MODEL 60 TRAC-LOK
OPERATION
A c
o
n
v
e
n
t
i
o
n
a
l differential transmits all
of
t
h
e
ri
n
g
ge
ar
t
o
rq
u
e
t
h
r
ou
gh
the differential side gears to
the
axle shafts. Torque is at all times equal on
the
axle
shafts, and if
on
e wheel slips, the
other wheel can
only
put out
as m
u
ch torque as t
he
s
l
i
ppin
g
wheel.
The
Trac·Lok differential is
si
mil
ar
,
except that
part
of
the torque from the ring
gear is transmitted through
c
lu
t
c
h
packs between the
s
i
de
gears
and differential
case. The
m
u
l
ti
ple disc clutches with radial gr
oov
e
s on
the
pl
a
t
es
,
a
n
d c
o
n
c
e
n
tri
c
g
r
o
ov
e
s
o
n
th
e d
i
s
c
s
,
ar
e
e
n
ga
g
e
d
by
a
preload from Belleville S
p
ri
ng
s
, plus
separating forces from
the side gears, as torque is
applied
t
h
r
ou
gh the ring gear.
The
Trac·Lok
c
ons
t
ru
c
t
i
o
n
p
e
r
mi
ts differential ac·
t
i
o
n
,
w
h
e
n
r
eq
u
i
r
ed
,
for
t
ur
n
i
n
g
corners and
t
ra
n
s·
mits equal
t
o
r
q
ue
to both
whe
e
l
s
w
he
n d
r
i
v
in
g
s
t
r
a
i
g
h
t
ahead. However, when
one wheel
tries to
s
pi
n
d
u
e t
o
l
e
a
vi
ng
t
h
e gr
o
u
n
d
,
a patch
of ice,
e
t
c
.
,
t
h
e cl
u
t
c
h
pac
ks
a
uto
ma
ti
c
ally pro
vide
more torque to the wheel
which is not
trying t
o s
p
i
n.
The Trac·Lok differential resists
w
h
ee
l
s
p
i
n on
b
u
mp
y roads and
p
ro
v
i
de
s
more pulling power when
one wheel tries to slip.
In
many
cases of
d
i
ff
e
re
nc
es
in
traction,
p
u
lli
n
g power will be a
ut
o
ma
ti
c
a
ll
y
provided
un
t
i
l
both wheels start to
s
l
i
p
.
I
n
d
i
ag
n
osis
of
v
e
h
icl
e operators'
c
o
m
p
l
ai
n
t
s
,
it is
im
p
o
r
t
a
n
t
to recognize two
t
h
i
n
g
s
:
1.
If,
with
unequal
t
ra
c
t
i
o
n
, b
o
t
h
w
h
ee
ls
sli
p
,
the
Trac·Lok has done all it can p
o
ss
i
b
l
y
do.
2.
In
extreme case�
of d
if
f
e
r
e
n
c
e
s
in t
r
a
c
ti
on,
the
wheel with
the least traction may spin after the
Trac·Lok has transferred as
much
t
o
r
que
as pos·
sible to the non·slipping wheel.
LUBRICATION
It is n
o
t
our intent to
r
e
co
m
me
nd
any particular
brand or
m
a
ke
of lubricant
f
o
r
S
p
i
c
e
r
axles.
However, a S.A.E.
90
wei
gh
t mu
l
t
ipurp
os
e gear
lubricant meeting Mil. Spec. L·2105·B,
or
80
W
90
mu
l
t
ip
u
rpo
se
gear lubricant
m
e
e
t
i
n
g Mil. Spec.
L·2105·C,
a
n
d
suitable for A.
P
.l.
Service Classificia·
tion G
L·5 is suggested as
a
minimum
r
eq
u
ireme
nt
.
nPORTANT
Limited Slip Differentials impose additional re·
Jirements on lu
b
r
i
c
a
n
t
s
which cannot be covered
y
the above specifications. Some ot
h
e
r
w
i
s
e
good
bricants
p
rod
uc
e
"
c
h
att
er
"
o
r
"
b
um
p
i
n
g
" in
turn·
,g
co
rn
e
r
s
with
L
im
i
t
ed
Slip
D
i
ffe
r
e
n
t
i
als
.
