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3 - 52
REAR AXLES
•
(29) Measure the r i n g gear "backlash" a t three
equally spaced locations around t h e perimeter o f t h e
r i n g gear w i t h a d i a l indicator (Fig. 39).
Fig. 39 Ring Gear "Backlash" Measurement
T h e r i n g g e a r " b a c k l a s h " m u s t b e w i t h i n 0.004
- 0.009 i n c h (0.10 - 0.23 m m ) a n d i t c a n n o t v a r y
m o r e t h a n 0.002 i n c h (0.05 m m ) a t a n y o f t h e
m e a s u r e m e n t l o c a t i o n s .
(30) Excessive " b a c k l a s h " is corrected b y m o v i n g
the r i n g gear teeth closer to t h e drive p i n i o n gear
teeth. Insufficient "backlash" is corrected b y m o v i n g
the r i n g gear teeth away from t h e drive p i n i o n gear
teeth.
" B a c k l a s h " correction
is accomplished b y
t r a n s f e r r i n g shims f r o m one side of t h e differential
case to t h e other (Fig. 30).
GEAR TEETH
CONTACT
PATTERNS
I f t h e d r i v e p i n i o n gear depth o f mesh a n d the r i n g
gear " b a c k l a s h " have been correctly established ac-
cording to t h e instructions and i n f o r m a t i o n provided
i n the procedures above, good gear teeth contact pat-
terns should exist.
INSTALLATION
(1) I n s t a l l t h e axle shafts i n t h e axle shaft tubes. I f
necessary, refer to t h e i n s t a l l a t i o n procedure.
(2) Remove any residual R T V sealant/gasket mate-
r i a l f r o m t h e differential housing a n d cover m a t i n g
surfaces, t h o r o u g h l y clean t h e surfaces w i t h m i n e r a l
spirits (or a n equivalent cleaning solution) a n d d r y
the surfaces completely.
(3) A p p l y a t h i n "bead" of M O P A R R T V Sealant (or
an equivalent sealant) around t h e bolt circle on t h e
housing a n d on t h e cover. A l l o w t h e s e a l a n t t o
" c u r e " f o r f e w m i n u t e s .
I f f o r a n y r e a s o n t h e d i f f e r e n t i a l h o u s i n g c o v e r
is n o t i n s t a l l e d w i t h i n 20 m i n u t e s a f t e r a p p l y i n g
the
s e a l a n t , t h e s e a l a n t m u s t b e r e m o v e d a n d
a n o t h e r " b e a d " o f s e a l a n t a p p l i e d .
(4) I n s t a l l t h e housing cover on t h e differential
housing w i t h t h e attaching bolts. I n s t a l l t h e a x l e
g e a r r a t i o i d e n t i f i c a t i o n t a g u n d e r o n e o f t h e
c o v e r b o l t s . T i g h t e n the cover bolts w i t h 47 N - m (35
ft-lbs)
torque.
(5) Remove t h e supports a n d raise or lower t h e
hoist u n t i l t h e vehicle is level.
(6) Remove t h e f i l l hole p l u g a n d f i l l t h e differen-
t i a l h o u s i n g a n d t h e axle tubes w i t h t h e specified
q u a n t i t y o f M O P A R H y p o i d Gear L u b r i c a n t (or a n
equivalent product). Refer t o Rear A x l e
Specifica-
tions. I n s t a l l t h e f i l l hole p l u g a n d t i g h t e n w i t h 34
N»m (25 ft-lbs) torque.
(7) Lower t h e vehicle and test t h e brakes a n d t h e
axle for proper operation.
TRAC-LOK DIFFERENTIAL SERVICE
GENERAL
INFORMATION
Model 60, 6 0 M and 70 rear axles equipped w i t h a
T r a c - L o k
differential are o p t i o n a l l y available for
R a m T r u c k vehicles.
A T r a c - L o k differential has a one-piece differen-
t i a l case, t h e same i n t e r n a l components as a stan-
d a r d d i f f e r e n t i a l , plus two clutch disc packs (Fig. 40).
W h e n engine torque is applied t o t h e differential
r i n g gear, t h e i n i t i a l spring " l o a d i n g " of the clutches
is supplemented by t h e gear-separating f r i c t i o n be-
tween t h e differential side gears a n d t h e p i n i o n
gears, a n d t h i s progressively increases t h e t o t a l fric-
t i o n i n t h e differential. W h e n a l o w t r a c t i o n surface
is encountered (e.g., m u d or snow), t h i s i n t e r n a l fric-
t i o n is t h e means for t r a n s f e r r i n g more of the engine
torque to t h e rear wheel/tire t h a t has the better trac-
t i o n surface a n d less torque to t h e wheel/tire w i t h
the lower t r a c t i o n surface. Because a T r a c - L o k dif-
f e r e n t i a l is n o t a positive " l o c k i n g " type of differen-
t i a l , t h e f r i c t i o n w i l l decrease a n d t h e clutches w i l l
release t h e side gears before excessive engine torque
is applied t o either one of t h e wheels/tires. T h e
w h e e l / t i r e w i t h t h e l e a s t t r a c t i o n w i l l " s p i n " s i m -
i l a r l y t o t h e a p t i o n o f a s t a n d a r d d i f f e r e n t i a l
w h e n e x t r e m e d i f f e r e n c e s i n s u r f a c e t r a c t i o n a r e
e n c o u n t e r e d . D u r i n g n o r m a l d r i v i n g conditions, t h e
controlled i n t e r n a l f r i c t i o n is easily overcome w h e n a
vehicle is t u r n i n g a corner so t h a t the d r i v i n g wheels
can rotate a t different speeds.
SERVICE
INFORMATION
The service information/procedures for a T r a c - L o k
differential are essentially the same as those used for
a standard differential, therefore, only information/
procedures i n v o l v i n g t h e differences t h a t exist be-
tween t h e t w o differential types w i l l be provided
w i t h i n t h i s section.
The rear wheel anti-lock ( R W A L ) brake sensor is
attached t o t h e top, forward exterior area of t h e dif-
ferential housing. There is a seal located between t h e
sensor a n d t h e wire connector. T h i s seal m u s t b e
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