The NV271 transfer case (1) is a part-time transfer
case with a low-range gear system. It 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 capability.

The gear cases and extension are all of aluminum.
Drive sprockets and an interconnecting drive chain are
used to transmit engine torque to the front/rear propel-
ler shafts. The mainshaft, input gear and front output
shaft are supported by ball and needle bearings.

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IDENTIFICATION

An identification tag (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 RANGE

Transfer case operating ranges are:

•

2H (2-wheel drive)

•

4H (4-wheel drive)

•

4LO (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 only exception
being when the road surface is 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

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 transfer case.

A straight line shift pattern is used with a NEUTRAL detent. Lever range positions are imprinted in the shift knob.

SHIFTING

The transfer case can be shifted between the 2H and 4H operating ranges while the vehicle is in motion. The vehi-
cle must have the transmission placed in NEUTRAL, or the clutch depressed in the case of a manual transmission,
and be moving less than 2-3 MPH when shifting into and out of the 4L operating range.

DIAGNOSIS AND TESTING - TRANSFER CASE - NV271

Before beginning repair on a suspected transfer case malfunction, check all other driveline components 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.

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TRANSFER CASE - NV271 - SERVICE INFORMATION

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DIAGNOSIS CHART

Condition

Possible Cause

Correction

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

1) Vehicle speed too great to permit
shifting.

1) Stop vehicle and shift into
desired range. Or, reduce speed to
below 3-4 km/h (2-3 mph) before
attempting the shift.

2) If vehicle was operated for an
extended period in 4H on a dry
paved surface, the driveline torque
load may be causing a bind.

2) Stop vehicle and shift the
transmission into neutral. Shift the
transfer case to 2H and operate
vehicle in 2H on dry paved
surfaces.

3) Transfer case external shift
linkage binding.

3) Lubricate, repair, or replace
linkage bushings, or tighten loose
components as necessary.

4) Insufficient or incorrect lubricant.

4) Drain and refill to edge of fill hole
with Mopar

ATF +4, Automatic

Transmission fluid.

5) Internal components binding,
worn, or damaged.

5) Disassemble the transfer case
and replace worn or damaged
components as necessary.

Transfer Case noisy in all operating
ranges.

1) Insufficient or incorrect lubricant.

1) Drain and refill to edge of fill hole
with Mopar

ATF +4, Automatic

Transmission fluid.

Noisy in, or jumps out of, four wheel
drive low range.

1) Transfer case not completely
engaged in 4L position.

1) With the transmission in
NEUTRAL, or the clutch depressed
in the case of a manual
transmission and the vehicle moving
under 3-4 km/h (2-3 mph), shift the
transfer case to NEUTRAL and then
shift into the 4L position.

2) Shift linkage out of adjustment.

2) Adjust linkage.

3) Shift linkage loose or binding.

3) Tighten, lubricate, or repair
linkage as necessary.

4) Range fork damaged, inserts
worn, or fork is binding on the shift
rail.

4) Disassemble unit and repair as
necessary.

5) Low range gear worn or
damaged.

5) Disassemble unit and repair as
necessary.

Lubricant leaking from output shaft
seal or vent.

1) Transfer case overfilled.

1) Drain lubricant to the correct
level.

2) Vent closed or restricted.

2) Clear or replace vent as
necessary.

3) Output shaft seals damaged or
installed incorrectly.

3) Replace seal as necessary.
Check to ensure that another
component, the propeller shaft slip
yoke for example, is not causing
damage to seal.

Abnormal tire wear.

1) Extended operation on hard, dry
surfaces in the 4H position.

1) Operate vehicle in the 2H
position on hard, dry surfaces.

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