The tires on the front and rear of your vehicle operate at different loads and perform different steering, handling, and braking functions. For these reasons, they wear at unequal rates.
These effects can be reduced by timely rotation of tires. The benefits of rotation are especially worthwhile with aggressive tread designs such as those on On/Off Road type tires. Rotation will increase tread life, help to maintain mud, snow, and wet traction levels, and contribute to a smooth, quiet ride.
For the proper maintenance intervals. The reasons for any rapid or unusual wear should be corrected prior to rotation being performed.
The suggested rotation method is the “rearward cross” shown in the following diagram.

Tire Rotation (Rearward Cross)
CAUTION!
Proper operation of four-wheel drive vehicles depends on tires of equal size, type, and circumference on each wheel. Any difference in tire size can cause damage to the transfer case. Tire rotation schedule should be followed to balance tire wear.
Snow Traction Devices
DEPARTMENT OF TRANSPORTATION UNIFORM TIRE QUALITY GRADES