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2 - 76
FRONT SUSPENSION
(20) I n s t a l l the other differential b e a r i n g on t h e
h u b w i t h Bearing I n s t a l l a t i o n Tool C-4025-A a n d
D r i v e r Handle Tool C-4171 ( F i g . 50).
(21) M a t c h each bearing cup w i t h i t s differential
bearing (original) counterpart a n d i n s t a l l t h e cups on
the bearings.
(22) Position Spreader Tool W-129-A o n t h e differ-
e n t i a l housing w i t h t h e tool dowel pins "seated" i n
the locating holes ( F i g . 48). I n s t a l l t h e holddown
clamps
a n d t i g h t e n t h e tool t u r n b u c k l e
"finger-
t i g h t " .
(23) I n s t a l l a pilot s t u d a t t h e left side o f t h e dif-
ferential housing. A t t a c h D i a l Indicator Tool C-3339
to t h e differential housing ( v i a t h e p i l o t stud) w i t h
the indicator plunger s l i g h t l y "loaded" against t h e
opposite side of t h e differential housing ( F i g . 48).
"Zero" t h e d i a l indicator pointer.
CAUTION:
Do not exceed the specified separation
distance when separating the differential housing. If
the housing is over-separated, it could be distorted
or damaged, which would necessitate replacement.
(24) T i g h t e n the spreader tool t u r n b u c k l e ( F i g . 48)
and separate the differential housing o n l y enough to
i n s t a l l t h e differential case i n t h e housing. S e p a r a t e
t h e d i f f e r e n t i a l h o u s i n g a m a x i m u m d i s t a n c e o f
0.38 m m (0.015 i n ) w i t h t h e s p r e a d e r t o o l . Mea-
sure t h e separation distance w i t h t h e d i a l indicator
(Fig. 48) as the housing is being separated.
(25) Remove t h e d i a l indicator tool a n d t h e p i l o t
stud ( F i g . 48) when t h e differential housing has been
separated sufficiently t o i n s t a l l t h e d i f f e r e n t i a l case
i n t h e housing.
(26) I n s t a l l the differential case i n t h e differential
housing.
(27) Remove the holddown clamps a n d t h e spreader
tool f r o m t h e differential housing (Fig. 48).
(28) I n s t a l l t h e differential bearing caps. Ensure
t h a t t h e i n s t a l l a t i o n reference letter stamped i n each
cap corresponds to t h e letter stamped i n t h e differen-
t i a l housing (Fig. 51). T i g h t e n t h e b e a r i n g cap bolts
w i t h 95 t o 122 N-m (70 to 90 ft-lbs) torque.
(29)
Measure t h e r i n g gear " b a c k l a s h " a t four
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. 52).
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 "backlash" 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.
"Backlash"
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 d i f f e r e n t i a l
case t o t h e other (Fig. 53).
Fig. 51 Differential Bearing Cap Reference Letters
Fig. 52 Ring Gear "Backlash" Measurement
GEAR TEETH
CONTACT
PATTERNS
I f the drive p i n i o n gear depth of mesh a n d t h e r i n g
gear "backlash" have been correctly established ac-
cording to t h e instructions a n d 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.
(1) A p p l y a t h i n coat of H y d r a t e d Ferric Oxide
(commonly referred to as Yellow Oxide o f Iron), or a n
equivalent product, t o both t h e " d r i v e " side and the
"coast" side of t h e r i n g gear teeth.
(2) Rotate t h e r i n g gear one complete revolution i n
both directions w h i l e a load is being applied w i t h a
round b a r or screwdriver inserted between t h e differ-
e n t i a l housing a n d t h e differential case flange. This
action w i l l produce a distinct contact p a t t e r n on both
the " d r i v e " side a n d t h e "coast" side of the r i n g gear
teeth.
T h e
g e a r t e e t h c o n t a c t p a t t e r n w i l l
d i s c l o s e
w h e t h e r o r n o t t h e d r i v e p i n i o n g e a r s h a f t r e a r
b e a r i n g d e p t h s h i m h a s t h e c o r r e c t
t h i c k n e s s
a n d w h e t h e r o r n o t t h e r i n g g e a r " b a c k l a s h " h a s
b e e n
a d j u s t e d
c o r r e c t l y .
T h e " b a c k l a s h " b e -
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