Jeep 1996 Grand Cherokee Service Manual - page 120
MODEL 44 AXLE
INDEX
page
page
GENERAL INFORMATION
GENERAL INFORMATION . . . . . . . . . . . . . . . . . 75
LUBRICANT SPECIFICATIONS . . . . . . . . . . . . . . 75
DESCRIPTION AND OPERATION
AXLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
TRAC-LOK OPERATION . . . . . . . . . . . . . . . . . . . 76
DIAGNOSIS AND TESTING
DRIVELINE SNAP . . . . . . . . . . . . . . . . . . . . . . . 78
GEAR AND BEARING NOISE . . . . . . . . . . . . . . . 77
GENERAL INFORMATION . . . . . . . . . . . . . . . . . 77
LIMITED SLIP DIFFERENTIAL . . . . . . . . . . . . . . 78
LOW SPEED KNOCK . . . . . . . . . . . . . . . . . . . . . 78
REAR AXLE ALIGNMENT . . . . . . . . . . . . . . . . . . 78
SERVICE DIAGNOSIS . . . . . . . . . . . . . . . . . . . . 79
TRAC-LOK NOISE DIAGNOSIS . . . . . . . . . . . . . 81
VIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
SERVICE PROCEDURES
LUBRICANT CHANGE . . . . . . . . . . . . . . . . . . . . 81
REMOVAL AND INSTALLATION
AXLE SHAFT SEAL AND BEARING . . . . . . . . . . 84
AXLE SHAFT . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
DIFFERENTIAL SIDE BEARINGS . . . . . . . . . . . . 87
DIFFERENTIAL . . . . . . . . . . . . . . . . . . . . . . . . . 85
FINAL ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . 91
PINION GEAR . . . . . . . . . . . . . . . . . . . . . . . . . . 88
PINION SHAFT SEAL REPLACEMENT . . . . . . . . 82
REAR AXLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
RING GEAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
DISASSEMBLY AND ASSEMBLY
STANDARD DIFFERENTIAL
. . . . . . . . . . . . . . . 92
TRAC-LOK DIFFERENTIAL . . . . . . . . . . . . . . . . 92
CLEANING AND INSPECTION
AXLE COMPONENTS . . . . . . . . . . . . . . . . . . . . . 96
TRAC-LOK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
ADJUSTMENTS
DIFFERENTIAL BEARING PRELOAD AND
GEAR LASH . . . . . . . . . . . . . . . . . . . . . . . . . . 99
PINION GEAR DEPTH . . . . . . . . . . . . . . . . . . . . 97
SPECIFICATIONS
MODEL 44 AXLE . . . . . . . . . . . . . . . . . . . . . . . 100
TORQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
SPECIAL TOOLS
MODEL 44 AXLE . . . . . . . . . . . . . . . . . . . . . . . 102
GENERAL INFORMATION
GENERAL INFORMATION
The Model 44 housing has an aluminum center cast-
ing (differential housing) with axle shaft tubes extend-
ing from either side. The tubes are pressed into the
differential housing to form a one–piece axle housing.
The integral type housing, hypoid gear design has
the center line of the pinion set below the center line
of the ring gear.
The axle has a vent hose to relieve internal pres-
sure caused by lubricant vaporization and internal
expansion.
The axles are equipped with semi–floating axle
shafts, meaning that loads are supported by the axle
shaft and bearings. The axle shafts are retained by
C–clips in the differential side gears.
The cover provides a means for servicing the differ-
ential without removing the axle.
The differential case is a one–piece design. The dif-
ferential pinion mate shaft is retained with a
threaded pin. Differential bearing preload and ring
gear backlash is adjusted by the use of spacer shims
positioned between the side bearing race and the
housing. Pinion bearing preload is set and main-
tained by the use of a collapsible spacer.
LUBRICANT SPECIFICATIONS
Multi–purpose, hypoid gear lubricant should be
used. The lubricant should have MIL–L–2105C and
API GL 5 quality specifications. Mopar Hypoid Gear
Lubricant conforms to both of these specifications.
• Lubricant is a thermally stable SAE 80W–90
gear lubricant.
• Lubricant for axle with Trailer Tow is SAE
75W–140 SYNTHETIC gear lubricant.
• Trac–Lok differentials add 4 oz. of friction modifier.
• Lubricant capacity is 1.66 L (3.50 pts.).
CAUTION: If axle is submerged in water, lubricant
must be replaced immediately to avoid possible
premature axle failure.
DESCRIPTION AND OPERATION
AXLES
ZJ vehicles are equipped with a Model 44 rear axle.
The Model 44 axle housing has a cast aluminum
center section. Two steel axle shaft tubes are pressed
into the center section.
ZJ
DIFFERENTIAL AND DRIVELINE
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