Dodge Ram Truck 1500-2500-3500. Manual — part 1873

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 NEUTRAL position. The low range system provides a gear reduction ratio
for increased low speed torque capability.

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.

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 slippery 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 are selected with a dash 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.

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TRANSFER CASE - NV243 - SERVICE INFORMATION

DR/DH

IDENTIFICATION

A circular ID tag (1) is attached to the rear case of
each transfer case. The ID 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

The input gear is splined to the transmission output shaft. The input gear drives the mainshaft through the planetary
assembly and range sleeve. The front output shaft is operated by a drive chain that connects the shaft to a drive
sprocket on the mainshaft. The drive sprocket is engaged/disengaged by the mode fork, which operates the mode
sleeve and hub. The sleeve and hub are not equipped with a synchronizer mechanism for shifting.

DIAGNOSIS AND TESTING - TRANSFER CASE - NV243

DIAGNOSIS CHART

Condition

Possible Cause

Correction

Transfer case difficult to shift or will
not shift into desired range.

1) Transfer case electronically
controlled shift system malfunction.

1) Verify proper operation per the
appropriate diagnostic manual.

2) If vehicle was operated for an
extended period in 4HI mode on dry
surface, driveline torque load may
cause difficulty.

2) Drive the vehicle in a straight line
and momentarily release the
accelerator. The transfer case can
then be shifted to the desired mode.

3) Insufficient or incorrect lubricant.

3) Drain and refill transfer case with
the correct quantity of Mopar

ATF

+4, Automatic Transmission Fluid.

4) Internal transfer case
components binding, worn, or
damaged.

4) Repair or replace components as
necessary.

Transfer case noisy in all drive
modes.

1) Insufficient or incorrect lubricant.

1) Drain and refill transfer case with
the correct quantity of Mopar

ATF

+4, type 9602, Automatic
Transmission Fluid.

2) Internal transfer case
components binding, worn, or
damaged.

2) Repair or replace components as
necessary.

DR/DH

TRANSFER CASE - NV243 - SERVICE INFORMATION

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Dodge Ram Truck 1500-2500-3500. Manual — part 1873

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