Many
lhicle
manufacturers find i
t
n
e
c
e
s
s
a
ry to
s
pec
i
f
y
a
3
special
l
ub
ri
can
t
or
lubricant
additive
for use
with
Limited
Slip Differentials.
Check
t
h
e
vehicle
manufacturer's
l
u
b
ri
ca
nt
re
c
omm
endat
io
n
s
.
COLD WEATHER OPERATION
If the vehicle
is
op
e
r
at
e
d
below 0°F (-I8°C),
i
t is
advisable to use S.A.E.
80
mu
l
t
ipu
r
p
o
s
e
gear
lubri·
cant meeting Mil. Spec.
L·2105·B
and
suitable for
A.P.I. Service
C
l
a
ss
i
f
i
cat
i
o
n
GL·5.
TROUBLE SYMPTOMS AND
POSSIBLE CAUSES
I
f
no
i
s
e
s o
r
r
o
ugh
ne
ss, s
u
c
h
a
s
ch
a
t
t
e
r
,
are present
in
tu
rning c
o
r
n
er
s
,
th
e p
r
o
b
ab
l
e cause is incorrect or
contaminated lubricant. (See Lubrication)
Before any differential is removed and
disas·
se
mb
l
ed f
or
ch
a
t
t
er
co
m
pl
a
ints
,
the correctness of
lubricant
ca
n
an
d
s
h
o
uld
b
e
de
t
e
r
m
ined
.
If the vehicle manufacturer recommends a lubri·
cant
ad
d
iti
v
e
fo
r
c
ha
t
t
e
r c
o
mp
l
a
i
nts, a
d
d
t
h
e
s
p
e
c
i
f
ie
d
type
and
a
m
o
u
n
t
of additive and recheck for chatter
b
y
wa
r
min
g
the axle up, and
t
h
e
n mak
i
n
g a minimum of
t
e
n
(10) figure eight t
u
r
n
s
.
If
t
hi
s is
u
nsuc
c
e
ss
fu
l
,
or no lubricant additive is
specified, a c
o
m
pl
ete
lubricant drain, flush,
and
r
e
fi
ll
with the
s
pe
c
i
f
i
e
d
Limited Slip
Differential lubricant
will
usually correct chatter. The following p
r
o
c
ed
u
r
e
is
re
com
m
e
n
d
ed to ensure
fl
ush
i
n
g
the system o
f
o
l
d
l
u
b
r
i
c
a
n
t
.
I.
Warm the
l
u
b
ricant
b
y
v
e
h
i
c
le
r
o
a
d
o
p
e
r
a
t
i
o
n
or
five (5) minutes
o
f
o
pe
rat
i
on
in gear at 30
m.p.h.
with both rear wheels off
t
h
e gro
u
n
d
on
a hoist.
CAUTION
NEVER PLACE THE TRANSMISSION IN
GEAR WITH THE ENGINE RUNNING WHEN
ONLY ONE WHEEL OF A UMITED SLIP DJF.
FERENTIAL EQUIPPED VEHICLE IS RAIS·
ED.
THE VEHICLE MIGHT DRIVE ITSELF
OFF THE JACK AND CAUSE DAMAGE OR
INJURY.
2.
Drain
lubricant while warm. Remove drain
p
l
u
g
or c
o
v
e
r
plate
t
o
d
r
a
i
n
c
o
mple
t
ely
.
If c
o
v
er plate
is
removed, it
may
be
n
e
ce
ss
ar
y to
r
e
p
l
a
ce
ga
s
k
e
t
at this time.
3.
Refill axle
with
s
p
e
ci
f
i
ed
Limited Slip
D
iffer
e
n
·
t
ia
l l
u
b
ri
can
t
.
4.
O
perat
e
the vehicle for approximately ten (10)
miles,
m
ak
in
g at least
ten (10)
f
i
gu
r
e
8
t
u
rns
to
flush the old lubricant out of the
c
l
utc
h
p
a
c
k
s.
