Page 2977 of 4284
INPUT SHAFT COVER SEAL
REMOVAL
The power transfer unit input shaft cover seal is
the larger of the two seals located on the inside of
the end cover. The differential bearing cup must be
removed to service this seal.
(1) Remove P.T.U. end cover bolts (Fig. 30).
(2) Gently tap on end cover ears to separate cover
from case (Fig. 31).
(3) Use special tool No. 6514 and remove the dif-
ferential bearing race located in the end cover (Fig.
32). The race must be removed to gain access to the
seal.
(4) Use special tool No. 7794-A to remove seal (Fig.
33).
Fig. 27 Seal Removal
1 - END COVER
2 - END COVER SEAL
3 - AXLE SHAFT SEAL
Fig. 28 Seal Installation
1 - END COVER
2 - SOCKET
3 - HAMMER
Fig. 29 Bolt Tightening Sequence
RSPOWER TRANSFER UNIT21-13
HALF SHAFT INNER SEAL (Continued)
Page 2978 of 4284
INSTALLATION
The power transfer unit input shaft cover seal is
the larger of the two seals located on the inside of
the end cover. The differential bearing cup must be
removed to service this seal.
(1) Clean and inspect seal area.
(2) Use special tool No. MD998803 and install seal
(Fig. 34). When installing seal the spring side of the
seal must face toward the special tool.
(3) Reinstall the original bearing race and shim
using special tool No. 6522 (Fig. 35) and (Fig. 36).
Fig. 30 P.T.U. End Cover Bolts
1 - POWER TRANSFER UNIT
2 - FILL PLUG
3 - END COVER
4 - OUTPUT SHAFT
Fig. 31 End Cover Removal
1 - END COVER EARS
2 - HAMMER
3 - POWER TRANSFER UNIT
Fig. 32 Bearing Race Removal
1 - END COVER
2 - SPECIAL TOOL No. 6514
Fig. 33 Seal Removal
1 - END COVER
2 - SPECIAL TOOL 7794±A
3 - SLIDE HAMMER
4 - SOFT JAW VICE
21 - 14 POWER TRANSFER UNITRS
INPUT SHAFT COVER SEAL (Continued)
Page 2979 of 4284
CAUTION: The original shim must be installed
behind the bearing cup to maintain proper bearing
preload.
(4) Apply Moparž Gasket Maker, Loctite Gasket
Eliminator No. 518 or equivalent to sealing surfaces
of end cover.
(5) Place end cover onto P.T.U. case and install
bolts. Tighten bolts to 28 N´m (250 in. lbs.) in thesequence shown in (Fig. 37). Retighten first bolt after
all others are tight.
CAUTION: When end cover is installed be careful
not to damage the P.T.U. Input Shaft Cover Seal.
(6) Reinstall P.T.U. assembly into vehicle.
(7) Check and fill fluids as required.
Fig. 34 Seal Installation
1 - SPECIAL TOOL No. MD998803
2 - HAMMER
3 - END COVER
Fig. 35 Bearing Shim and Race
1 - SHIM
2 - BEARING RACE
3 - END COVER
Fig. 36 Installing Bearing Race
1 - HAMMER
2 - END COVER
3 - SPECIAL TOOL No. 6522
4 - HANDLE 4171
Fig. 37 Bolt Tightening Sequence
RSPOWER TRANSFER UNIT21-15
INPUT SHAFT COVER SEAL (Continued)
Page 2980 of 4284

INPUT SHAFT END SEAL
REMOVAL
The input shaft end seal is located on the end of
the input shaft.
(1) Remove power transfer unit from the vehicle.
(2) Remove end cover bolts (Fig. 38).
(3) Tap on end cover ears to separate end cover
from case (Fig. 39).
(4) Pry out seal with a pry bar (Fig. 40).
INSTALLATION
The input shaft end seal is located on the end of
the input shaft.
(1) Clean and inspect seal area.
(2) Remove input shaft from housing and stand on
soft block of wood. Install input shaft end seal with
seal installer 5065 and handle C-4171.
(3) Lubricate seal lip after installing seal into
input shaft.
(4) Clean sealing surfaces of the end cover and
P.T.U. case. Apply a bead of Moparž Gasket Maker,
Loctite Gasket Eliminator No. 518 or equivalent.
Fig. 38 End Cover Bolts
1 - POWER TRANSFER UNIT
2 - FILL PLUG
3 - END COVER
4 - OUTPUT SHAFT
Fig. 39 Side Cover Removal
1 - END COVER EARS
2 - HAMMER
3 - POWER TRANSFER UNIT
Fig. 40 Seal Removal
1 - POWER TRANSFER UNIT
2 - PRYBAR
3 - SEAL
21 - 16 POWER TRANSFER UNITRS
Page 2981 of 4284

