Spicer Single Drive Axles Service Manual: S135L, S135N, S135S, S150L, S150N, S150S - Manual (Page 42)

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Proper Vehicle Towing
Proper Vehicle Towing
Lift the drive wheels completely off of the ground or damage
will occur.
WARNING: Do not lift the front wheels (non-drive
wheels). This alters the oil’s position in the drive axle,
draining it away from the drive pinion and its bearings.
If the pinion is rotated under these conditions for any
period of time, bearings will overheat resulting in axle
damage or failure.
If it is impossible to lift the drive wheels, remove all axle
shafts to prevent gear rotation and cap the wheel hubs to pre-
vent loss of lubricant and a possible road hazard. See the fol-
lowing section Proper Vehicle Towing with Wheel Differential
Lock for removal procedure.
With Truetrac Limited Slip Differential
These differentials perform like conventional (open) differen-
tials under normal driving conditions - until traction control is
needed. Then the imbalanced gear forces automatically apply
resistance to the wheel (or axle) with the lesser traction.
Planetary pinion gears are supported in pockets of the case.
Each pinion meshes with its side ear and with a mating pinion
of the opposite planetary gear set.
When the vehicle experiences unequal side to side traction
(for instance on wet, muddy, icy or sand/gravel terrain), the
pinions resist rotation in the case and transfer torque from
one side gear to the other. All mating pinions tend to separate
from each other and from the side gears and they wedge into
their case pockets. This provides a friction force that retards
or prevents the wheel with lesser traction from rotating and
spinning out.