Jeep 1996 Grand Cherokee Service Manual page 1286

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GENERAL INFORMATION
GENERAL INFORMATION . . . . . . . . . . . . . . . . 147
RECOMMENDED LUBRICANT AND
FILL LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . 147
TRANSFER CASE IDENTIFICATION . . . . . . . . . 147
DIAGNOSIS AND TESTING
NV231 DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . 148
REMOVAL AND INSTALLATION
NV231 TRANSFER CASE . . . . . . . . . . . . . . . . . 149
SHIFT LEVER . . . . . . . . . . . . . . . . . . . . . . . . . . 149
GENERAL INFORMATION
GENERAL INFORMATION
The NV 231 is a part-time transfer case with a low
range reduction gear mechanism.
The NV 231 has three operating ranges plus a
Neutral position. The reduction gear mechanism con-
sists of a planetary and annulus gear that provide a
2.7:1 reduction ratio when engaged. The annulus
gear is fixed in the case; it does not rotate.
The input gear is splined to the transmission output
shaft. It drives the mainshaft through the planetary
gear and range hub. 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 synchro mechanism for shifting.
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
NV 231 operating ranges are:
• 2-wheel drive high (2H)
• 4-wheel drive high (4H)
• 4-wheel drive low (4L)
Two-wheel drive range is for use on all road surfaces.
The 4-wheel drive high and low ranges are not for use
on paved roads. They are only recommended for off-road
use on unpaved, low traction surfaces. The only time
4-wheel drive can be used on paved roads, is when the
road surface is covered with snow or ice.
SHIFT MECHANISM
Operating ranges are selected with a floor mounted
shift lever. The shift lever is connected to the transfer
TRANSMISSION AND TRANSFER CASE
NV231 TRANSFER CASE
INDEX
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DISASSEMBLY AND ASSEMBLY
CLEANING AND INSPECTION
ADJUSTMENTS
SPECIFICATIONS
SPECIAL TOOLS
case range lever by an adjustable linkage rod. A straight
line shift pattern is used. Range positions are marked
on the shifter bezel cover plate, or on the shift knob.
TRANSFER CASE IDENTIFICATION
each transfer case (Fig. 1). The ID tag provides the
transfer case model number, assembly number, serial
number, and low range ratio.
the date of build. For example, a serial number of
7-10-95 would represent July 10, 1995.
RECOMMENDED LUBRICANT AND FILL LEVEL
case is Mopar Dexron II, or ATF Plus. Approximate
lubricant fill capacity is 1.18 liters (2.2 pints).
(Fig. 1). Correct fill level is to the bottom edge of the
fill plug hole. Be sure the vehicle is level to ensure
an accurate fluid level check.
NV231 TRANSFER CASE . . . . . . . . . . . . . . . . . 150
NV231 TRANSFER CASE . . . . . . . . . . . . . . . . . 163
SHIFT LINKAGE ADJUSTMENT . . . . . . . . . . . . 167
TORQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
SPECIAL TOOLS—NV231 . . . . . . . . . . . . . . . . 168
A circular ID tag is attached to the rear case of
The transfer case serial number also represents
Fig. 1 Fill/Drain Plug And I.D. Tag Locations
Recommended lubricant for the NV 231 transfer
The fill and drain plugs are both in the rear case
21 - 147
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