DODGE RAM 2002 Service Repair Manual

(11) Apply MopartSilicone Sealer to threads of
rear extension housing bolts. Then install and
tighten bolts to 27-34 N´m (20-25 ft. lbs.) torque.
INSTALLATION
(1) Align and seat transfer case on transmission.
Be sure transfer case input gear splines are aligned
with transmission output shaft. Align splines by
rotating transfer case rear output shaft yoke if nec-
essary. Do not install any transfer case attaching
nuts until the transfer case is completely seated
against the transmission.
(2) Install and tighten transfer case attaching
nuts. Tighten nuts to 30-41 N´m (20-30 ft.lbs.).
(3) Install rear crossmember.(4) Remove jack stand from under transmission.
(5) Align and connect propeller shafts. (Refer to 3 -
DIFFERENTIAL & DRIVELINE/PROPELLER
SHAFT/PROPELLER SHAFT - INSTALLATION)
(6) Connect vacuum harness and vent hose.
(7) Connect shift rod to transfer case lever or floor
shift arm. Use channel lock style pliers to press rod
back into lever grommet.
(8) Adjust shift linkage, if necessary.
(9) Fill transfer case with recommended transmis-
sion fluid and install fill plug.
(10) Install skid plate, if equipped. (Refer to 13 -
FRAMES & BUMPERS/FRAME/TRANSFER CASE
SKID PLATE - INSTALLATION)
(11) Lower vehicle
SPECIFICATIONS
TRANSFER CASE
TORQUE SPECIFICATIONS
DESCRIPTION N-m Ft. Lbs. In. Lbs.
Plug, Detent 16-24 12-18 -
Bolt, Diff. Case 17-27 15-24 -
Plug, Drain/Fill 40-45 30-40 -
Bolt, Extension Housing 35-46 26-34 -
Bolt, Front Brg. Retainer 16-27 12-24 -
Bolt, Case Half 35-46 26-34 -
Nut, Front Yoke 122-176 90-130 -
Screw, Oil Pump 1.2-1.8 - 12-15
Nut, Range Lever 27-34 20-25 -
Bolt, Rear Retainer 35-46 26-34 -
Nuts, Mounting 30-41 20-30 -
Bolts, U-Joint 19 17 -
Vacuum Switch 20-34 15-25 -
21 - 458 TRANSFER CASE - NV241LDBR/BE
TRANSFER CASE - NV241LD (Continued)

SPECIAL TOOLS
TRANSFER CASE - NV241LD
Handle, Universal - C-4171
Installer, Seal - 6888
Installer, Bearing - 6953
Installer, Seal - C-4210
Remover, Bushing - 6957
Installer, Bushing - 8157
Installer, Seal - D-163
Installer, Seal - 7884
Installer, Bushing - 5066
BR/BETRANSFER CASE - NV241LD 21 - 459
TRANSFER CASE - NV241LD (Continued)

EXTENSION HOUSING
BUSHING AND SEAL
REMOVAL
(1) Raise and support vehicle.
(2) Remove rear propeller shaft. (Refer to 3 - DIF-
FERENTIAL & DRIVELINE/PROPELLER SHAFT/
PROPELLER SHAFT - REMOVAL)
(3) Using a suitable pry tool or slide-hammer
mounted screw, remove the extension housing seal.
(4) Using Remover 8158, remove bushing from
extension housing.
INSTALLATION
(1) Clean fluid residue from sealing surface and
inspect for defects.
(2) Position replacement bushing in extension
housing with fluid port in bushing aligned with slot
in housing.
(3) Using Installer 8157, drive bushing into hous-
ing until installer seats against case.
(4) Using Installer D-163, install seal in extension
housing (Fig. 96).
(5) Install propeller shaft. (Refer to 3 - DIFFER-
ENTIAL & DRIVELINE/PROPELLER SHAFT/PRO-
PELLER SHAFT - INSTALLATION)
(6) Verify proper transfer case fluid level.
(7) Lower vehicle.
FLUID
STANDARD PROCEDURE - FLUID DRAIN AND
REFILL
The fill and drain plugs are both in the rear case
(Fig. 97).
(1) Raise vehicle.
(2) Position drain pan under transfer case.
(3) Remove drain and fill plugs and drain lubri-
cant completely.
(4) Install drain plug. Tighten plug to 41-54 N´m
(30-40 ft. lbs.).
(5) Remove drain pan.
(6) Fill transfer case to bottom edge of fill plug
opening with MopartATF +4, type 9602, Automatic
Transmission fluid.
(7) Install and tighten fill plug to 41-54 N´m
(30-40 ft. lbs.).
(8) Lower vehicle.
Plug, Extension - C-293-3
Tool Set - L-4518
Cup - 8148
Installer, Pump Housing Seal - 7888
Fig. 96 Install Rear Seal in Extension Housing
1 - SPECIAL TOOL C-4171
2 - SPECIAL TOOL D-163
21 - 460 TRANSFER CASE - NV241LDBR/BE
TRANSFER CASE - NV241LD (Continued)

