1998 DODGE RAM 1500 lock

(7) Push axle shaft inward and remove axle shaft
C-lock from the axle shaft (Fig. 21).
(8) Remove axle shaft (Fig. 22) carefully to prevent
damage to the shaft bearing and seal in the axle
tube.
INSTALLATION
(1) Lubricate bearing bore and seal lip with gear
lubricant.
(2) Insall axle shaft and engage into side gear
splines.
NOTE: Use care to prevent shaft splines from dam-
aging axle shaft seal.(3) Insert C-lock in end of axle shaft then push
axle shaft outward to seat C-lock in side gear.
(4) Insert pinion shaft into differential case and
through thrust washers and differential pinions.
(5) Align hole in shaft with hole in the differential
case and install lock screw with Loctiteton the
threads. Tighten lock screw to 11 N´m (8 ft. lbs.).
(6) Install differential cover and fill with gear
lubricant to the bottom of the fill plug hole.
(7) Install brake rotor, caliper adapter and caliper.
(8) Install wheel and tire.
(9) Remove support and lower vehicle.
AXLE SHAFT SEALS
REMOVAL
(1) Remove axle shaft.
(2) Remove axle shaft seal (Fig. 23) from the axle
tube with a small pry bar.
INSTALLATION
(1) Wipe the axle tube bore clean. Remove any old
sealer or burrs from the tube.
(2) Coat the lip of thenewseal with axle lubricant
and install a seal with Installer C-4076-B and Han-
dle C-4735-1.
NOTE: When tool contacts the axle tube, the seal is
installed to the correct depth.
Fig. 21 AXLE SHAFT C-LOCK
1 - C-LOCK
2 - AXLE SHAFT
3 - SIDE GEAR
Fig. 22 AXLE SHAFT
1 - AXLE SHAFT
2 - SUPPORT PLATE
3 - CALIPER
4 - PARK BRAKE SHOE ASSEMBLY
Fig. 23 AXLE SHAFT SEAL
1 - AXLE SEAL
2 - AXLE BEARING
3 - 94 REAR AXLE-91/4DR
AXLE SHAFTS (Continued)

(10) If rotating torque is low, use Holder 6719 to
hold the companion flange and tighten pinion nut in
6.8 N´m (5 ft. lbs.) increments until proper rotating
torque is achieved.
NOTE: The bearing rotating torque should be con-
stant during a complete revolution of the pinion. If
the rotating torque varies, this indicates a binding
condition.
NOTE: The seal replacement is unacceptable if the
final pinion nut torque is less than 285 N´m (210 ft.
lbs.).
(11) Install propeller shaft with the installation
reference marks aligned.
(12) Tighten the companion flange bolts to 108
N´m (80 ft. lbs.).
(13) Install brake rotors.
(14) Check the differential lubricant level.
DIFFERENTIAL COVER
REMOVAL
(1) With vehicle in neutral, position vehicle on
hoist.
(2) Remove drain plug.
(3) Remove cover bolts.
(4) Remove cover and drain lubricant.
INSTALLATION
(1) Apply a 6.35mm (1/4 in.) bead of Mopar Sili-
cone Rubber Sealant or equivalent to the housing
cover (Fig. 29).CAUTION: If housing cover is not installed within 3
to 5 minutes, the cover must be cleaned and new
RTV applied. Failure to heed caution may result in
damage.
(2) Install cover and identification tag. Tighten
cover bolts in a criss-cross pattern to 41 N´m (30 ft.
lbs.).
(3) Fill differential to specifications.
(4) Install fill plug.
DIFFERENTIAL
REMOVAL
(1) Remove filler plug from the differential cover.
(2) Remove differential cover and drain the lubri-
cant.
(3) Clean housing cavity with flushing oil, light
engine oil or a lint free cloth.
NOTE: Do not use steam, kerosene or gasoline to
clean the housing.
(4) Remove axle shafts.
(5) Remove RWAL/ABS sensor from housing.
NOTE: Side play resulting from bearing races being
loose on case hubs requires replacement of the dif-
ferential case.
(6) Mark differential housing and bearing caps for
installation reference (Fig. 30).
(7) Remove bearing threaded adjuster lock from
each bearing cap.
(8) Loosen differential bearing cap bolts.
Fig. 29 COVER SEALANT
1 - SEALANT
2 - DIFFERENTIAL COVER
Fig. 30 REFERENCE MARKS
1 - REFERENCE MARKS
2 - REFERENCE MARK
3 - BEARING CAPS
DRREAR AXLE - 9 1/4 3 - 97
PINION SEAL (Continued)

