Jeep 1997 Grand Cherokee Service Manual page 108

3 - 50 DIFFERENTIAL AND DRIVELINE
GENERAL INFORMATION
194 RBI AXLE . . . . . . . . . . . . . . . . . . . . . . . . . 50
LUBRICANT SPECIFICATIONS
DESCRIPTION AND OPERATION
STANDARD DIFFERENTIAL . . . . . . . . . . . . . . . 51
TRAC-LOK OPERATION . . . . . . . . . . . . . . . . . . 51
DIAGNOSIS AND TESTING
BEARING NOISE . . . . . . . . . . . . . . . . . . . . . . . 52
DRIVELINE SNAP . . . . . . . . . . . . . . . . . . . . . . 53
GEAR NOISE . . . . . . . . . . . . . . . . . . . . . . . . . . 52
GENERAL INFORMATION . . . . . . . . . . . . . . . . 52
LOW SPEED KNOCK . . . . . . . . . . . . . . . . . . . . 53
TRAC–LOK DIFFERENTIAL NOISE
TRAC–LOK TEST . . . . . . . . . . . . . . . . . . . . . . . 56
VIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
SERVICE PROCEDURES
LUBRICANT CHANGE . . . . . . . . . . . . . . . . . . . 56
REMOVAL AND INSTALLATION
AXLE SHAFT SEAL AND BEARING . . . . . . . . . 62
AXLE SHAFT . . . . . . . . . . . . . . . . . . . . . . . . . . 62
COLLAPSIBLE SPACER . . . . . . . . . . . . . . . . . . 59
DIFFERENTIAL SIDE BEARINGS . . . . . . . . . . . 65
GENERAL INFORMATION
194 RBI AXLE
The 194 Rear Beam-design Iron (RBI) axle housing
has an iron center casting (differential housing) with
axle shaft tubes extending from either side. The
tubes are pressed into and welded to the differential
housing to form a one-piece axle housing.
The integral type, hypoid gear design, housing has
the centerline of the pinion set below the centerline
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.
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.
194 RBI AXLE
INDEX
page
. . . . . . . . . . . . 50
. . . . . . . . . 53
DIFFERENTIAL . . . . . . . . . . . . . . . . . . . . . . . . 63
FINAL ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . 70
PINION GEAR . . . . . . . . . . . . . . . . . . . . . . . . . 66
PINION SHAFT SEAL . . . . . . . . . . . . . . . . . . . . 57
REAR AXLE . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
RING GEAR . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
DISASSEMBLY AND ASSEMBLY
STANDARD DIFFERENTIAL . . . . . . . . . . . . . . . 71
TRAC-LOK DIFFERENTIAL
CLEANING AND INSPECTION
AXLE COMPONENTS
TRAC-LOK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
ADJUSTMENTS
DIFFERENTIAL BEARING PRELOAD AND
GEAR BACKLASH . . . . . . . . . . . . . . . . . . . . . 78
GEAR CONTACT PATTERN ANALYSIS
PINION GEAR DEPTH . . . . . . . . . . . . . . . . . . . 76
SPECIFICATIONS
194 RBI AXLE . . . . . . . . . . . . . . . . . . . . . . . . . 82
194 RBI AXLE . . . . . . . . . . . . . . . . . . . . . . . . . 82
SPECIAL TOOLS
194 RBI AXLE . . . . . . . . . . . . . . . . . . . . . . . . . 82
The 194 RBI 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 194 RBI
. . . . . . . . . . . . . . . 72
. . . . . . . . . . . . . . . . . . . 75
. . . . . . 80
ZG
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