FRONT OUTPUT SHAFT SEAL
REMOVAL
(1) Shift transfer case into NEUTRAL.
(2) Raise vehicle.
(3) Remove front propeller shaft. (Refer to 3 - DIF-
FERENTIAL & DRIVELINE/PROPELLER SHAFT/
PROPELLER SHAFT - REMOVAL)
(4) Remove companion flange nut (Fig. 98). Dis-
card nut after removal. It is not reusable.
(5) Remove companion flange from output shaft.
Use a suitable puller if flange can not be removed by
hand.
(6) Remove companion flange rubber seal from
front output shaft (Fig. 99).(7) Remove front output shaft seal with suitable
pry tool, or a slide hammer mounted screw.
INSTALLATION
(1) Install new front output seal in front case with
Installer Tool 6888 and Tool Handle C-4171 (Fig.
100) as follows:
(a) Place new seal on tool. Garter spring on seal
goes toward interior of case.
(b) Start seal in bore. Once seal is started, con-
tinue tapping seal into bore until installer tool bot-
toms against case.
(c) Remove installer and verify that seal is
recessed the proper amount. Seal should be 2.03 to
2.5 mm (0.080 to 0.100 in.) below top edge of seal
bore in front case (Fig. 101). This is correct final
seal position.
CAUTION: Be sure the front output seal is seated
below the top edge of the case bore as shown. The
seal could loosen, or become cocked if not seated
to recommended depth.
Fig. 97 Fill/Drain Plug and I.D. Tag Location -
Typical
1 - I.D. TAG
2 - FILL PLUG
3 - DRAIN PLUG
Fig. 98 Removing Companion Flange Nut
1 - COMPANION FLANGE
2 - 1-1/8º SOCKET
Fig. 99 Companion Flange Seal Removal
1 - FLANGE SEAL
Fig. 100 Front Output Seal Installation
1 - SPECIAL TOOL C-4171
2 - SPECIAL TOOL 6888
BR/BETRANSFER CASE - NV241LD 21 - 461
FLUID (Continued)

(2) Install companion flange seal on front shaft
(Fig. 102).
(3) Install companion flange on front shaft (Fig.
103). Then install and tighten flange nut to 176-271
N´m (130-200 ft. lbs.) torque.
(4) Install propeller shaft. (Refer to 3 - DIFFER-
ENTIAL & DRIVELINE/PROPELLER SHAFT/PRO-
PELLER SHAFT - INSTALLATION)SHIFT LEVER
REMOVAL
(1) Shift transfer case into 2H.
(2) Remove transfer case shifter knob cap.
(3) Remove nut holding shifter knob to shift lever.
(4) Remove shifter knob.
(5) Remove the shift boot from the shifter bezel.
(6) Remove the bolts securing the shifter mecha-
nism to the floor pan along the driver's side of the
transmission tunnel (Fig. 104).
(7) Raise and support the vehicle.
(8) Loosen adjusting trunnion lock bolt and slide
shift rod out of trunnion. If rod lacks enough travel
to come out of trunnion, push trunnion out of shift
lever.
(9) Remove the nuts holding the shifter mecha-
nism to the underside of the floor pan.
(10) Separate shift lever mechanism from the vehi-
cle.
INSTALLATION
(1) If the shifter mechanism does not have a
adjustment locating pin installed, align the adjust-
ment channel on the shifter assembly to the locating
hole in the lower shift lever and install an appropri-
ately sized pin to retain the position (Fig. 105).
(2) Position shift lever on vehicle.
(3) Install nuts to hold shift lever to the underside
of the body.
(4) Install trunnion to shift lever, if necessary.
(5) Install shift rod to trunnion, if necessary.
(6) Tighten the shift rod lock bolt to 10 N´m (90
in.lbs.).
Fig. 101 Checking Front Output Seal Installation
Depth
1 - CORRECT SEAL DEPTH IS 2.03-2.5 mm (0.080-0.100 in.)
BELOW TOP EDGE OF BORE
2 - FRONT CASE SHAFT BORE
3 - FRONT OUTPUT SEAL
Fig. 102 Installing Flange Seal On Front Shaft
1 - FRONT OUTPUT SHAFT
2 - FLANGE SEAL
Fig. 103 Installing Companion Flange On Front
Shaft
1 - COMPANION FLANGE
21 - 462 TRANSFER CASE - NV241LDBR/BE
FRONT OUTPUT SHAFT SEAL (Continued)

