Chrysler Vehicle User Manual page 104

TJ
FRONT AXLE - 216FBI
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 45
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
DIAGNOSIS AND TESTING . . . . . . . . . . . . . . . . 45
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 49
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . 50
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 57
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . 57
AXLE SHAFTS
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 60
AXLE SHAFT SEALS
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 60
SINGLE CARDAN UNIVERSAL JOINT
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 61
FRONT AXLE - 216FBI
DESCRIPTION
The Front Beam-design Iron (FBI) axle consists of
a cast iron differential housing with axle shaft tubes
extending from either side. The tubes are pressed
into the differential housing and welded. The integral
type housing, hypoid gear design has the centerline
of the pinion set below the centerline of the ring gear.
The axles are equipped with full–floating axle
shafts, meaning that loads are supported by the hub
bearings. The axle shafts are retained by nuts at the
hub bearings. The hub bearings are bolted to the
steering knuckle at the outboard end of the axle tube
yoke. The hub bearings are serviced as an assembly.
OPERATION
The axle receives power from the transfer case
through the front propeller shaft. The front propeller
shaft is connected to the pinion gear which rotates
the differential through the gear mesh with the ring
gear bolted to the differential case. The engine power
is transmitted to the axle shafts through the pinion
mate and side gears. The side gears are splined to
the axle shafts.
FRONT AXLE - 216FBI
TABLE OF CONTENTS
page
FRONT AXLE - 216FBI
PINION SEAL
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 62
DIFFERENTIAL - LOCKER
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 63
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
DIAGNOSIS AND TESTING . . . . . . . . . . . . . . . . 63
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . 66
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 68
DIFFERENTIAL - LOCKER PUMP
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 70
PINION GEAR/RING GEAR
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 73
DIAGNOSIS AND TESTING
GEAR NOISE
Axle gear noise can be caused by insufficient lubri-
cant, incorrect backlash, tooth contact, worn/damaged
gears or the carrier housing not having the proper
offset and squareness.
Gear noise usually happens at a specific speed
range. The noise can also occur during a specific type
of driving condition. These conditions are accelera-
tion, deceleration, coast, or constant load.
When road testing, first warm-up the axle fluid by
driving the vehicle at least 5 miles and then acceler-
ate the vehicle to the speed range where the noise is
the greatest. Shift out-of-gear and coast through the
peak-noise range. If the noise stops or changes
greatly:
• Check for insufficient lubricant.
• Incorrect ring gear backlash.
• Gear damage.
Differential side gears and pinions can be checked
by turning the vehicle. They usually do not cause
noise during straight-ahead driving when the gears
are unloaded. The side gears are loaded during vehi-
cle turns. A worn pinion mate shaft can also cause a
snapping or a knocking noise.
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