Jeep 1997 Grand Cherokee Service Manual page 145

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GENERAL INFORMATION
216 RBA AXLE . . . . . . . . . . . . . . . . . . . . . . . . . 87
LUBRICANT SPECIFICATIONS
DESCRIPTION AND OPERATION
STANDARD DIFFERENTIAL . . . . . . . . . . . . . . . 88
TRAC-LOK OPERATION . . . . . . . . . . . . . . . . . . 88
DIAGNOSIS AND TESTING
BEARING NOISE . . . . . . . . . . . . . . . . . . . . . . . 89
DRIVELINE SNAP . . . . . . . . . . . . . . . . . . . . . . 90
GEAR NOISE . . . . . . . . . . . . . . . . . . . . . . . . . . 89
GENERAL INFORMATION . . . . . . . . . . . . . . . . 89
LOW SPEED KNOCK . . . . . . . . . . . . . . . . . . . . 90
TRAC–LOK DIFFERENTIAL NOISE
TRAC–LOK TEST . . . . . . . . . . . . . . . . . . . . . . . 93
VIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
SERVICE PROCEDURES
LUBRICANT CHANGE . . . . . . . . . . . . . . . . . . . 93
REMOVAL AND INSTALLATION
AXLE SHAFT SEAL AND BEARING . . . . . . . . . 99
AXLE SHAFT . . . . . . . . . . . . . . . . . . . . . . . . . . 98
COLLAPSIBLE SPACER . . . . . . . . . . . . . . . . . . 96
DIFFERENTIAL SIDE BEARINGS . . . . . . . . . . 101
GENERAL INFORMATION
216 RBA AXLE
The 216 Rear Beam-design Aluminum (RBA) axle
housing has an aluminum center casting (differential
housing) with axle shaft tubes extending from either
side. The tubes are pressed into the differential hous-
ing 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 vehicle load is 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.
For vehicles equipped with ABS brakes, the axles
have a tone ring pressed onto the axle shaft. Use
care when removing axle shafts to ensure that the
tone wheel or the wheel speed sensor are not dam-
aged.
216 RBA AXLE
INDEX
page
. . . . . . . . . . . . 87
. . . . . . . . . 90
DIFFERENTIAL AND DRIVELINE
DIFFERENTIAL . . . . . . . . . . . . . . . . . . . . . . . 100
FINAL ASSEMBLY . . . . . . . . . . . . . . . . . . . . . 106
PINION GEAR . . . . . . . . . . . . . . . . . . . . . . . . 103
PINION SHAFT SEAL . . . . . . . . . . . . . . . . . . . . 94
REAR AXLE . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
RING GEAR . . . . . . . . . . . . . . . . . . . . . . . . . . 101
DISASSEMBLY AND ASSEMBLY
STANDARD DIFFERENTIAL . . . . . . . . . . . . . . 107
TRAC-LOK DIFFERENTIAL
CLEANING AND INSPECTION
AXLE COMPONENTS . . . . . . . . . . . . . . . . . . . 111
TRAC-LOK . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
ADJUSTMENTS
DIFFERENTIAL BEARING PRELOAD AND
GEAR BACKLASH . . . . . . . . . . . . . . . . . . . . 113
GEAR CONTACT PATTERN ANALYSIS . . . . . . 115
PINION GEAR DEPTH
SPECIFICATIONS
216 RBA AXLE . . . . . . . . . . . . . . . . . . . . . . . . 118
TORQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
SPECIAL TOOLS
216 RBA AXLE . . . . . . . . . . . . . . . . . . . . . . . . 118
The 216 RBA axle has the assembly part number
and gear ratio listed on a tag. The tag is attached to
the differential housing by a cover bolt. Build date
identification codes are stamped on the cover side of
an axle shaft tube.
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 selective
spacer shims. Pinion bearing preload is set and
maintained by the use of a collapsible spacer (Fig. 1).
LUBRICANT SPECIFICATIONS
A multi–purpose, hypoid gear lubricant which con-
forms to the following specifications should be used.
Mopar Hypoid Gear Lubricant conforms to all of
these specifications.
• The lubricant should have MIL–L–2105C and
API GL 5 quality specifications.
• Lubricant is a thermally stable SAE 80W–90
gear lubricant.
• Lubricant for axles intended for heavy-duty or
trailer tow use is SAE 75W–140 SYNTHETIC gear
lubricant.
Trac-lok differentials require the addition of 4 oz.
of friction modifier to the axle lubricant. The 216
3 - 87
. . . . . . . . . . . . . . 107
. . . . . . . . . . . . . . . . . . 111
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