Ford 1996 Aerostar Manual page 275

Traction-Lok Rear Axle (If equipped)
This axle provides added drive away traction on
slippery surfaces, particularly when one or more
wheels are on a surface with poor traction.
To avoid injury, never run the engine
with one wheel off the ground, such as
when changing a tire.
Tire Rotation
Because your vehicle's front and rear tires
perform different jobs, they often wear
differently. To make sure your tires wear evenly
and last longer, rotate them at the mileage
shown in the Maintenance Schedule and Record
booklet which came with your vehicle.
Rotate the tires according to the following
diagram. If you notice that the tires wear
unevenly, have them checked. If your light truck
has a temporary spare tire, do not include it in
the tire rotation pattern.
In situations where the tires differ from front to
rear (snow/traction), simply rotate using a side
to side pattern.
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