CAUTION: If cover is not installed within 3 to 5 min-
utes, the cover must be cleaned and new RTV
applied or adhesion quality will be compromised.
(8) Install the cover and any identification tag and
tighten cover bolts to 41 N´m (30 ft. lbs.).
(9) Fill differential with lubricant to bottom of the
fill plug hole. Refer to the Lubricant Specifications
for the correct quantity and type.
NOTE: Trac-lokŸ differential equipped vehicles
should be road tested by making 10 to 12 slow fig-
ure-eight turns. This maneuver will pump the lubri-
cant through the clutch discs to eliminate a
possible chatter noise complaint.
DIFFERENTIAL-TRAC-LOK
DESCRIPTION
The optional Trac-Loktdifferential case has a one-
piece design and the similar internal components as
a standard differential, plus two clutch disc pack-
s.The differential pinion mate shaft is retained with
a threaded pin. Differential bearing preload and ring
gear backlash are set and maintained by threaded
adjusters at the outside of the differential housing.
Pinion bearing preload is set and maintained by the
use of a collapsible spacer. The removable differential
cover provides a means for inspection and service.
OPERATION
This differential clutches are engaged by two con-
current forces. The first being the preload force
exerted through Belleville spring washers within the
clutch packs. The second is the separating forces gen-
erated by the side gears as torque is applied through
the ring gear (Fig. 40).
This design provides the differential action needed
for turning corners and for driving straight ahead
during periods of unequal traction. When one wheel
looses traction, the clutch packs transfer additional
torque to the wheel having the most traction. This
differential resist wheel spin on bumpy roads and
provide more pulling power when one wheel looses
traction. Pulling power is provided continuously until
both wheels loose traction. If both wheels slip due to
unequal traction, Trac-loktoperation is normal. In
extreme cases of differences of traction, the wheel
with the least traction may spin.
DIAGNOSIS AND TESTING
The most common problem is a chatter noise when
turning corners. Before removing the unit for repair,
drain, flush and refill the axle with the specified
lubricant. Add a container of Mopar Limited Slip
Additive after repair service or during a lubricant
change.
After changing the lubricant, drive the vehicle and
make 10 to 12 slow, figure-eight turns. This maneu-
ver will pump lubricant through the clutches. This
will correct the condition in most instances. If the
chatter persists, clutch damage could have occurred.
Fig. 38 BEARING CAPS
1 - REFERENCE MARKS
2 - REFERENCE MARKS
3 - ADJUSTER LOCK
4 - BEARING CAP
Fig. 39 COVER SEALANT
1 - SEALANT
2 - DIFFERENTIAL COVER
3 - 100 REAR AXLE-91/4DR
DIFFERENTIAL (Continued)

DIFFERENTIAL TEST
The differential can be tested without removing the
differential case by measuring rotating torque. Make
sure brakes are not dragging during this measure-
ment.
(1) Place blocks in front and rear of both front
wheels.
(2) Raise one rear wheel until it is completely off
the ground.
(3) Engine off, transmission in neutral, and park-
ing brake off.
(4) Remove wheel and bolt Special Tool 6790 or
equivalent tool to studs.
(5) Use torque wrench on special tool to rotate
wheel and read rotating torque (Fig. 41).
(6) If rotating torque is less than 41 N´m (30 ft.
lbs.) or more than 271 N´m (200 ft. lbs.) on either
wheel the unit should be serviced.
DISASSEMBLY
(1) Clamp Holding Fixture 8136 in vise and set
differential case on fixture (Fig. 42).
(2) Remove pinion gear mate shaft screw.
(3) Remove pinion gear mate shaft.
Fig. 40 TRAC-LOK LIMITED SLIP DIFFERENTIAL
1 - CASE
2 - RING GEAR
3 - DRIVE PINION
4 - PINION GEAR
5 - MATE SHAFT
6 - CLUTCH PACK
7 - SIDE GEAR
8 - CLUTCH PACK
Fig. 41 ROTATING TORQUE TEST
1 - SPECIAL TOOL WITH BOLT IN CENTER HOLE
2 - TORQUE WRENCH
Fig. 42 DIFFERENTIAL CASE FIXTURE
1 - HOLDING FIXTURE
2 - VISE
3 - DIFFERENTIAL
DRREAR AXLE - 9 1/4 3 - 101
DIFFERENTIAL-TRAC-LOK (Continued)

