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(17) Pry t h e d i f f e r e n t i a l case t o w a r d the left side of
the housing w i t h t h e p r y bar and r e c o r d the t r a v e l
distance indicated b y t h e d i a l indicator pointer.
T h e
m e a s u r e m e n t
a b o v e i n d i c a t e s
t h e s h i m
t h i c k n e s s n e c e s s a r y f o r d i f f e r e n t i a l case " z e r o "
" e n d - p l a y " (i.e., t o e l i m i n a t e t h e space/gap t h a t
exists b e t w e e n t h e d i f f e r e n t i a l b e a r i n g s a n d t h e
d i f f e r e n t i a l case). T h e a c t u a l t o t a l s h i m t h i c k -
ness w i l l b e d e t e r m i n e d
d u r i n g t h e r i n g g e a r
" b a c k l a s h " a d j u s t m e n t (after i n s t a l l a t i o n o f t h e
d r i v e p i n i o n g e a r s h a f t ) .
(18) Remove t h e d i a l indicator tool a n d the p i l o t
stud from t h e d i f f e r e n t i a l housing.
(19) Remove the differential bearing caps.
(20) Position Spreader Tool D-167 o n the differen-
t i a l housing w i t h t h e tool dowel pins "seated" i n the
locating holes (Fig. 17). I n s t a l l the holddown clamps
and t i g h t e n t h e tool t u r n b u c k l e " f i n g e r - t i g h t " .
(21) I n s t a l l a p i l o t s t u d a t the left side o f the dif-
ferential housing. A t t a c h D i a l Indicator Tool C-3339
to the differential h o u s i n g (via the p i l o t stud) w i t h
the indicator p l u n g e r s l i g h t l y "loaded" against t h e
opposite side o f the differential housing (Fig. 17).
"Zero" the d i a l i n d i c a t o r 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.
(22) T i g h t e n the spreader tool t u r n b u c k l e (Fig. 17)
and separate the d i f f e r e n t i a l housing only enough to
remove the d i f f e r e n t i a l case from the housing. Sepa-
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 . Measure the separation distance w i t h the d i a l
indicator (Fig. 17) as t h e housing is being separated.
(23) Remove t h e d i a l indicator tool and the p i l o t
stud (Fig. 17) w h e n t h e differential housing has been
separated sufficiently t o remove the differential case
from the housing.
(24) Remove the differential case from the differen-
t i a l housing.
(25) Remove t h e holddown clamps and the spreader
tool from the d i f f e r e n t i a l housing (Fig. 17).
DRIVE PINION GEAR DEPTH
INFORMATION
Drive p i n i o n gear shafts and r i n g gears are sup-
plied as "matched sets" only. T h e i d e n t i f y i n g n u m -
bers for both the d r i v e p i n i o n gear and t h e r i n g gear
are etched i n t o the face o f each gear (Fig. 19). I n ad-
dition, either a plus (" + ") number, a m i n u s
("-")
number or a zero ("0") i s also etched i n t o the face of
the drive p i n i o n gear. T h i s number indicates t h e
amount ( i n thousandths o f a n inch) t h a t the drive
p i n i o n gear depth o f mesh varies from the standard
depth " s e t t i n g " o f 3.125 inches (79.37 m m ) for Model
60 axles. T h e standard depth o f mesh provides t h e
best teeth contact between t h e drive p i n i o n gear
teeth and the r i n g gear teeth. The depth variance o f
a drive p i n i o n gear can be either greater ( + ) , zero (0)
or less t h a n (-) the standard depth.
DRIVE PINION
Fig. 19 Drive Pinion Gear ID Numbers
The standard depth is the distance (Fig. 20) f r o m
the centerline o f t h e axle shaft/ring gear to the face
of the drive p i n i o n gear. For a Model 60 axle, t h e
standard depth/distance is 3.125 inches (79.37 m m ) .
For a Model 70 axle, the standard depth/distance is
3.5 inches (88.9 m m ) .
AXLE
PINION
MODEL
SETTING
Fig. 20 Drive Pinion Gear Standard Depth/Distance
Compensation for the depth variance is achieved by
shims placed adjacent t o the drive p i n i o n gear shaft
rear bearing cup (Fig. 21).
F o r e x a m p l e :
• o n e c o m p l e t e " p a c k "
o f d e p t h s h i m s i s r e -
q u i r e d i f t h e d e p t h v a r i a n c e i s " 0 " ;
• i f t h e d e p t h v a r i a n c e i s " + 3 " ( m + 8), t h e d r i v e
p i n i o n g e a r w o u l d r e q u i r e 0.003 i n c h (0.08 m m )
less i n s h i m t h i c k n e s s t h a n a d e p t h v a r i a n c e o f
" 0 " (i.e., o n e c o m p l e t e s h i m " p a c k " m i n u s 0.003
i n c h o r 0.08 m m ) ;
• b y r e d u c i n g t h e t h i c k n e s s o f t h e s h i m s 0.003
i n c h (0.08 mm), t h e d e p t h p o s i t i o n o f t h e d r i v e
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