Dodge D150 1990 Service Manual page 137

2 - 68 FRONT SUSPENSION •
p i n i o n gear depth o f mesh varies from t h e 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 t h e r i n g gear teeth. The depth variance of
a d r i v e 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. 31 Drive Pinion Gear ID Numbers
The standard depth is t h e distance (Fig. 32) from
the centerline o f the axle shaft/ring gear t o the face
of t h e drive p i n i o n gear. F o r a Model 60 axle, t h e
standard depth/distance i s 3.125 inches (79.37 m m ) .
MODEL DEPTH
60 SETTING
Fig. 32 Drive Pinion Gear Standard Depth/Distance
Compensation for t h e depth variance is achieved by
shims placed adjacent t o t h e drive p i n i o n gear shaft
rear bearing cup (Fig. 33).
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 ) ;
DRIVE
Fig. 33 Shim Locations
• 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 m m ) , 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
p i n i o n g e a r w i l l b e d e c r e a s e d f r o m 3.128 i n c h e s
(79.45 m m ) t o t h e s t a n d a r d d e p t h o f 3.125 i n c h e s
(79.37 m m ) ; o r
• 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 )
m o r e 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 " p l u s 0.003
i n c h o r 0.08 m m ) ;
• b y i n c r e a s 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 m m ) , 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
p i n i o n g e a r w i l l b e i n c r e a s e d f r o m 3.122 i n c h e s
(79.34 m m ) t o t h e s t a n d a r d d e p t h o f 3.125 i n c h e s
(79.37 m m ) .
I f t h e o r i g i n a l drive p i n i o n gear shaft a n d r i n g
gear set w i l l be installed b u t the depth shims m u s t
be replaced, measure t h e thickness o f the o r i g i n a l
depth shims a n d " b u i l d " a replacement "pack" o f
depth shims w i t h the same thickness.
I f e q u i p p e d , t h e o i l s l i n g e r l o c a t e d b e t w e e n t h e
r e a r b e a r i n g a n d t h e t h r u s t face o f d r i v e p i n i o n
g e a r m u s t b e m e a s u r e d a n d t h e t h i c k n e s s i n -
c l u d e d w i t h t h e t o t a l s h i m " p a c k " t h i c k n e s s .
I f the o r i g i n a l d r i v e pinion/ring gear set is not re-
usable, the d e p t h s h i m thickness for the replacement
drive p i n i o n gear m u s t be determined before i n s t a l l -
i n g the d i f f e r e n t i a l case i n the housing.
I f a replacement gear set is being installed, note
the depth variance etched into both the o r i g i n a l and
the replacement drive p i n i o n gear, a n d alter t h e
thickness o f t h e o r i g i n a l depth shims to compensate
for the difference i n the depth variances. Refer to the
D r i v e P i n i o n Gear D e p t h Variance chart.