INSTALLATION
(1) Raise axle with lift and align to the leaf spring
centering bolts.
(2) Install axle U-bolts and tighten to 149 N´m
(110 ft. lbs.).
(3) Install shock absorbers to axle and tighten to
specification.
(4) Install all brake components.
(5) Align propeller shaft and pinion companion
flange reference marks and tighten companion flange
bolts to 115 N´m (85 ft. lbs.).
(6) Install the wheels and tires.
(7) Fill differential to specifications.
(8) Remove lift from axle and lower the vehicle.
ADJUSTMENTS
Ring and pinion gears are supplied as matched
sets. Compensation for pinion depth variance is
achieved with a select shim. The shim is located
between the rear pinion bearing and the pinion gear
head.
PINION DEPTH MEASUREMENT AND ADJUSTMENT
Measurements are taken with pinion bearing cups
and pinion bearings installed in the housing. Take
measurements with Pinion Gauge Set and Dial Indi-
cator C-3339 (Fig. 3).
(1) Assemble Pinion Height Block 6739, Pinion
Block 8899 and rear pinion bearing onto Screw 6741
(Fig. 3).
(2) Insert assembled height gauge components,
rear bearing and screw into the housing through pin-
ion bearing cups (Fig. 4).
(3) Install front pinion bearing and Cone-nut 6740
onto the screw. Tighten cone-nut until Torque To
Rotate the screw is 1.7-2.26 N´m (15-20 in. lbs.) (Fig.
3).
(4) Place Arbor Disc 6732 on Arbor D-115-3 in posi-
tion in the housing side bearing cradles (Fig. 5).
(5) Install differential bearing caps on arbor discs
and snug the bearing cap bolts. Then cross tighten
cap bolts to 165 N´m (122 ft. lbs.).
NOTE: Arbor should rotate freely in the arbor discs.
(6) Assemble Dial Indicator C-3339 into Scooter
Block D-115-2 and secure set screw.
(7) Position Scooter Block/Dial Indicator flush on
the pinion height block. Hold scooter block and zero
the dial indicator.
(8) Slowly slide the scooter block across the pinion
height block over to the arbor (Fig. 6). Move the
scooter block till dial indicator crests the arbor, then
record the highest reading.
(9) Select a shim equal to the dial indicator read-
ing.(10) Install the select shim between the rear pin-
ion bearing and the pinion gear head.
Fig. 3 PINION GEAR DEPTH GAUGE TOOLS
1 - DIAL INDICATOR
2 - ARBOR
3 - PINION HEIGHT BLOCK
4 - CONE
5 - SCREW
6 - PINION BLOCK
7 - SCOOTER BLOCK
8 - ARBOR DISC
Fig. 4 PINION HEIGHT BLOCK
1 - PINION BLOCK
2 - PINION HEIGHT BLOCK
3 - 116 REAR AXLE - 10 1/2 AADR
REAR AXLE - 10 1/2 AA (Continued)

DIFFERENTIAL CASE BEARING PRELOAD AND
GEAR BACKLASH
Backlash is adjusted by moving the adjusters in
and out or both. By moving the adjusters the case/
ring gear will move closer or further away from the
pinion. In most cases this adjustment can be used to
achieve the correct gear tooth pattern and set the
case bearing preload.
(1) Remove adjuster lock bolts and adjuster locks
(Fig. 7).
(2) Loosen the differential bearing caps.
(3) Slide differential case toward the pinion gear
until the gears make contact/zero backlash. If zerobacklash cannot be obtained, turn the pinion side
adjuster until zero backlash is obtained.
(4) Holding the differential case toward the pinion
gear, turn bearing adjusters with Spanner Wrench
8883 (Fig. 8) until they make contact with the differ-
ential bearings/cups.
(5) Back off the ring gear side adjuster 4 holes, to
obtain initial ring gear backlash.
Fig. 5 GAUGE TOOLS IN HOUSING
1 - ARBOR DISC
2 - PINION BLOCK
3 - ARBOR
4 - PINION HEIGHT BLOCK
Fig. 6 PINION GEAR DEPTH MEASUREMENT
1 - ARBOR
2 - SCOOTER BLOCK
3 - DIAL INDICATOR
Fig. 7 ADJUSTER LOCK BOLT
1 - DIFFERENTIAL CASE
2 - ADJUSTER LOCK
3 - ADJUSTER LOCK BOLT
4 - BEARING CAP BOLT
Fig. 8 ADJUSTER SPANNER WRENCH
1 - WRENCH
2 - DIFFERENTIAL
DRREAR AXLE - 10 1/2 AA 3 - 117
REAR AXLE - 10 1/2 AA (Continued)