(5) Place end cover onto P.T.U. case and install
bolts. Tighten bolts to 28 N´m (250 in. lbs.) in the
sequence shown in (Fig. 41). Retighten first bolt after
all others are tight.
CAUTION: When end cover is installed be careful
not to damage the P.T.U. Input Shaft Cover Seal.
(6) Reinstall P.T.U. assembly.
(7) Check and fill fluids as required.
INPUT SHAFT SEAL
REMOVAL
The Power Transfer Unit must be removed from
the vehicle to service this seal. Refer to Power Trans-
fer Unit Removal in this section for procedures.
(1) Remove P.T.U. end cover bolts (Fig. 42).
(2) Gently tap on end cover ears to separate cover
from case (Fig. 43).
(3) Remove ring gear oil trough (Fig. 44).
(4) Remove input shaft and ring gear from case
(Fig. 45).
(5) Use Special Tool No. 7794-A (seal puller) to
remove seal (Fig. 46).
Fig. 41 Bolt Tightening Sequence
Fig. 42 P.T.U. End Cover Bolts
1 - POWER TRANSFER UNIT
2 - FILL PLUG
3 - END COVER
4 - OUTPUT SHAFT
Fig. 43 End Cover Removal
1 - END COVER EARS
2 - HAMMER
3 - POWER TRANSFER UNIT
RSPOWER TRANSFER UNIT21-17
INPUT SHAFT END SEAL (Continued)
Page 2982 of 4284

INSTALLATION
The Power Transfer Unit must be removed from
the vehicle to service this seal. Refer to Power Trans-
fer Unit Removal in this section for procedures.(1) Clean and inspect seal area.
(2) Lay housing on bench and install new seal with
seal driver C-4657 and handle C-4171 (Fig. 47). The
seal must be installed with the spring side facing
towards the ring gear. Drive the seal in until it bot-
toms against the case shoulder.
(3) Install input shaft.
(4) Install oil trough.
(5) Apply Moparž Gasket Maker or equivalent to
sealing surfaces of end cover and reinstall. Tighten
bolts to 28 N´m (250 in. lbs.)
CAUTION: When end cover is installed be careful
not to damage the P.T.U. Input Shaft Cover Seal.
(6) Reinstall P.T.U. assembly into vehicle.
(7) Check and fill fluids as required.
OUTER HALF SHAFT SEAL
REMOVAL
The outer half shaft seal is located on the outside
of the end cover. The P.T.U. does not have to be
removed to replace this seal.
(1) Lift vehicle on hoist.
(2) Remove right front half shaft from vehicle.
(3) Remove seal with a chisel and hammer (Fig.
48).
Fig. 44 Oil Trough
1 - OIL TROUGH
2 - POWER TRANSFER UNIT
Fig. 45 Input Shaft and Ring Gear Removal
1 - POWER TRANSFER UNIT
2 - RING GEAR
Fig. 46 Seal Removal
1 - POWER TRANSFER UNIT
2 - SPECIAL TOOL
7794±A
21 - 18 POWER TRANSFER UNITRS
INPUT SHAFT SEAL (Continued)
Page 2983 of 4284
INSTALLATION
The outer half shaft seal is located on the outside
of the end cover. The P.T.U. does not have to be
removed to replace this seal.
(1) Clean and inspect seal area.
(2) Install new seal with seal installer MD998334
(Fig. 49).
(3) Reinstall right front half shaft.
(4) Check and fill fluids as required.
Fig. 47 Seal Installation
1 - HAMMER
2 - SPECIAL TOOL C-4171
3 - SPECIAL TOOL C-4657
4 - POWER TRANSFER UNIT
Fig. 48 Seal Removal
1 - HAMMER
2 - CHISEL
3 - SEAL
4 - POWER TRANSFER UNIT
Fig. 49 Seal Installation
1 - BEARING
2 - SNAP RING PLIERS
3 - BEARING SNAP RING
RSPOWER TRANSFER UNIT21-19
OUTER HALF SHAFT SEAL (Continued)
Page 2984 of 4284
REAR COVER O-RING
REMOVAL
(1) Raise vehicle on hoist.
(2) Remove rear cover retaining bolts (Fig. 50).
(3) Index rear cover to the case for later reassem-
bly (Fig. 51).(4) Pull rear cover out of the P.T.U. case (Fig. 52).
(5) Remove rear cover O-Ring (Fig. 53).
INSTALLATION
(1) To install, reverse removal procedure.
Fig. 50 Rear Cover Bolts
1 - OUTPUT FLANGE SEAL
2 - REAR COVER
3 - OUTPUT SHAFT
Fig. 51 Mark Rear Cover
1 - REAR COVER
2 - OUTPUT SHAFT
3 - PAINT MARK
Fig. 52 Rear Cover Removal
1 - POWER TRANSFER UNIT ASSEMBLY
2 - REAR COVER
3 - O-RING
Fig. 53 O-Ring Removal
1 - REAR COVER
2 - PINION GEAR
3 - O-RING
21 - 20 POWER TRANSFER UNITRS