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(5) W i t h a " g r a d u a l " t h r o t t l e opening, attempt to
slowly d r i v e the vehicle over the block of wood.
(6) I f the K r a f t paper slips out from under the rear
wheel/tire before the f r o n t wheel/tire moves over t h e
block of wood; reposition the vehicle so t h a t the pa-
per and board are under the opposite rear wheel/tire;
and a t t e m p t t o drive over the block o f wood the sec-
ond t i m e .
(7) I f t h e front wheel/tire moves over the block o f
wood on e i t h e r the first or second attempt, the axle
can be considered to be functioning normally.
DIFFERENTIAL
CASE
SERVICE
REMOVAL
Refer to t h e differential case removal procedure for
a standard differential.
CLEANING/INSPECTION
(1) Clean t h e T r a c - L o k differential case and com-
ponents (Fig. 40) w i t h fast evaporating m i n e r a l spir-
its or a d r y cleaning solvent. W i t h the exception o f
t h e differential bearings, dry the case and the com-
ponents w i t h compressed air.
(2) Inspect the differential bearing rollers and cups
for " p i t t i n g " , " s p a l l i n g " and other visible damage. I f
differential bearing replacement is necessary, remove
t h e bearings from t h e differential case according to
t h e procedure provided for a standard differential
bearing.
(3) Inspect the differential case for cracks and other
visible damage t h a t could cause i t t o be unusable.
ASSEMBLY
(1) I f t h e r i n g gear was removed for a n y reason
f r o m the differential case (or i f i t is being replaced),
replacement r i n g gear bolts must be installed.
(2) Place t h e differential case i n an appropriate fix-
t u r e . I n s t a l l t h e r i n g gear w i t h replacement bolts.
T i g h t e n t h e bolts w i t h 136 to 203 N*m (100 to 120
ft-lbs) torque.
INSTALLATION
Refer to t h e differential case i n s t a l l a t i o n procedure
provided for a standard differential.
LUBRICANTS
TYPE
Multi-purpose, hypoid gear lubricant, as defined b y
M I L - L - 2 1 0 5 - B a n d b y A P I G L 5 q u a l i t y specifica-
tions, should be used for Model 60, 6 0 M and 70 rear
axles w i t h standard or Trac-Lok differentials. M O -
P A R
H y p o i d Gear L u b r i c a n t conforms t o b o t h of
these specifications and i s h i g h l y recommended for
use w i t h R a m T r u c k and Ramcharger vehicles. I n ad-
d i t i o n , 4 ounces o f M O P A R Hypoid Gear L u b r i c a n t
A d d i t i v e (or a n equivalent f r i c t i o n modifier product)
can be included w i t h a r e - f i l l for T r a c - L o k differen-
t i a l s .
CAUTION: If the rear axle is submerged in water,
the axle lubricant must be replaced immediately to
avoid the possibility of premature axle failure re-
sulting from water contamination of the lubricant.
DRAIN AND
REFILL
(1) D r i v e t h e vehicle u n t i l the gear l u b r i c a n t i n the
axle a t t a i n s t h e n o r m a l operating temperature.
(2) Raise a n d support t h e vehicle.
(3) Remove the l u b r i c a n t f i l l hole p l u g f r o m the dif-
ferential h o u s i n g cover.
(4) Remove the differential housing cover and allow
t h e o r i g i n a l l u b r i c a n t t o completely d r a i n f r o m t h e
housing a n d t h e axle shaft tubes.
CAUTION: DO NOT FLUSH Trac-Lok differentials.
Trac-Lok differentials may be cleaned only by dis-
assembling the unit and wiping with clean, lint-free
cloths.
(5) F o r standard differentials (only), f l u s h t h e dif-
ferential a n d t h e housing cavity w i t h a " f l u s h i n g " o i l
(or l i g h t engine oil) t o remove residual l u b r i c a n t and
foreign m a t t e r . D o n o t use w a t e r , s t e a m , k e r o s e n e
o r g a s o l i n e f o r f l u s h i n g .
(6)
I n s t a l l t h e differential
housing
cover a n d
t i g h t e n t h e bolts w i t h 47 N*m (35 ft-lbs) Torque.
(7) Refill t h e differential housing 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 to Rear A x l e
Specifica-
tions. A container of M O P A R Hypoid Gear L u b r i c a n t
A d d i t i v e (a f r i c t i o n modifier) can also be added for
Trac-Lok differentials.
(8) I n s t a l l and t i g h t e n t h e f i l l hole p l u g w i t h 34
N - m (25 ft-lbs) torque.
(9) Remove t h e supports and lower the vehicle, o f
M O P A R H y p o i d Gear L u b r i c a n t .
(10) I f equipped w i t h a Trac-Lok differential, drive
t h e vehicle
a n d make 10 to 12 slow,
figure-eight
t u r n s . T h i s type of maneuver w i l l ensure t h a t the re-
placement l u b r i c a n t is pumped t h r o u g h t h e Trac-Lok
clutch discs.
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