2003 JEEP GRAND CHEROKEE prop shaft

(6) Remove the U-joint strap bolts at the pinion
shaft yoke (Fig. 10).
(7) Remove bolts holding rear universal joint to
the transfer case yoke.
(8) Separate the rear universal joint from the
transfer case yoke.
(9) Push rear of propeller shaft upward to clear
transfer case yoke.
(10) Separate front universal joint from front axle.
(11) Separate propeller shaft from vehicle.
INSTALLATION
(1) Position front propeller shaft under vehicle
with rear universal joint over the transfer case yoke.
(2) Place front universal joint into the axle pinion
yoke.
(3) Align mark on the rear link yoke and universal
joint to the mark on the transfer case yoke.
(4) Loosely install bolts to hold universal joint to
transfer case yoke.
(5) Align mark on front universal joint to the mark
on the axle pinion yoke.
(6) Tighten the U-joint strap/clamp bolts at the
axle yoke to 19 N´m (14 ft. lbs.).
(7) Tighten the universal joint to transfer case
bolts to 27 N´m (20 ft. lbs.).
(8) Lower the vehicle.
PROPELLER SHAFT - REAR
REMOVAL
(1) Raise and support vehicle on safety stands.
(2) Shift the transmission and transfer case if nec-
essary, to their neutral positions.
(3) Mark a line across the axle pinion yoke and the
propeller shaft yoke for installation reference.
(4) Remove the bolts holding the universal joint
clamps to the pinion yoke.
(5) Slide the slip yoke off of the transmission, or
transfer case, output shaft and remove the propeller
shaft (Fig. 11).
INSTALLATION
(1) Slide the slip yoke on the transmission, or
transfer case, output shaft.
(2) Align the installation reference marks made on
the propeller shaft and pinion yoke.
(3) Position universal joint into pinion yoke.
(4) Install the universal joint clamp and clamp
bolts to the pinion yoke. Tighten bolts to 19 N´m (14
ft. lbs.).
(5) Lower the vehicle.
Fig. 10 FRONT PROPELLER SHAFT - 4.7L
1 - FRONT AXLE
2 - BOOT
3 - PROPELLER SHAFT
4 - DOUBLE CARDAN U-JOINT
5 - TRANSFER CASE
6 - BOOT
7 - SLINGER
8 - CLAMP
9 - YOKE
Fig. 11 REAR PROPELLER SHAFT
1 - SLIDING YOKE
2 - PROPELLER SHAFT
3 - PINION YOKE
4 - CLAMP/STRAP
5 - BOLT
6 - OUTPUT SHAFT
WJPROPELLER SHAFT 3 - 7
PROPELLER SHAFT - FRONT 4.7L (Continued)

SINGLE CARDAN UNIVERSAL
JOINTS
DISASSEMBLY
NOTE: Individual components of cardan universal
joints are not serviceable. If worn or leaking, they
must be replaced as an assembly.
(1) Remove the propeller shaft.
(2) Tap the outside of the bearing cap assembly
with a drift to loosen snap ring.
(3) Remove snap rings from both sides of yoke
(Fig. 12).
(4) Set the yoke in an arbor press or vise with a
socket whose inside diameter is large enough to
receive the bearing cap positioned beneath the yoke.
(5) Position the yoke with the grease fitting, if
equipped, pointing up.
(6) Place a socket with an outside diameter
smaller than the upper bearing cap on the upper
bearing cap and press the cap through the yoke to
release the lower bearing cap (Fig. 13).
(7) If the bearing cap will not pull out of the yoke
by hand after pressing, tap the yoke ear near the
bearing cap to dislodge the cap.
(8) To remove the opposite bearing cap, turn the
yoke over and straighten the cross in the open hole.
Then, carefully press the end of the cross until the
remaining bearing cap can be removed (Fig. 14).
CAUTION: If the cross or bearing cap are not
straight during installation, the bearing cap willscore the walls of the yoke bore and damage can
occur.
Fig. 12 REMOVE SNAP RING
1 - SNAP RING
Fig. 13 PRESS OUT BEARING
1 - PRESS
2 - SOCKET
Fig. 14 PRESS OUT REMAINING BEARING
1 - CROSS
2 - BEARING CAP
3 - 8 PROPELLER SHAFTWJ