(7) Remove the shifter adjustment locating pin
from the adjustment channel and the locating hole.
(8) Lower vehicle.(9) Install the bolts to hold the shifter mechanism
to the floor pan.
(10) Install the transfer case shifter bezel.
(11) Install the shifter boot and the shifter knob
onto the shifter lever.
(12) Install nut to hold shifter knob to shift lever.
(13) Install shifter knob cap.
(14) Verify transfer case operation.
ADJUSTMENTS
ADJUSTMENT - SHIFT LEVER
(1) Move shift lever into 2H position.
(2) Raise vehicle.
(3) Loosen shift rod lock bolt at trunnion (Fig.
106).
(4) Check shift rod fit in trunnion. Be sure rod
does not bind in trunnion. Lubricate the shift rod
and trunnion if necessary.
Fig. 104 Transfer Case Shifter
1 - TRANSFER CASE SHIFTER ASSEMBLY
2 - SHIFT ROD
3 - TRUNNION
4 - LOCK BOLT
Fig. 105 Shifter Adjustment
1 - LOCATING PIN
2 - ADJUSTMENT CHANNEL
3 - LOWER SHIFTER LEVER
4 - LOCATING HOLE
Fig. 106 Shift Rod Lock Bolt Location
1 - TRANSFER CASE SHIFTER ASSEMBLY
2 - SHIFT ROD
3 - TRUNNION
4 - LOCK BOLT
BR/BETRANSFER CASE - NV241LD 21 - 463
SHIFT LEVER (Continued)

(5) Verify that transfer case shift lever is in 2H
detent position. The 2H detent position on the trans-
fer case shift arm is the second position from full for-
ward.
(6) Align the adjustment locating hole on the lower
shifter lever with the adjustment channel on the
shifter bracket assembly (Fig. 107).
(7) Insert an appropriately sized pin through into
the adjustment channel and through the locating
hole to hold the shifter in the correct position.
(8) Tighten shift rod lock bolt to 10 N´m (90 in.
lbs.) torque.
(9) Remove the locating pin from the adjustment
channel and locating hole.
(10) Check shift linkage operation. Be sure trans-
fer case shifts into and operates properly in all
ranges.
Fig. 107 Shifter Adjustment Location
1 - LOCATING PIN
2 - ADJUSTMENT CHANNEL
3 - LOWER SHIFTER LEVER
4 - LOCATING HOLE
21 - 464 TRANSFER CASE - NV241LDBR/BE
SHIFT LEVER (Continued)

TRANSFER CASE - NV241HD
TABLE OF CONTENTS
page page
TRANSFER CASE - NV241HD
DESCRIPTION........................465
OPERATION..........................467
DIAGNOSIS AND TESTING - TRANSFER
CASE..............................467
REMOVAL............................469
DISASSEMBLY........................469
CLEANING...........................476
INSPECTION.........................476
ASSEMBLY...........................480
INSTALLATION........................494
SPECIFICATIONS
TRANSFER CASE....................495
SPECIAL TOOLS
TRANSFER CASE - NV241HD...........495EXTENSION HOUSING BUSHING AND SEAL
REMOVAL............................497
INSTALLATION........................497
FLUID
STANDARD PROCEDURE - FLUID DRAIN/
REFILL............................497
FRONT OUTPUT SHAFT SEAL
REMOVAL............................498
INSTALLATION........................498
SHIFT LEVER
REMOVAL............................499
INSTALLATION........................500
ADJUSTMENTS
ADJUSTMENT - SHIFT LEVER..........500
TRANSFER CASE - NV241HD
DESCRIPTION
The NV241HD is a part-time transfer case with a
low-range gear system. The transfer case provides
three operating ranges plus a NEUTRAL position.
The low range position provides a gear reduction
ratio of 2.72:1 for increased low speed torque capabil-
ity. Operating ranges are: 2H, 4H, and 4LO.
The synchronizer mechanism consists of a brass
stop ring, synchronizer hub, and the sliding clutch
(Fig. 1). The synchronizer components allow the
transfer case to be shifted between the 2H and 4H
operating ranges while the vehicle is in motion.The gear cases, retainer and extension are all of
aluminum. Drive sprockets and an interconnecting
drive chain are used to transmit engine torque to the
front/rear propeller shafts. The mainshaft, input gear
and front output shaft are supported by ball and nee-
dle bearings.
PTO CAPABILITY
The NV241HD transfer case has power take-off
capability. A PTO gear permanently attached to the
planetary carrier, and a removable PTO cover are
provided for this purpose.
BR/BETRANSFER CASE - NV241HD 21 - 465