(6) Install ring gear side adjuster lock and bolt. Do
not tighten adjuster lock bolt at this time.
(7) Tighten pinion gear side adjuster firmly
against the differential case bearing cup.
(8) Rotate the pinion several times to seat the def-
erential bearings.
(9) Loosen pinion gear side adjuster until it is no
longer in contact with the bearing cup, then tighten
it until it makes contact.
(10) Tighten pinion gear side adjuster an addi-
tional:
²New Bearings:6 Adjuster Holes
²Original Bearings:4 Adjuster Holes
(11) Install pinion gear side adjuster lock and bolt.
Do not tighten adjuster lock bolt at this time.
(12) Tighten bearing cap bolts to 115 N´m (85 ft.
lbs.).
(13) Tighten adjuster lock bolts to 33 N´m (24 ft.
lbs.).
(14) Measure ring gear backlash with a Dial Indi-
cator C-3339 and Dial Indicator Stud L-4438 at eight
points around the drive side of the ring gear (Fig. 9).
The backlash should be 0.08-0.25 mm (0.003-0.010
in) with a preferred backlash of 0.13-0.18 mm (0.005-
0.007 in).
NOTE: Backlash measurement should not vary
more than 0.05 mm (0.002 in) between measuring
points. If measurement does vary inspect the gears
for burrs, the differential case flange and ring gear
mounting.GEAR TOOTH CONTACT PATTERN
Gear tooth contact pattern is used to verify the cor-
rect running position of the ring and pinion gears.
This will produce low noise and long gear life. Gears
which are not positioned properly may be noisy and
have shorten gear life.
(1) Wipe clean each tooth of the ring gear.
(2) Apply gear marking compound to all of the ring
gear teeth.
(3) Verify bearing cap bolts are torque specifica-
tion.
(4) Apply parking brakes lightly to create at 14
N´m (10 ft. lbs.) pinion rotating torque.
(5) Rotate the pinion/pinion yoke 4 full revolutions
in each directions.
(6) Read gear tooth contact pattern:
²Gear contact pattern correct (Fig. 10). Backlash
and pinion depth is correct.
²Ring gear too far away from pinion gear (Fig.
11). Decrease the backlash, by moving the ring closer
to the pinion gear using the adjusters.
²Ring gear too close to pinion gear (Fig. 12).
Increase the backlash, by moving the ring away from
the pinion gear using the adjusters.
Fig. 9 RING GEAR BACKLASH
1 - DIAL INDICATOR
2 - RING GEAR
Fig. 10 CORRECT CONTACT PATTERN
Fig. 11 INCORRECT BACKLASH
1 - COAST SIDE TOE
2 - DRIVE SIDE HEEL
3 - 118 REAR AXLE - 10 1/2 AADR
REAR AXLE - 10 1/2 AA (Continued)

SPECIFICATIONS
AXLE SPECIFICATIONS
DESCRIPTION SPECIFICATION
Axle Ratio 3.73, 4.10
Ring Gear Diameter 266 mm (10.5 in.)
Ring Gear Backlash 0.13-0.18 mm (0.005-0.007 in.)
Pinion Bearing Preload - New Bearings 1.69-2.82 N´m (15-25 in. lbs.)
Pinion Bearing Preload - Original Bearings 1-2 N´m (10-20 in. lbs.)
Pinion Bearing Preload + Diff Case Bearing Preload -
New Bearings3.4-5.6 N´m (30-50 in. lbs.)
Pinion Bearing Preload + Diff Case Bearing Preload -
Original Bearings2.8-5.1 N´m (25-45 in. lbs.)
TORQUE SPECIFICATIONS
DESCRIPTION N´m Ft. Lbs. In. Lbs.
Fill Hole Plug 32 24 -
Differential Cover Bolts 40 30 -
Bearing Cap Bolts 165 122 -
Ring Gear Bolts 237 175 -
Axle Flange Bolts 129 95 -
Adjuster Lock Bolt 25 18 -
SPECIAL TOOLS
PULLER C-293-PA
DIAL INDICATOR SET C-3339
HANDLE C-4171
3 - 120 REAR AXLE - 10 1/2 AADR
REAR AXLE - 10 1/2 AA (Continued)