ASSEMBLY
(1) Apply extreme pressure (EP) N.L.G.I. Grade 1
or 2 grease to inside of yoke bores.
(2) Position the cross in the yoke with its lube fit-
ting, if equipped, pointing up (Fig. 15).
(3) Place a bearing cap over the trunnion and
align the cap with the yoke bore (Fig. 16). Keep the
needle bearings upright in the bearing cap.
(4) Press the bearing cap into the yoke bore
enough to clear snap ring groove.
(5) Install a snap ring.
(6) Repeat Step 3 and Step 4 to install the oppo-
site bearing cap.
NOTE: If the joint is stiff or binding, strike the yoke
with a soft hammer to seat the needle bearings.
(7) Add grease to lube fitting, if equipped.
(8) Install the propeller shaft.
DOUBLE CARDAN UNIVERSAL
JOINTS
DISASSEMBLY
NOTE: Individual components of cardan universal
joints are not serviceable they must be replaced as
an assembly.(1) Remove the propeller shaft.
(2) Mark the propeller shaft yoke and link yoke for
assembly reference.
(3) Tap the outside of the bearing cap assembly
with drift to loosen snap rings.
(4) Remove all the bearing cap snap rings (Fig.
17).
Fig. 15 CROSS IN YOKE
1 - CROSS
2 - YOKE
Fig. 16 INSTALL BEARING ON TRUNNION
1 - BEARING CAP
2 - TRUNNION
Fig. 17 SNAP RINGS
WJPROPELLER SHAFT 3 - 9
SINGLE CARDAN UNIVERSAL JOINTS (Continued)

(5) Remove any grease fittings if equipped.
(6) Position a socket on the press with an inside
diameter large enough to receive the bearing cap
under the link yoke.
(7)
Place another socket with an outside diameter
smaller than the bearing cap on the upper bearing cap.
(8) Press one bearing cap from the outboard side of
the link yoke enough to grasp the cap with vise jaws
(Fig. 18).
(9) Grasp protruding bearing cap with vise jaws
and tap link yoke with a mallet and drift to remove
bearing cap (Fig. 19).(10) Flip assembly and repeat Step 6, Step 7, Step
8 and Step 9 to remove the opposite bearing cap.
(11) Remove the cross centering kit assembly and
spring (Fig. 20).
(12) Press the remaining bearing caps out the
other end of the link yoke as described above to com-
plete the disassembly.
ASSEMBLY
CAUTION: All alignment marks on the link yoke and
propeller shaft yoke must be aligned during assem-
bled.
(1) Apply extreme pressure (EP) N.L.G.I. Grade 1
or 2 grease to inside of yoke bores.
(2)
Fit a cross into the propeller shaft yoke (Fig. 21).
Fig. 18 PRESS OUT BEARING
Fig. 19 REMOVE BEARING FROM YOKE
Fig. 20 REMOVE CENTERING KIT
Fig. 21 INSTALL CROSS IN YOKE
3 - 10 PROPELLER SHAFTWJ
DOUBLE CARDAN UNIVERSAL JOINTS (Continued)

(3) Place a bearing cap over the trunnion and
align the cap with the yoke bore (Fig. 22). Keep nee-
dle bearings upright in the bearing cap.
(4) Press bearing cap into the yoke bore enough to
clear snap ring groove (Fig. 23).
(5) Install a snap ring.(6) Flip propeller shaft yoke and install other bear-
ing cap onto the opposite trunnion and install a snap
ring (Fig. 24).
(7) Fit the link yoke onto the remaining trunnions
and press both bearing caps into place and install
snap rings (Fig. 25).
Fig. 22 INSTALL BEARING CAP
Fig. 23 PRESS BEARING CAP
Fig. 24 PRESS BEARING CAP
Fig. 25 INSTALL LINK YOKE
WJPROPELLER SHAFT 3 - 11
DOUBLE CARDAN UNIVERSAL JOINTS (Continued)