Fig. 1 NV241HD Transfer Case
21 - 466 TRANSFER CASE - NV241HDBR/BE
TRANSFER CASE - NV241HD (Continued)

IDENTIFICATION
An identification tag (Fig. 2) is attached to the rear
case of every transfer case. The tag provides the
transfer case model number, assembly number, serial
number, and low range ratio.
The transfer case serial number also represents
the date of build.
OPERATION
OPERATING RANGES
Transfer case operating ranges are:
²2H (2-wheel drive)
²4H (4-wheel drive)
²4LO (4-wheel drive low range)
The 2H range is for use on any road surface at any
time.
The 4H and 4LO ranges are for off road use only.
They are not for use on hard surface roads. The onlyexception being when the road surface is covered by
ice and snow or other loose, slippery material.
The low range reduction gear system is operative
in 4LO range only. This range is for extra pulling
power in off road situations. Low range reduction
ratio is 2.72:1.
A front axle disconnect system is used to achieve
two-wheel drive mode. The axle disconnect vacuum
motor is actuated by a vacuum switch on the transfer
case. The switch is operated by the transfer case
range rod.
SHIFT MECHANISM
The transfer case is operated by an adjustable floor
mounted shift linkage. The transfer case shift lever
is directly attached to the shift sector. The sector
operates the range and mode forks within the trans-
fer case.
A straight line shift pattern is used with a NEU-
TRAL detent. Lever range positions are imprinted in
the shift knob.
SHIFTING
The synchronizer components allow the transfer
case to be shifted between the 2H and 4H operating
ranges while the vehicle is in motion. The vehicle
must have the transmission placed in NEUTRAL, or
the clutch depressed in the case of a manual trans-
mission, and be moving less than 2-3 MPH when
shifting into the 4L operating range.
DIAGNOSIS AND TESTING - TRANSFER CASE
Before beginning repair on a suspected transfer
case malfunction, check all other driveline compo-
nents beforehand.
The actual cause of a problem may be related to
such items as: front hubs, axles, propeller shafts,
wheels and tires, transmission, or clutch instead. If
all other driveline components are in good condition
and operating properly, refer to the Diagnosis Chart
for further information.
1 - FRONT CASE 16 - NEEDLE BEARING
2 - PLANETARY ASSEMBLY 17 - FRONT OUTPUT SHAFT
3 - SUPPORT SLEEVE 18 - SPROCKET
4 - SYNCHRO HUB 19 - ROLLER BEARING
5 - STOP RING 20 - SEAL
6 - REAR CASE 21 - COMPANION FLANGE
7 - OIL PUMP 22 - SECTOR SHAFT
8 - REAR RETAINER 23 - SLIDING CLUTCH
9 - OUTPUT BEARING 24 - SLIDING HUB
10 - REAR EXTENSION 25 - PTO GEAR
11 - SEAL 26 - ANNULUS GEAR
12 - BUSHING 27 - INPUT BEARING RETAINER
13 - SPEEDOMETER GEAR 28 - SEAL
14 - DRIVE SPROCKET 29 - INPUT GEAR
15 - CHAIN 30 - INPUT BEARING
Fig. 2 Transfer Case Identification Tag - Typical
1 - I.D. TAG
2 - FILL PLUG
3 - DRAIN PLUG
BR/BETRANSFER CASE - NV241HD 21 - 467
TRANSFER CASE - NV241HD (Continued)