Dodge RAM 1500 1998 Owner's Manual page 2185

21 - 482 TRANSFER CASE - NV243
TRANSFER CASE - NV243
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 482
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 483
DIAGNOSIS AND TESTING - TRANSFER
CASE - NV243 . . . . . . . . . . . . . . . . . . . . . . . 483
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 484
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . 484
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . 493
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . 493
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . 496
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 505
SPECIFICATIONS
TRANSFER CASE - NV243
SPECIAL TOOLS
TRANSFER CASE - NV243
EXTENSION HOUSING SEAL
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 507
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
. . . . . . . . . . . . . 505
. . . . . . . . . . . . . 506
FLUID
STANDARD PROCEDURE - FLUID DRAIN AND
REFILL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507
FRONT OUTPUT SHAFT SEAL
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 508
MODE SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 509
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 509
SELECTOR SWITCH
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 510
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 510
SHIFT MOTOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 511
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 511
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 511
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