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FRONT SUSPENSION
2 - 51
MODEL 60 FRONT A X L E SERVICE—4WD
V E H I C L E S
INDEX
Page
Axle Shaft and U-Joint Service
54
Complete Axle Removal/Installation . . . . . . . . . . . . 60
Differential Service
61
Drag Link Removal/Installation
59
Dualmatic Locking Hub Service
51
General Information
. . . . . . . . . . . . . . . . . . . . . . .
51
GENERAL INFORMATION
R a m T r u c k and Ramcharger vehicles equipped for
heavy d u t y 4 W D operation have a Model 60 front
axle. The housing for Model 60 f r o n t axles consists o f
a n i r o n center casting (differential
housing)
w i t h
axle shaft tubes extending from either side. The axle
shaft tubes are pressed i n t o and welded to the differ-
e n t i a l housing t o f o r m a one-piece axle housing. The
removable, stamped steel cover located at the front of
t h e differential housing provides a means for inspec-
t i o n and for differential service w i t h o u t removing the
complete f r o n t axle f r o m the vehicle. The axle has a
hypoid gear differential and t h e centerline o f the
d r i v e p i n i o n gear shaft is located below the center-
l i n e o f the r i n g gear.
A small, stamped m e t a l axle gear r a t i o identifica-
t i o n t a g is attached t o the housing cover v i a one o f
t h e cover bolts. This t a g also identifies the number of
r i n g gear and drive p i n i o n gear teeth.
The drive p i n i o n gear shaft rotates w i t h i n two t a -
pered, roller bearings. The drive p i n i o n gear shaft
rear bearing is t i g h t l y "press-fitted" on the drive p i n -
i o n gear shaft. T h e drive p i n i o n gear shaft front
b e a r i n g is very l i g h t l y "press-fitted" (which is s i m i l a r
to a "close, sliding f i t " ) on t h e drive p i n i o n gear
shaft. T h e drive p i n i o n gear shaft inner and outer
b e a r i n g cups are "press-fitted" i n t h e differential
housing bore and against a recessed shoulder. The
drive p i n i o n gear shaft depth o f mesh adjustment is
controlled b y the use o f metal depth shims t h a t are
i n s t a l l e d between the drive p i n i o n gear shaft inner
bearing and the differential housing.
The
drive
p i n i o n gear shaft
bearing
"preload"
torque is provided v i a metal shims t h a t are located
between t h e drive p i n i o n gear shaft outer bearing
cup and the differential housing.
The differential case hubs rotate i n the differential
housing v i a t w o tapered, roller bearings t h a t are
"press-fitted" on the case hubs. T h e shims t h a t are
i n s t a l l e d between t h e bearings a n d the hub shoulder
provide three functions:
• t o adjust and m a i n t a i n the " b a c k l a s h " between the
r i n g gear and the drive p i n i o n gear;
Page
Lubricant
78
Rotor/Hub and Wheel Bearing Service
. . . . . . . . .
52
Steering Knuckle Arm Removal/Installation
58
Steering Knuckle Service
56
Tie-Rod End Replacement
60
Wheel Bearing Adjustment
52
• to establish a means for o b t a i n i n g a n d t h e n r e t a i n -
i n g the differential bearing " p r e l o a d " torque; a n d
• to eliminate the differential "side play".the differ-
e n t i a l housing and axle shaft tubes (the axle hous-
ing), the differential case and t h e drive p i n i o n gear
shaft.
A Model 60 f r o n t axle has " l o c k i n g " hubs t h a t
m u s t be engaged for 4 W D operation.
CAUTION: Whenever front axle service is neces-
sary, or when the axle is being rotated via the en-
gine or other means, raise all four wheels off the
surface.
DUALMATIC LOCKING HUB SERVICE
REMOVAL/DISASSEMBLY
(1) T u r n the shift knob to the E N G A G E position
(Fig. 1).
(2) A p p l y pressure to the face o f t h e shift knob and
remove the three r e t a i n i n g screws located nearest to
the flange (Fig. 1).
(3) P u l l o u t w a r d and remove t h e shift knob from
the base (Fig. 1).
(4) Remove t h e "snap" r i n g f r o m t h e axle shaft
( F i g . l ) .
(5) Remove t h e capscrews and lockwashers
f r o m
the base flange.
(6) Separate and remove l o c k i n g h u b f r o m the ro-
tor/hub. Remove and discard the gasket.
INSPECTION
(1) Wash a l l t h e components (Fig. 1) i n m i n e r a l
spirits and blow t h e m dry w i t h compressed a i r .
(2) Examine the splines, the s h i f t knob, t h e cam,
the s l i d i n g gear, the drive shaft gear, and t h e base
for damage (Fig. 1). Replace as necessary.
ASSEMBL
Y/INSTALLA
TION
(1) Lubricate the components (Fig. 1) l i g h t l y w i t h
M O P A R Multi-Purpose L u b r i c a n t (or a n equivalent
lubricant).
(2) Position a replacement gasket and the l o c k i n g
hub onto rotor/hub (Fig. 1).
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