Spicer Tandem Drive Axles Pro-40 Single Reduction and Single Reduction with Differential Lock - Manual (Page 88)

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Proper Vehicle Towing
Proper
Vehicle
Towing
Proper Vehicle Towing
Without Wheel Differential Lock
Lift the drive wheels completely off of the ground or damage
will occur.
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 this is impossible to lift the drive wheels, remove all axle
shafts to prevent gear rotation and cap the wheel hubs to prevent
loss of lubricant and a possible road hazard. See the following
section Proper Vehicle Towing with Wheel Differential
Lock for removal procedure.
WARNING