Table of Contents
Advertisement
SURE-GRIP/TRAC-LOK DIFFERENTIALS
W h e n the " o n - v e h i c l e " ( d y n a m i c ) r e a r wheel/
tire b a l a n c e m e t h o d i s e m p l o y e d for v e h i c l e s
e q u i p p e d w i t h a S u r e - G r i p o r T r a c - L o k differen-
tial, r a i s e b o t h r e a r wheels/tires off the s u r f a c e
a n d remove the wheel/tire t h a t i s not b e i n g b a l -
a n c e d .
B o t h front wheels/tires m u s t be securely blocked t o
prevent any vehicle movement.
CAUTION: Do not exceed 35 mph (56 km/h) for
Sure-Grip or Trac-Lok differentials.
W h e n employing rear wheel/tire balance o f t h i s
type ( w i t h the rear wheels/tires off the surface), a 35
m p h (56 km/h) speedometer i n d i c a t i o n represents a
70 m p h (113 km/h) rear wheel r o t a t i o n a l speed. A
speed o f 35 m p h (56 km/h) (speedometer indication)
is t h e m a x i m u m necessary for dynamic wheel/tire
balance.
W h e n the wheel/tire is satisfactorily balanced, i n -
s t a l l t h e unbalanced wheel/tire (tighten t h e wheel
l u g n u t s w i t h t h e specified torque) and balance i t
w i t h t h e same "on-vehicle" method. I t is not neces-
sary t o remove the balanced wheel/tire.
For
a d d i t i o n a l
i n f o r m a t i o n ,
refer
t o
Group
2 2 — T i r e s A n d Wheels, and the instructions supplied
b y the manufacturer o f the balancing equipment be-
i n g used.
8 3/8- AND 9 1/4-INCH DIAMETER RING G E A R A X L E S E R V I C E
INDEX
Page
Axle Shaft, Seal and Bearing Service
12
Complete Axle Removal/Installation
16
Drive Pinion Gear Shaft Seal Replacement
14
Lubricants
32
Page
Service Information
9
Standard Differential Service
16
Sure-Grip Differential Service
. 30
SERVICE INFORMATION
The rear axle housings for axles w i t h an 8 3/8- or a
9 1/4-inch diameter r i n g gear (Fig. 1, F i g . 2) consist
of a n iron center casting (differential housing) w i t h
axle shaft tubes extending f r o m either side. The axle
shaft tubes are pressed i n t o a n d welded to t h e differ-
e n t i a l housing to f o r m a one-piece axle housing. B o t h
axles have a h y p o i d gear d i f f e r e n t i a l and the center-
l i n e of the d r i v e p i n i o n gear shaft is located below
t h e centerline o f t h e r i n g
gear. The removable,
stamped steel cover located a t t h e rear o f the differ-
e n t i a l housing provides a means for inspection and
for differential service w i t h o u t removing t h e com-
plete rear axle f r o m t h e vehicle.
A small, stamped m e t a l axle gear ratio identifica-
t i o n t a g is attached t o t h e h o u s i n g cover v i a one of
t h e cover bolts.
The drive p i n i o n gear shaft rotates w i t h i n two t a -
pered roller bearings (Fig. 1, F i g . 2). The drive p i n -
i o n gear shaft front a n d rear bearings are "press-
f i t t e d " on t h e drive p i n i o n gear shaft. T h e drive
p i n i o n gear shaft f r o n t and r e a r bearing cups are
"press-fitted" i n t h e d i f f e r e n t i a l housing bore a n d
against a recessed shoulder. T h e drive p i n i o n gear
shaft depth o f mesh adjustment is controlled b y the
use o f m e t a l depth shims t h a t are installed between
t h e d r i v e p i n i o n gear shaft rear bearing a n d t h e
d r i v e p i n i o n gear.
The
drive p i n i o n gear shaft bearing
" p r e l o a d "
torque is provided v i a a metal, collapsible spacer t h a t
is located between t h e drive p i n i o n gear shaft f r o n t
a n d rear bearings (Fig. 1, Fig. 2). The spacer i s com-
pressed (i.e., collapsed) by t i g h t e n i n g the drive p i n i o n
gear shaft (axle) yoke n u t u n t i l the specified "pre-
l o a d " torque i s obtained.
The one-piece differential case contains t w o side
gears, t w o p i n i o n gears and two pairs of t h r u s t wash-
ers (Fig. 1, F i g . 2). The side gears rotate i n machined
counterbores i n the differential case and have i n t e r -
n a l splines t h a t " m e s h " w i t h (and drive) t h e axle
shafts. The p i n i o n gears have a smooth surface a n d
are h e l d i n place b y a solid p i n i o n mate gear shaft
t h a t is inserted i n t o a n d then "locked" i n the differ-
e n t i a l case b y means o f a lock screw. A l l four gears
are "meshed" w i t h each other and, because t h e y ro-
t a t e freely on the p i n i o n mate gear shaft, t h e p i n i o n
gears f u n c t i o n as i d l e r gears when the rear wheels
are r o t a t i n g at different speeds (e.g., d u r i n g a vehicle
t u r n ) .
The differential case hubs rotate i n the differential
h o u s i n g v i a t w o tapered roller bearings t h a t are
Advertisement
Table of Contents