(8) Install centering kit assembly inside the link
yoke (Fig. 26).
NOTE: Making sure the spring is properly posi-
tioned.
(9) Place two bearing caps on opposite trunnions of
the remaining cross. Fit the open trunnions into the
link yoke bores and the bearing caps into the center-
ing kit (Fig. 27).(10) Press the remaining two bearing caps into
place and install snap rings (Fig. 28).
(11) Tap the snap rings to seat them into the
grooves (Fig. 29).
Fig. 26 CENTERING KIT
Fig. 27 REMAINING CROSS
Fig. 28 PRESS BEARING CAP
Fig. 29 SEAT SNAP RINGS
3 - 12 PROPELLER SHAFTWJ
DOUBLE CARDAN UNIVERSAL JOINTS (Continued)

(12) Verify for proper assembly. Flexing the joint
beyond center, the joint should snap over-center in
both directions if correctly assembled (Fig. 30).
(13) Install the propeller shaft.
Fig. 30 VERIFY ASSEMBLY
WJPROPELLER SHAFT 3 - 13
DOUBLE CARDAN UNIVERSAL JOINTS (Continued)

FRONT AXLE - 186FBI
TABLE OF CONTENTS
page page
FRONT AXLE - 186FBI
DESCRIPTION.........................15
OPERATION...........................15
DIAGNOSIS AND TESTING................16
REMOVAL.............................20
INSTALLATION.........................21
ADJUSTMENTS........................21
SPECIFICATIONS.......................30
SPECIAL TOOLS.......................31
AXLE SHAFTS
REMOVAL.............................34
INSTALLATION.........................34
AXLE SHAFT SEALS
REMOVAL.............................35
INSTALLATION.........................35
AXLE - C/V JOINT
REMOVAL.............................35
INSTALLATION.........................35
AXLE - U-JOINT
REMOVAL.............................36INSTALLATION.........................37
PINION SEAL
REMOVAL.............................37
INSTALLATION.........................37
COLLAPSIBLE SPACER
REMOVAL.............................39
INSTALLATION.........................39
DIFFERENTIAL
REMOVAL.............................40
DISASSEMBLY.........................42
ASSEMBLY............................42
INSTALLATION.........................43
DIFFERENTIAL CASE BEARINGS
REMOVAL.............................44
INSTALLATION.........................44
PINION GEAR/RING GEAR
REMOVAL.............................45
INSTALLATION.........................46
FRONT AXLE - 186FBI
DESCRIPTION
The Front Beam-design Iron (FBI) axle consists of
a cast iron differential housing with axle shaft tubes
extending from either side. The tubes are pressed
into the differential housing and welded. The axles
are semi-floating axle shafts, meaning the loads are
supported by the hub bearings. The axle shafts are
retained by nuts at the hub bearings.
The differential case is a one-piece design. Differ-
ential bearing preload and ring gear backlash is
adjusted by the use of shims located between the dif-
ferential bearing cups and housing. Pinion bearing
preload is set and maintained by the use of a collaps-
ible spacer. A differential cover provides a means for
inspection and servicing.
An optional Vari-Loktdifferential has a one-piece
differential case which contains the gerotor pump
assembly and the clutch mechinism. This unit is ser-
viced as an assembly.
OPERATION
The axle receives power from the transfer case
through the front propeller shaft. The front propeller
shaft is connected to the pinion gear which rotatesthe differential through the gear mesh with the ring
gear bolted to the differential case. The engine power
is transmitted to the axle shafts through the pinion
mate and side gears. The side gears are splined to
the axle shafts.
STANDARD DIFFERENTIAL
During straight-ahead driving, the differential pinion
gears do not rotate on the pinion mate shaft. This
occurs because input torque applied to the gears is
divided and distributed equally between the two side
gears. As a result, the pinion gears revolve with the pin-
ion mate shaft but do not rotate around it (Fig. 1).
When turning corners, the outside wheel must
travel a greater distance than the inside wheel to
complete a turn. The difference must be compensated
for to prevent the tires from scuffing and skidding
through turns. To accomplish this, the differential
allows the axle shafts to turn at unequal speeds (Fig.
2). In this instance, the input torque applied to the
pinion gears is not divided equally. The pinion gears
now rotate around the pinion mate shaft in opposite
directions. This allows the side gear and axle shaft
attached to the outside wheel to rotate at a faster
speed.
WJFRONT AXLE - 186FBI 3 - 15