2006 DODGE RAM SRT-10 Service Repair Manual

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Page 4265 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual TRANSFER CASE - NV273 - SERVICE INFORMATION
DESCRIPTION
The NV273 is an electronically controlled part-time transfer case with a low range gear reduction system. The
NV273 has three operating ranges p

TRANSFER CASE - NV273 - SERVICE INFORMATION
DESCRIPTION
The NV273 is an electronically controlled part-time transfer case with a low range gear reduction system. The
NV273 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 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 desireto 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.
IDENTIFICATION
A circular ID tag (2)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 themodefork,whichoperatesthemode
sleeve and hub. The sleeve and hub are not equipped with a synchronizer mechanism for shifting.

Page 4266 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual DIAGNOSIS AND TESTING - TRANSFER CASE - NV273
DIAGNOSIS CHART
Condition Possible Cause Correction
Transfer case difficult to shift or will
not shift into desired range.1) Transfer case electronically

DIAGNOSIS AND TESTING - TRANSFER CASE - NV273
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 casewith
the correct quantity of Mopar
AT F
+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 casewith
the correct quantity of Mopar
AT F
+4, type 9602, Automatic
Transmission Fluid.
2) Internal transfer case
components binding, worn, or
damaged.2) Repair or replace components as
necessary.
Transfer case noisy while in, or
jumps out of, 4LO mode.1) Transfer case not completely
engaged in 4LO position.1) While rolling 2-3 MPH and the
transmission in NEUTRAL, or clutch
depressed on vehicles equipped
with a manual transmission, shift
transfer case to the 2WD or 4HI
position, and then back into the 4LO
position.
2) Range fork damaged, inserts
worn, or fork is binding on the shift
rail.2) Repair or replace components as
necessary.
3) Low range gear worn or
damaged.3) Repair or replace components as
necessary.
Lubricant leaking from transfer case
seals or vent.1) Transfer case overfilled. 1) Drain lubricant to the correct
level.
2) Transfer case vent closed or
restricted.2) Clean or replace vent as
necessary.
3) Transfer case seals damaged or
installed incorrectly.3) Replace suspect seal.
Abnormal tire wear. 1) Extended operation in 4HI mode
on dry surfaces,1) Operate vehicle in 2WD mode on
dry surfaces.

Page 4267 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual REMOVAL
1. Shift transfer case into 2WD.
2. Raise vehicle.
3. Drain transfer case lubricant.
4. Mark front and rear propeller shafts for alignment
reference.
5. Support transmission with jack stand.
6

Page 4268 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 5. Use a suitable chisel or pry tool to remove the rear
extension housing (1) dust boot (2).
6. Use a suitable chisel or pry tool to remove the rear
extension housing seal.
7. Remove rear extension (1

Page 4269 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual OIL PUMP AND REAR CASE
1. Disengage the oil pump pick-up tube (2) from the
oil pump (1).
NOTE: The oil pump pick-up tube seals to the oil
pump with an o-ring. Verify that the o-ring was
removed with t

Page 4270 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 3. Remove rear case (2) -to-front case (1) bolts (3).
4. Remove the rear output shaft bearing inner snap-
ring (3) from the output shaft (1) using suitable
snap-ring pliers.
5. Remove the rear output

Page 4271 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 6. Loosen rear case (2) from front case (1) with pry
tool to break sealer bead. Insert tool at each end of
case.
7. Unseat rear case from alignment dowels.
8. Remove the rear case (2) from the front c

Page 4272 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual FRONT OUTPUT SHAFT AND DRIVE CHAIN
1. Remove the oil pick-up tube (3) and screen from
the front case half (1).
2. Remove the front output shaft (1) drive sprocket (2)
retaining ring (3).

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