount needed.
For example, if old pinion is plus (+) 1 and the new
pinion is minus (-) 3, intersecting figure is (+)0.004
inch (0.10mm). Add this amount to the original shim.
Or if the old pinion is (-) 3 and the new pinion is (-)
2, intersecting figure is (-)0.001 inch (0.025mm). Sub-
tract this amount from original shim.Refer to the
Pinion Gear Depth Variance Chart.
DIFFERENTIAL AND PINION MEASUREMENT
DIFFERENTIAL ZERO END PLAY
MEASUREMENT
(1) Place Master Differential Bearing D-134
(D-348) on the case hubs (Fig. 42). Install differential
case into housing.
(2) Install a pilot stud at the right side of housing.
Attach Dial Indicator to the pilot stud. Load indica-
tor plunger against the back of the ring gear (Fig.
43).
(3) Insert a small pry bar between the bearing cap
and left side of differential case. Pry the case as far
as possible to right side (Fig. 43). Zero the dial indi-
cator pointer.
(4) Pry the case to left side andrecordthe travel
distance.The measurement above is the shim thickness
necessary for case zero end-play. The total
thickness will be determined during the ring
gear backlash adjustment.
(5) Remove indicator, pilot stud and differential
case from housing.
PINION GEAR DEPTH MEASUREMENT
Pinion gear depth measurement is necessary
when;
PINION GEAR DEPTH VARIANCE
Fig. 42 Master Bearing Tools On Hubs
2 - 40 FRONT SUSPENSION AND AXLEJ

²Axle housing or differential case is replaced
²Pinion select shim pack is unknown
²Ring and pinion gears are replaced
Measurements are done with pinion cups and pin-
ion bearings installed in housing. Take measure-
ments with Pinion Gauge Set 6774, Pinion Block
6733 and Dial Indicator C-3339 (Fig. 44).
(1) Install the pinion front bearing cup with In-
staller D-144 and Handle C-4171 (Fig. 45).(2) Install the bearing cup with Installer D-146
and Driver Handle C-4171 (Fig. 46). Ensure cup is
correctly seated.
(3) Assemble Pinion Gauge Set, Pinion Block and
pinion bearings. Install assembly into differential
pinion gear bore and hand tighten cone (Fig. 47).
(4) Place Arbor Disc 6732 on Arbor D-115-3 and po-
sition in the bearing cradles (Fig. 48). Install differ-
ential bearing caps on Arbor Discs and tighten caps
snug only.
Arbor Discs have different steps to fit other
axle sizes. Pick correct size step for axle being
serviced.
(5) Firmly place Scooter Block and Dial Indicator
on pinion height block tool and zero the dial indicator
pointer.
(6) Slide the Scooter Block across the arbor while
Fig. 43 Differential Case End Play Measurement
Fig. 44 Pinion Gear Depth Gauge Tools
Fig. 45 Pinion Front Bearing Cup Installation
Fig. 46 Pinion Rear Bearing Cup Installation
JFRONT SUSPENSION AND AXLE 2 - 41

observing indicator (Fig. 49). Record the longest
travel distance, whether inward (-) or outward (+),
indicated by the pointer.The plunger travel, plus or minus the vari-
ance etched in the gear, is the required thick-
ness for the depth shims.
(7) Measure the thickness of each depth shim with
a micrometer. Combine the shims necessary for total
required shim pack thickness.Include oil slinger
or baffle thickness with the total shim pack
thickness.
(8) Remove the measurement tools from the differ-
ential housing.
PINION GEAR ASSEMBLY/INSTALLATION
(1) Remove rear pinion bearing cup with Remover
D-149 and Handle C-4171. Place shims (and baffle if
equipped) in the pinion gear rear bearing bore. In-
stall the bearing cup with Installer D-146 and Driver
Handle C-4171. Ensure cup is correctly seated.
(3) Install rear bearing and oil slinger on pinion
gear with Installer W-262 until completely seated
(Fig. 50).
(4) Assemble preload shims onto pinion shaft.
(5) Install pinion front bearing cone into cup and
end yoke thrust washer.
(6) Apply a light coat of gear lubricant on lip of
new pinion seal. Install seal with Installer D-163 and
Handle C-4171 (Fig. 51).
(7) Install pinion gear into differential housing.
(9) Install yoke with Installer W-162-D and
Wrench C-3281 (Fig. 52).
(10) Install the yoke washer andold nuton the
pinion gear. Use Flange Wrench C-3281 to retain the
yoke (Fig. 53). Tighten nut to 216-352 Nzm (160-260
ft.lbs.) torque.
Fig. 47 Pinion Height Block
Fig. 48 Gauge Tools In Housing
Fig. 49 Pinion Depth Measurement
Fig. 50 Pinion Rear Bearing Installation
2 - 42 FRONT SUSPENSION AND AXLEJ

(11) Check bearing rotating torque with an inch
pound torque wrench (Fig. 54).If torque to rotate is
within specification, remove old nut and install new
nut. The torque necessary to rotate the pinion gear
should be;
²Original Bearings: 1 to 3 Nzm (10 to 20 in. lbs.).
²New Bearings: 2 to 5 Nzm (15 to 35 in. lbs.).
(12) If rotating torque is high, add shims to de-
crease torque. If rotating torque is low, remove shims
to increase torque.DIFFERENTIAL SHIM PACK MEASUREMENT AND
ADJUSTMENT
(1) Place Master Differential Bearing D-134
(D-348) on the case hubs.
(2) Install a pilot stud at the left side of housing.
Attach Dial Indicator to housing. Load the indicator
plunger against the back of the ring gear (Fig. 55).
Ensure ring and pinion gear teeth are tightly
meshed. Zero the indicator.
Fig. 51 Pinion Seal Installation
Fig. 52 Pinion Yoke Installation
Fig. 53 Tightening Pinion Nut
Fig. 54 Check Pinion Gear Torque
JFRONT SUSPENSION AND AXLE 2 - 43