Dodge dakota 2002 Service Manual page 2497

21 - 658 TRANSFER CASE - NV243
TRANSFER CASE - NV243
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 658
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 659
DIAGNOSIS AND TESTING - TRANSFER
CASE - NV243 . . . . . . . . . . . . . . . . . . . . . . . 659
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 660
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . 660
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . 668
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . 668
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . 670
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 679
SPECIFICATIONS
TRANSFER CASE - NV243
SPECIAL TOOLS
TRANSFER CASE - NV241/NV243 . . . . . . . . 680
EXTENSION HOUSING BUSHING AND SEAL
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 682
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 682
TRANSFER CASE - NV243
DESCRIPTION
The NV243 is an electronically controlled part-time
transfer case with a low range gear reduction system.
The NV243 has three operating ranges plus a NEU-
TRAL position. The low range system provides a gear
reduction ratio for increased low speed torque capa-
bility.
The geartrain is mounted in two aluminum case
halves attached with bolts. The mainshaft front and
rear bearings are mounted in aluminum retainer
housings bolted to the case halves.
OPERATING RANGES
Transfer case operating ranges are:
• 2WD (2-wheel drive)
• 4HI (4-wheel drive)
• 4LO (4-wheel drive low range)
• NEUTRAL
The 2WD range is for use on any road surface at
any time.
TRANSFER CASE - NV243
TABLE OF CONTENTS
page
. . . . . . . . . . . . . 680
FLUID
STANDARD PROCEDURE - FLUID DRAIN AND
REFILL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 682
FRONT OUTPUT SHAFT SEAL
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 683
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 683
MODE SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 684
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 684
SELECTOR SWITCH
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 685
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 685
SHIFT MOTOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 686
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 686
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 686
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 686
The 4HI and 4LO ranges are for off road use only.
They are not for use on hard surface roads. The only
exception being when the road surface is wet or slip-
pery or covered by ice and snow.
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.
SHIFT MECHANISM
Operating ranges
mounted shift selector switch. The shift selector
switch provides a input to the Transfer Case Control
Module (TCCM) to indicate the driver's desire to
change operating ranges. The TCCM uses this input,
along with input from the transfer case mounted
mode sensor and information from the vehicle's bus,
to determine if a shift is permitted. If the TCCM
decides the shift is permitted, the TCCM controls the
shift motor, mounted to the exterior of the transfer
case, to perform the shift.
are selected with
DR
page
a dash